cregit-Linux how code gets into the kernel

Release 4.11 mm/mempolicy.c

Directory: mm
/*
 * Simple NUMA memory policy for the Linux kernel.
 *
 * Copyright 2003,2004 Andi Kleen, SuSE Labs.
 * (C) Copyright 2005 Christoph Lameter, Silicon Graphics, Inc.
 * Subject to the GNU Public License, version 2.
 *
 * NUMA policy allows the user to give hints in which node(s) memory should
 * be allocated.
 *
 * Support four policies per VMA and per process:
 *
 * The VMA policy has priority over the process policy for a page fault.
 *
 * interleave     Allocate memory interleaved over a set of nodes,
 *                with normal fallback if it fails.
 *                For VMA based allocations this interleaves based on the
 *                offset into the backing object or offset into the mapping
 *                for anonymous memory. For process policy an process counter
 *                is used.
 *
 * bind           Only allocate memory on a specific set of nodes,
 *                no fallback.
 *                FIXME: memory is allocated starting with the first node
 *                to the last. It would be better if bind would truly restrict
 *                the allocation to memory nodes instead
 *
 * preferred       Try a specific node first before normal fallback.
 *                As a special case NUMA_NO_NODE here means do the allocation
 *                on the local CPU. This is normally identical to default,
 *                but useful to set in a VMA when you have a non default
 *                process policy.
 *
 * default        Allocate on the local node first, or when on a VMA
 *                use the process policy. This is what Linux always did
 *                in a NUMA aware kernel and still does by, ahem, default.
 *
 * The process policy is applied for most non interrupt memory allocations
 * in that process' context. Interrupts ignore the policies and always
 * try to allocate on the local CPU. The VMA policy is only applied for memory
 * allocations for a VMA in the VM.
 *
 * Currently there are a few corner cases in swapping where the policy
 * is not applied, but the majority should be handled. When process policy
 * is used it is not remembered over swap outs/swap ins.
 *
 * Only the highest zone in the zone hierarchy gets policied. Allocations
 * requesting a lower zone just use default policy. This implies that
 * on systems with highmem kernel lowmem allocation don't get policied.
 * Same with GFP_DMA allocations.
 *
 * For shmfs/tmpfs/hugetlbfs shared memory the policy is shared between
 * all users and remembered even when nobody has memory mapped.
 */

/* Notebook:
   fix mmap readahead to honour policy and enable policy for any page cache
   object
   statistics for bigpages
   global policy for page cache? currently it uses process policy. Requires
   first item above.
   handle mremap for shared memory (currently ignored for the policy)
   grows down?
   make bind policy root only? It can trigger oom much faster and the
   kernel is not always grateful with that.
*/


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/mempolicy.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/hugetlb.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/numa_balancing.h>
#include <linux/sched/task.h>
#include <linux/nodemask.h>
#include <linux/cpuset.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/export.h>
#include <linux/nsproxy.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/compat.h>
#include <linux/swap.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/migrate.h>
#include <linux/ksm.h>
#include <linux/rmap.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/ctype.h>
#include <linux/mm_inline.h>
#include <linux/mmu_notifier.h>
#include <linux/printk.h>

#include <asm/tlbflush.h>
#include <linux/uaccess.h>

#include "internal.h"

/* Internal flags */

#define MPOL_MF_DISCONTIG_OK (MPOL_MF_INTERNAL << 0)	
/* Skip checks for continuous vmas */

#define MPOL_MF_INVERT (MPOL_MF_INTERNAL << 1)		
/* Invert check for nodemask */


static struct kmem_cache *policy_cache;

static struct kmem_cache *sn_cache;

/* Highest zone. An specific allocation for a zone below that is not
   policied. */

enum zone_type policy_zone = 0;

/*
 * run-time system-wide default policy => local allocation
 */

static struct mempolicy default_policy = {
	.refcnt = ATOMIC_INIT(1), /* never free it */
	.mode = MPOL_PREFERRED,
	.flags = MPOL_F_LOCAL,
};


static struct mempolicy preferred_node_policy[MAX_NUMNODES];


struct mempolicy *get_task_policy(struct task_struct *p) { struct mempolicy *pol = p->mempolicy; int node; if (pol) return pol; node = numa_node_id(); if (node != NUMA_NO_NODE) { pol = &preferred_node_policy[node]; /* preferred_node_policy is not initialised early in boot */ if (pol->mode) return pol; } return &default_policy; }

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Mel Gorman5075.76%125.00%
Oleg Nesterov1319.70%125.00%
Jianguo Wu23.03%125.00%
David Rientjes11.52%125.00%
Total66100.00%4100.00%

static const struct mempolicy_operations { int (*create)(struct mempolicy *pol, const nodemask_t *nodes); /* * If read-side task has no lock to protect task->mempolicy, write-side * task will rebind the task->mempolicy by two step. The first step is * setting all the newly nodes, and the second step is cleaning all the * disallowed nodes. In this way, we can avoid finding no node to alloc * page. * If we have a lock to protect task->mempolicy in read-side, we do * rebind directly. * * step: * MPOL_REBIND_ONCE - do rebind work at once * MPOL_REBIND_STEP1 - set all the newly nodes * MPOL_REBIND_STEP2 - clean all the disallowed nodes */ void (*rebind)(struct mempolicy *pol, const nodemask_t *nodes, enum mpol_rebind_step step); } mpol_ops[MPOL_MAX];
static inline int mpol_store_user_nodemask(const struct mempolicy *pol) { return pol->flags & MPOL_MODE_FLAGS; }

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David Rientjes1995.00%150.00%
Bob Liu15.00%150.00%
Total20100.00%2100.00%


static void mpol_relative_nodemask(nodemask_t *ret, const nodemask_t *orig, const nodemask_t *rel) { nodemask_t tmp; nodes_fold(tmp, *orig, nodes_weight(*rel)); nodes_onto(*ret, tmp, *rel); }

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David Rientjes48100.00%1100.00%
Total48100.00%1100.00%


static int mpol_new_interleave(struct mempolicy *pol, const nodemask_t *nodes) { if (nodes_empty(*nodes)) return -EINVAL; pol->v.nodes = *nodes; return 0; }

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David Rientjes40100.00%1100.00%
Total40100.00%1100.00%


static int mpol_new_preferred(struct mempolicy *pol, const nodemask_t *nodes) { if (!nodes) pol->flags |= MPOL_F_LOCAL; /* local allocation */ else if (nodes_empty(*nodes)) return -EINVAL; /* no allowed nodes */ else pol->v.preferred_node = first_node(*nodes); return 0; }

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David Rientjes5594.83%150.00%
Lee Schermerhorn35.17%150.00%
Total58100.00%2100.00%


static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes) { if (nodes_empty(*nodes)) return -EINVAL; pol->v.nodes = *nodes; return 0; }

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David Rientjes3895.00%150.00%
Zhihui Zhang25.00%150.00%
Total40100.00%2100.00%

/* * mpol_set_nodemask is called after mpol_new() to set up the nodemask, if * any, for the new policy. mpol_new() has already validated the nodes * parameter with respect to the policy mode and flags. But, we need to * handle an empty nodemask with MPOL_PREFERRED here. * * Must be called holding task's alloc_lock to protect task's mems_allowed * and mempolicy. May also be called holding the mmap_semaphore for write. */
static int mpol_set_nodemask(struct mempolicy *pol, const nodemask_t *nodes, struct nodemask_scratch *nsc) { int ret; /* if mode is MPOL_DEFAULT, pol is NULL. This is right. */ if (pol == NULL) return 0; /* Check N_MEMORY */ nodes_and(nsc->mask1, cpuset_current_mems_allowed, node_states[N_MEMORY]); VM_BUG_ON(!nodes); if (pol->mode == MPOL_PREFERRED && nodes_empty(*nodes)) nodes = NULL; /* explicit local allocation */ else { if (pol->flags & MPOL_F_RELATIVE_NODES) mpol_relative_nodemask(&nsc->mask2, nodes, &nsc->mask1); else nodes_and(nsc->mask2, *nodes, nsc->mask1); if (mpol_store_user_nodemask(pol)) pol->w.user_nodemask = *nodes; else pol->w.cpuset_mems_allowed = cpuset_current_mems_allowed; } if (nodes) ret = mpol_ops[pol->mode].create(pol, &nsc->mask2); else ret = mpol_ops[pol->mode].create(pol, NULL); return ret; }

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Miao Xie12869.95%133.33%
Kamezawa Hiroyuki5328.96%133.33%
Lai Jiangshan21.09%133.33%
Total183100.00%3100.00%

/* * This function just creates a new policy, does some check and simple * initialization. You must invoke mpol_set_nodemask() to set nodes. */
static struct mempolicy *mpol_new(unsigned short mode, unsigned short flags, nodemask_t *nodes) { struct mempolicy *policy; pr_debug("setting mode %d flags %d nodes[0] %lx\n", mode, flags, nodes ? nodes_addr(*nodes)[0] : NUMA_NO_NODE); if (mode == MPOL_DEFAULT) { if (nodes && !nodes_empty(*nodes)) return ERR_PTR(-EINVAL); return NULL; } VM_BUG_ON(!nodes); /* * MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or * MPOL_F_RELATIVE_NODES if the nodemask is empty (local allocation). * All other modes require a valid pointer to a non-empty nodemask. */ if (mode == MPOL_PREFERRED) { if (nodes_empty(*nodes)) { if (((flags & MPOL_F_STATIC_NODES) || (flags & MPOL_F_RELATIVE_NODES))) return ERR_PTR(-EINVAL); } } else if (mode == MPOL_LOCAL) { if (!nodes_empty(*nodes) || (flags & MPOL_F_STATIC_NODES) || (flags & MPOL_F_RELATIVE_NODES)) return ERR_PTR(-EINVAL); mode = MPOL_PREFERRED; } else if (nodes_empty(*nodes)) return ERR_PTR(-EINVAL); policy = kmem_cache_alloc(policy_cache, GFP_KERNEL); if (!policy) return ERR_PTR(-ENOMEM); atomic_set(&policy->refcnt, 1); policy->mode = mode; policy->flags = flags; return policy; }

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PersonTokensPropCommitsCommitProp
David Rientjes11048.46%650.00%
Andrew Morton6629.07%18.33%
Peter Zijlstra2912.78%18.33%
Piotr Kwapulinski125.29%18.33%
Andi Kleen52.20%18.33%
Paul Mundt41.76%18.33%
Lee Schermerhorn10.44%18.33%
Total227100.00%12100.00%

/* Slow path of a mpol destructor. */
void __mpol_put(struct mempolicy *p) { if (!atomic_dec_and_test(&p->refcnt)) return; kmem_cache_free(policy_cache, p); }

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Lee Schermerhorn29100.00%1100.00%
Total29100.00%1100.00%


static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes, enum mpol_rebind_step step) { }

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David Rientjes736.84%225.00%
Andrew Morton421.05%112.50%
Miao Xie421.05%112.50%
Andi Kleen210.53%225.00%
Christoph Lameter15.26%112.50%
Hugh Dickins15.26%112.50%
Total19100.00%8100.00%

/* * step: * MPOL_REBIND_ONCE - do rebind work at once * MPOL_REBIND_STEP1 - set all the newly nodes * MPOL_REBIND_STEP2 - clean all the disallowed nodes */
static void mpol_rebind_nodemask(struct mempolicy *pol, const nodemask_t *nodes, enum mpol_rebind_step step) { nodemask_t tmp; if (pol->flags & MPOL_F_STATIC_NODES) nodes_and(tmp, pol->w.user_nodemask, *nodes); else if (pol->flags & MPOL_F_RELATIVE_NODES) mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); else { /* * if step == 1, we use ->w.cpuset_mems_allowed to cache the * result */ if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP1) { nodes_remap(tmp, pol->v.nodes, pol->w.cpuset_mems_allowed, *nodes); pol->w.cpuset_mems_allowed = step ? tmp : *nodes; } else if (step == MPOL_REBIND_STEP2) { tmp = pol->w.cpuset_mems_allowed; pol->w.cpuset_mems_allowed = *nodes; } else BUG(); } if (nodes_empty(tmp)) tmp = *nodes; if (step == MPOL_REBIND_STEP1) nodes_or(pol->v.nodes, pol->v.nodes, tmp); else if (step == MPOL_REBIND_ONCE || step == MPOL_REBIND_STEP2) pol->v.nodes = tmp; else BUG(); if (!node_isset(current->il_next, tmp)) { current->il_next = next_node_in(current->il_next, tmp); if (current->il_next >= MAX_NUMNODES) current->il_next = numa_node_id(); } }

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David Rientjes12952.02%220.00%
Miao Xie10140.73%110.00%
Christoph Lameter124.84%330.00%
Andrew Morton31.21%220.00%
Andi Kleen20.81%110.00%
Hugh Dickins10.40%110.00%
Total248100.00%10100.00%


static void mpol_rebind_preferred(struct mempolicy *pol, const nodemask_t *nodes, enum mpol_rebind_step step) { nodemask_t tmp; if (pol->flags & MPOL_F_STATIC_NODES) { int node = first_node(pol->w.user_nodemask); if (node_isset(node, *nodes)) { pol->v.preferred_node = node; pol->flags &= ~MPOL_F_LOCAL; } else pol->flags |= MPOL_F_LOCAL; } else if (pol->flags & MPOL_F_RELATIVE_NODES) { mpol_relative_nodemask(&tmp, &pol->w.user_nodemask, nodes); pol->v.preferred_node = first_node(tmp); } else if (!(pol->flags & MPOL_F_LOCAL)) { pol->v.preferred_node = node_remap(pol->v.preferred_node, pol->w.cpuset_mems_allowed, *nodes); pol->w.cpuset_mems_allowed = *nodes; } }

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David Rientjes14186.50%360.00%
Lee Schermerhorn1811.04%120.00%
Miao Xie42.45%120.00%
Total163100.00%5100.00%

/* * mpol_rebind_policy - Migrate a policy to a different set of nodes * * If read-side task has no lock to protect task->mempolicy, write-side * task will rebind the task->mempolicy by two step. The first step is * setting all the newly nodes, and the second step is cleaning all the * disallowed nodes. In this way, we can avoid finding no node to alloc * page. * If we have a lock to protect task->mempolicy in read-side, we do * rebind directly. * * step: * MPOL_REBIND_ONCE - do rebind work at once * MPOL_REBIND_STEP1 - set all the newly nodes * MPOL_REBIND_STEP2 - clean all the disallowed nodes */
static void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask, enum mpol_rebind_step step) { if (!pol) return; if (!mpol_store_user_nodemask(pol) && step == MPOL_REBIND_ONCE && nodes_equal(pol->w.cpuset_mems_allowed, *newmask)) return; if (step == MPOL_REBIND_STEP1 && (pol->flags & MPOL_F_REBINDING)) return; if (step == MPOL_REBIND_STEP2 && !(pol->flags & MPOL_F_REBINDING)) BUG(); if (step == MPOL_REBIND_STEP1) pol->flags |= MPOL_F_REBINDING; else if (step == MPOL_REBIND_STEP2) pol->flags &= ~MPOL_F_REBINDING; else if (step >= MPOL_REBIND_NSTEP) BUG(); mpol_ops[pol->mode].rebind(pol, newmask, step); }

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PersonTokensPropCommitsCommitProp
Miao Xie7857.35%120.00%
David Rientjes5641.18%240.00%
Wang Sheng-Hui10.74%120.00%
Lee Schermerhorn10.74%120.00%
Total136100.00%5100.00%

/* * Wrapper for mpol_rebind_policy() that just requires task * pointer, and updates task mempolicy. * * Called with task's alloc_lock held. */
void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new, enum mpol_rebind_step step) { mpol_rebind_policy(tsk->mempolicy, new, step); }

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David Rientjes2480.00%150.00%
Miao Xie620.00%150.00%
Total30100.00%2100.00%

/* * Rebind each vma in mm to new nodemask. * * Call holding a reference to mm. Takes mm->mmap_sem during call. */
void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new) { struct vm_area_struct *vma; down_write(&mm->mmap_sem); for (vma = mm->mmap; vma; vma = vma->vm_next) mpol_rebind_policy(vma->vm_policy, new, MPOL_REBIND_ONCE); up_write(&mm->mmap_sem); }

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David Rientjes6096.77%150.00%
Miao Xie23.23%150.00%
Total62100.00%2100.00%

static const struct mempolicy_operations mpol_ops[MPOL_MAX] = { [MPOL_DEFAULT] = { .rebind = mpol_rebind_default, }, [MPOL_INTERLEAVE] = { .create = mpol_new_interleave, .rebind = mpol_rebind_nodemask, }, [MPOL_PREFERRED] = { .create = mpol_new_preferred, .rebind = mpol_rebind_preferred, }, [MPOL_BIND] = { .create = mpol_new_bind, .rebind = mpol_rebind_nodemask, }, }; static void migrate_page_add(struct page *page, struct list_head *pagelist, unsigned long flags); struct queue_pages { struct list_head *pagelist; unsigned long flags; nodemask_t *nmask; struct vm_area_struct *prev; }; /* * Scan through pages checking if pages follow certain conditions, * and move them to the pagelist if they do. */
static int queue_pages_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, struct mm_walk *walk) { struct vm_area_struct *vma = walk->vma; struct page *page; struct queue_pages *qp = walk->private; unsigned long flags = qp->flags; int nid, ret; pte_t *pte; spinlock_t *ptl; if (pmd_trans_huge(*pmd)) { ptl = pmd_lock(walk->mm, pmd); if (pmd_trans_huge(*pmd)) { page = pmd_page(*pmd); if (is_huge_zero_page(page)) { spin_unlock(ptl); __split_huge_pmd(vma, pmd, addr, false, NULL); } else { get_page(page); spin_unlock(ptl); lock_page(page); ret = split_huge_page(page); unlock_page(page); put_page(page); if (ret) return 0; } } else { spin_unlock(ptl); } } if (pmd_trans_unstable(pmd)) return 0; retry: pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); for (; addr != end; pte++, addr += PAGE_SIZE) { if (!pte_present(*pte)) continue; page = vm_normal_page(vma, addr, *pte); if (!page) continue; /* * vm_normal_page() filters out zero pages, but there might * still be PageReserved pages to skip, perhaps in a VDSO. */ if (PageReserved(page)) continue; nid = page_to_nid(page); if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) continue; if (PageTransCompound(page)) { get_page(page); pte_unmap_unlock(pte, ptl); lock_page(page); ret = split_huge_page(page); unlock_page(page); put_page(page); /* Failed to split -- skip. */ if (ret) { pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); continue; } goto retry; } migrate_page_add(page, qp->pagelist, flags); } pte_unmap_unlock(pte - 1, ptl); cond_resched(); return 0; }

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PersonTokensPropCommitsCommitProp
Kirill A. Shutemov17144.07%321.43%
David Rientjes11329.12%214.29%
Naoya Horiguchi8722.42%321.43%
Hugh Dickins112.84%428.57%
Christoph Lameter41.03%17.14%
Andrew Morton20.52%17.14%
Total388100.00%14100.00%


static int queue_pages_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr, unsigned long end, struct mm_walk *walk) { #ifdef CONFIG_HUGETLB_PAGE struct queue_pages *qp = walk->private; unsigned long flags = qp->flags; int nid; struct page *page; spinlock_t *ptl; pte_t entry; ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte); entry = huge_ptep_get(pte); if (!pte_present(entry)) goto unlock; page = pte_page(entry); nid = page_to_nid(page); if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) goto unlock; /* With MPOL_MF_MOVE, we migrate only unshared hugepage. */ if (flags & (MPOL_MF_MOVE_ALL) || (flags & MPOL_MF_MOVE && page_mapcount(page) == 1)) isolate_huge_page(page, qp->pagelist); unlock: spin_unlock(ptl); #else BUG(); #endif return 0; }

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Naoya Horiguchi16992.35%375.00%
Kirill A. Shutemov147.65%125.00%
Total183100.00%4100.00%

#ifdef CONFIG_NUMA_BALANCING /* * This is used to mark a range of virtual addresses to be inaccessible. * These are later cleared by a NUMA hinting fault. Depending on these * faults, pages may be migrated for better NUMA placement. * * This is assuming that NUMA faults are handled using PROT_NONE. If * an architecture makes a different choice, it will need further * changes to the core. */
unsigned long change_prot_numa(struct vm_area_struct *vma, unsigned long addr, unsigned long end) { int nr_updated; nr_updated = change_protection(vma, addr, end, PAGE_NONE, 0, 1); if (nr_updated) count_vm_numa_events(NUMA_PTE_UPDATES, nr_updated); return nr_updated; }

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Hugh Dickins1630.19%112.50%
Mel Gorman1528.30%337.50%
Naoya Horiguchi1324.53%112.50%
Andrew Morton59.43%112.50%
Lee Schermerhorn23.77%112.50%
Nicholas Piggin23.77%112.50%
Total53100.00%8100.00%

#else
static unsigned long change_prot_numa(struct vm_area_struct *vma, unsigned long addr, unsigned long end) { return 0; }

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Lee Schermerhorn1773.91%133.33%
Hugh Dickins313.04%133.33%
Andrew Morton313.04%133.33%
Total23100.00%3100.00%

#endif /* CONFIG_NUMA_BALANCING */
static int queue_pages_test_walk(unsigned long start, unsigned long end, struct mm_walk *walk) { struct vm_area_struct *vma = walk->vma; struct queue_pages *qp = walk->private; unsigned long endvma = vma->vm_end; unsigned long flags = qp->flags; if (!vma_migratable(vma)) return 1; if (endvma > end) endvma = end; if (vma->vm_start > start) start = vma->vm_start; if (!(flags & MPOL_MF_DISCONTIG_OK)) { if (!vma->vm_next && vma->vm_end < end) return -EFAULT; if (qp->prev && qp->prev->vm_end < vma->vm_start) return -EFAULT; } qp->prev = vma; if (flags & MPOL_MF_LAZY) { /* Similar to task_numa_work, skip inaccessible VMAs */ if (!is_vm_hugetlb_page(vma) && (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)) && !(vma->vm_flags & VM_MIXEDMAP)) change_prot_numa(vma, start, endvma); return 1; } /* queue pages from current vma */ if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) return 0; return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton5425.59%110.00%
Naoya Horiguchi5224.64%220.00%
Lee Schermerhorn4018.96%110.00%
Christoph Lameter219.95%110.00%
Liang Chen178.06%110.00%
Mel Gorman157.11%110.00%
Andi Kleen62.84%110.00%
Kirill A. Shutemov52.37%110.00%
Hugh Dickins10.47%110.00%
Total211100.00%10100.00%

/* * Walk through page tables and collect pages to be migrated. * * If pages found in a given range are on a set of nodes (determined by * @nodes and @flags,) it's isolated and queued to the pagelist which is * passed via @private.) */
static int queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end, nodemask_t *nodes, unsigned long flags, struct list_head *pagelist) { struct queue_pages qp = { .pagelist = pagelist, .flags = flags, .nmask = nodes, .prev = NULL, }; struct mm_walk queue_pages_walk = { .hugetlb_entry = queue_pages_hugetlb, .pmd_entry = queue_pages_pte_range, .test_walk = queue_pages_test_walk, .mm = mm, .private = &qp, }; return walk_page_range(start, end, &queue_pages_walk); }

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Naoya Horiguchi9291.09%125.00%
Andrew Morton76.93%125.00%
Christoph Lameter10.99%125.00%
Andi Kleen10.99%125.00%
Total101100.00%4100.00%

/* * Apply policy to a single VMA * This must be called with the mmap_sem held for writing. */
static int vma_replace_policy(struct vm_area_struct *vma, struct mempolicy *pol) { int err; struct mempolicy *old; struct mempolicy *new; pr_debug("vma %lx-%lx/%lx vm_ops %p vm_file %p set_policy %p\n", vma->vm_start, vma->vm_end, vma->vm_pgoff, vma->vm_ops, vma->vm_file, vma->vm_ops ? vma->vm_ops->set_policy : NULL); new = mpol_dup(pol); if (IS_ERR(new)) return PTR_ERR(new); if (vma->vm_ops && vma->vm_ops->set_policy) { err = vma->vm_ops->set_policy(vma, new); if (err) goto err_out; } old = vma->vm_policy; vma->vm_policy = new; /* protected by mmap_sem */ mpol_put(old); return 0; err_out: mpol_put(new); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki151100.00%2100.00%
Total151100.00%2100.00%

/* Step 2: apply policy to a range and do splits. */
static int mbind_range(struct mm_struct *mm, unsigned long start, unsigned long end, struct mempolicy *new_pol) { struct vm_area_struct *next; struct vm_area_struct *prev; struct vm_area_struct *vma; int err = 0; pgoff_t pgoff; unsigned long vmstart; unsigned long vmend; vma = find_vma(mm, start); if (!vma || vma->vm_start > start) return -EFAULT; prev = vma->vm_prev; if (start > vma->vm_start) prev = vma; for (; vma && vma->vm_start < end; prev = vma, vma = next) { next = vma->vm_next; vmstart = max(start, vma->vm_start); vmend = min(end, vma->vm_end); if (mpol_equal(vma_policy(vma), new_pol)) continue; pgoff = vma->vm_pgoff + ((vmstart - vma->vm_start) >> PAGE_SHIFT); prev = vma_merge(mm, prev, vmstart, vmend, vma->vm_flags, vma->anon_vma, vma->vm_file, pgoff, new_pol, vma->vm_userfaultfd_ctx); if (prev) { vma = prev; next = vma->vm_next; if (mpol_equal(vma_policy(vma), new_pol)) continue; /* vma_merge() joined vma && vma->next, case 8 */ goto replace; } if (vma->vm_start != vmstart) { err = split_vma(vma->vm_mm, vma, vmstart, 1); if (err) goto out; } if (vma->vm_end != vmend) { err = split_vma(vma->vm_mm, vma, vmend, 0); if (err) goto out; } replace: err = vma_replace_policy(vma, new_pol); if (err) goto out; } out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki18856.97%337.50%
Andrew Morton11334.24%225.00%
Oleg Nesterov185.45%112.50%
Linus Torvalds72.12%112.50%
Andrea Arcangeli41.21%112.50%
Total330100.00%8100.00%

/* Set the process memory policy */
static long do_set_mempolicy(unsigned short mode, unsigned short flags, nodemask_t *nodes) { struct mempolicy *new, *old; NODEMASK_SCRATCH(scratch); int ret; if (!scratch) return -ENOMEM; new = mpol_new(mode, flags, nodes); if (IS_ERR(new)) { ret = PTR_ERR(new); goto out; } task_lock(current); ret = mpol_set_nodemask(new, nodes, scratch); if (ret) { task_unlock(current); mpol_put(new); goto out; } old = current->mempolicy; current->mempolicy = new; if (new && new->mode == MPOL_INTERLEAVE && nodes_weight(new->v.nodes)) current->il_next = first_node(new->v.nodes); task_unlock(current); mpol_put(old); ret = 0; out: NODEMASK_SCRATCH_FREE(scratch); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter7140.34%220.00%
Miao Xie4626.14%110.00%
Kamezawa Hiroyuki3922.16%110.00%
David Rientjes179.66%330.00%
Lee Schermerhorn21.14%220.00%
Adrian Bunk10.57%110.00%
Total176100.00%10100.00%

/* * Return nodemask for policy for get_mempolicy() query * * Called with task's alloc_lock held */
static void get_policy_nodemask(struct mempolicy *p, nodemask_t *nodes) { nodes_clear(*nodes); if (p == &default_policy) return; switch (p->mode) { case MPOL_BIND: /* Fall through */ case MPOL_INTERLEAVE: *nodes = p->v.nodes; break; case MPOL_PREFERRED: if (!(p->flags & MPOL_F_LOCAL)) node_set(p->v.preferred_node, *nodes); /* else return empty node mask for local allocation */ break; default: BUG(); } }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter6777.91%116.67%
Lee Schermerhorn1719.77%466.67%
Mel Gorman22.33%116.67%
Total86100.00%6100.00%


static int lookup_node(unsigned long addr) { struct page *p; int err; err = get_user_pages(addr & PAGE_MASK, 1, 0, &p, NULL); if (err >= 0) { err = page_to_nid(p); put_page(p); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter59100.00%2100.00%
Total59100.00%2100.00%

/* Retrieve NUMA policy */
static long do_get_mempolicy(int *policy, nodemask_t *nmask, unsigned long addr, unsigned long flags) { int err; struct mm_struct *mm = current->mm; struct vm_area_struct *vma = NULL; struct mempolicy *pol = current->mempolicy; if (flags & ~(unsigned long)(MPOL_F_NODE|MPOL_F_ADDR|MPOL_F_MEMS_ALLOWED)) return -EINVAL; if (flags & MPOL_F_MEMS_ALLOWED) { if (flags & (MPOL_F_NODE|MPOL_F_ADDR)) return -EINVAL; *policy = 0; /* just so it's initialized */ task_lock(current); *nmask = cpuset_current_mems_allowed; task_unlock(current); return 0; } if (flags & MPOL_F_ADDR) { /* * Do NOT fall back to task policy if the * vma/shared policy at addr is NULL. We * want to return MPOL_DEFAULT in this case. */ down_read(&mm->mmap_sem); vma = find_vma_intersection(mm, addr, addr+1); if (!vma) { up_read(&mm->mmap_sem); return -EFAULT; } if (vma->vm_ops && vma->vm_ops->get_policy) pol = vma->vm_ops->get_policy(vma, addr); else pol = vma->vm_policy; } else if (addr) return -EINVAL; if (!pol) pol = &default_policy; /* indicates default behavior */ if (flags & MPOL_F_NODE) { if (flags & MPOL_F_ADDR) { err = lookup_node(addr); if (err < 0) goto out; *policy = err; } else if (pol == current->mempolicy && pol->mode == MPOL_INTERLEAVE) { *policy = current->il_next; } else { err = -EINVAL; goto out; } } else { *policy = pol == &default_policy ? MPOL_DEFAULT : pol->mode; /* * Internal mempolicy flags must be masked off before exposing * the policy to userspace. */ *policy |= (pol->flags & MPOL_MODE_FLAGS); } if (vma) { up_read(&current->mm->mmap_sem); vma = NULL; } err = 0; if (nmask) { if (mpol_store_user_nodemask(pol)) { *nmask = pol->w.user_nodemask; } else { task_lock(current); get_policy_nodemask(pol, nmask); task_unlock(current); } } out: mpol_cond_put(pol); if (vma) up_read(&current->mm->mmap_sem); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter22153.77%323.08%
Lee Schermerhorn8219.95%538.46%
Andrew Morton7718.73%17.69%
Miao Xie225.35%17.69%
David Rientjes81.95%215.38%
Adrian Bunk10.24%17.69%
Total411100.00%13100.00%

#ifdef CONFIG_MIGRATION /* * page migration */
static void migrate_page_add(struct page *page, struct list_head *pagelist, unsigned long flags) { /* * Avoid migrating a page that is shared with others. */ if ((flags & MPOL_MF_MOVE_ALL) || page_mapcount(page) == 1) { if (!isolate_lru_page(page)) { list_add_tail(&page->lru, pagelist); inc_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); } } }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter3144.29%233.33%
Nicholas Piggin1521.43%116.67%
Andrew Morton1217.14%116.67%
Motohiro Kosaki1115.71%116.67%
Mel Gorman11.43%116.67%
Total70100.00%6100.00%


static struct page *new_node_page(struct page *page, unsigned long node, int **x) { if (PageHuge(page)) return alloc_huge_page_node(page_hstate(compound_head(page)), node); else return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE | __GFP_THISNODE, 0); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter3053.57%233.33%
Naoya Horiguchi2239.29%116.67%
David Rientjes23.57%116.67%
Mel Gorman11.79%116.67%
Vlastimil Babka11.79%116.67%
Total56100.00%6100.00%

/* * Migrate pages from one node to a target node. * Returns error or the number of pages not migrated. */
static int migrate_to_node(struct mm_struct *mm, int source, int dest, int flags) { nodemask_t nmask; LIST_HEAD(pagelist); int err = 0; nodes_clear(nmask); node_set(source, nmask); /* * This does not "check" the range but isolates all pages that * need migration. Between passing in the full user address * space range and MPOL_MF_DISCONTIG_OK, this call can not fail. */ VM_BUG_ON(!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL))); queue_pages_range(mm, mm->mmap->vm_start, mm->task_size, &nmask, flags | MPOL_MF_DISCONTIG_OK, &pagelist); if (!list_empty(&pagelist)) { err = migrate_pages(&pagelist, new_node_page, NULL, dest, MIGRATE_SYNC, MR_SYSCALL); if (err) putback_movable_pages(&pagelist); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter6853.54%426.67%
MinChan Kim2620.47%213.33%
Andrew Morton2116.54%16.67%
Mel Gorman32.36%213.33%
Greg Thelen32.36%16.67%
Naoya Horiguchi21.57%213.33%
David Rientjes21.57%16.67%
Adrian Bunk10.79%16.67%
Hugh Dickins10.79%16.67%
Total127100.00%15100.00%

/* * Move pages between the two nodesets so as to preserve the physical * layout as much as possible. * * Returns the number of page that could not be moved. */
int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, int flags) { int busy = 0; int err; nodemask_t tmp; err = migrate_prep(); if (err) return err; down_read(&mm->mmap_sem); /* * Find a 'source' bit set in 'tmp' whose corresponding 'dest' * bit in 'to' is not also set in 'tmp'. Clear the found 'source' * bit in 'tmp', and return that <source, dest> pair for migration. * The pair of nodemasks 'to' and 'from' define the map. * * If no pair of bits is found that way, fallback to picking some * pair of 'source' and 'dest' bits that are not the same. If the * 'source' and 'dest' bits are the same, this represents a node * that will be migrating to itself, so no pages need move. * * If no bits are left in 'tmp', or if all remaining bits left * in 'tmp' correspond to the same bit in 'to', return false * (nothing left to migrate). * * This lets us pick a pair of nodes to migrate between, such that * if possible the dest node is not already occupied by some other * source node, minimizing the risk of overloading the memory on a * node that would happen if we migrated incoming memory to a node * before migrating outgoing memory source that same node. * * A single scan of tmp is sufficient. As we go, we remember the * most recent <s, d> pair that moved (s != d). If we find a pair * that not only moved, but what's better, moved to an empty slot * (d is not set in tmp), then we break out then, with that pair. * Otherwise when we finish scanning from_tmp, we at least have the * most recent <s, d> pair that moved. If we get all the way through * the scan of tmp without finding any node that moved, much less * moved to an empty node, then there is nothing left worth migrating. */ tmp = *from; while (!nodes_empty(tmp)) { int s,d; int source = NUMA_NO_NODE; int dest = 0; for_each_node_mask(s, tmp) { /* * do_migrate_pages() tries to maintain the relative * node relationship of the pages established between * threads and memory areas. * * However if the number of source nodes is not equal to * the number of destination nodes we can not preserve * this node relative relationship. In that case, skip * copying memory from a node that is in the destination * mask. * * Example: [2,3,4] -> [3,4,5] moves everything. * [0-7] - > [3,4,5] moves only 0,1,2,6,7. */ if ((nodes_weight(*from) != nodes_weight(*to)) && (node_isset(s, *to))) continue; d = node_remap(s, *from, *to); if (s == d) continue; source = s; /* Node moved. Memorize */ dest = d; /* dest not in remaining from nodes? */ if (!node_isset(dest, tmp)) break; } if (source == NUMA_NO_NODE) break; node_clear(source, tmp); err = migrate_to_node(mm, source, dest, flags); if (err > 0) busy += err; if (err < 0) break; } up_read(&mm->mmap_sem); if (err < 0) return err; return busy; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter19084.07%450.00%
Larry Woodman2511.06%112.50%
Andrew Morton83.54%112.50%
Jianguo Wu20.88%112.50%
Justin P. Mattock10.44%112.50%
Total226100.00%8100.00%

/* * Allocate a new page for page migration based on vma policy. * Start by assuming the page is mapped by the same vma as contains @start. * Search forward from there, if not. N.B., this assumes that the * list of pages handed to migrate_pages()--which is how we get here-- * is in virtual address order. */
static struct page *new_page(struct page *page, unsigned long start, int **x) { struct vm_area_struct *vma; unsigned long uninitialized_var(address); vma = find_vma(current->mm, start); while (vma) { address = page_address_in_vma(page, vma); if (address != -EFAULT) break; vma = vma->vm_next; } if (PageHuge(page)) { BUG_ON(!vma); return alloc_huge_page_noerr(vma, address, 1); } /* * if !vma, alloc_page_vma() will use task or system default policy */ return alloc_page_vma(GFP_HIGHUSER_MOVABLE, vma, address); }

Contributors

PersonTokensPropCommitsCommitProp
Lee Schermerhorn3632.73%114.29%
Christoph Lameter3531.82%228.57%
Naoya Horiguchi1715.45%114.29%
Hugh Dickins1311.82%114.29%
Michal Hocko54.55%114.29%
Wanpeng Li43.64%114.29%
Total110100.00%7100.00%

#else
static void migrate_page_add(struct page *page, struct list_head *pagelist, unsigned long flags) { }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter19100.00%1100.00%
Total19100.00%1100.00%


int do_migrate_pages(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, int flags) { return -ENOSYS; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter2592.59%150.00%
Andrew Morton27.41%150.00%
Total27100.00%2100.00%


static struct page *new_page(struct page *page, unsigned long start, int **x) { return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter1872.00%133.33%
Keith Owens520.00%133.33%
Hugh Dickins28.00%133.33%
Total25100.00%3100.00%

#endif
static long do_mbind(unsigned long start, unsigned long len, unsigned short mode, unsigned short mode_flags, nodemask_t *nmask, unsigned long flags) { struct mm_struct *mm = current->mm; struct mempolicy *new; unsigned long end; int err; LIST_HEAD(pagelist); if (flags & ~(unsigned long)MPOL_MF_VALID) return -EINVAL; if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) return -EPERM; if (start & ~PAGE_MASK) return -EINVAL; if (mode == MPOL_DEFAULT) flags &= ~MPOL_MF_STRICT; len = (len + PAGE_SIZE - 1) & PAGE_MASK; end = start + len; if (end < start) return -EINVAL; if (end == start) return 0; new = mpol_new(mode, mode_flags, nmask); if (IS_ERR(new)) return PTR_ERR(new); if (flags & MPOL_MF_LAZY) new->flags |= MPOL_F_MOF; /* * If we are using the default policy then operation * on discontinuous address spaces is okay after all */ if (!new) flags |= MPOL_MF_DISCONTIG_OK; pr_debug("mbind %lx-%lx mode:%d flags:%d nodes:%lx\n", start, start + len, mode, mode_flags, nmask ? nodes_addr(*nmask)[0] : NUMA_NO_NODE); if (flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) { err = migrate_prep(); if (err) goto mpol_out; } { NODEMASK_SCRATCH(scratch); if (scratch) { down_write(&mm->mmap_sem); task_lock(current); err = mpol_set_nodemask(new, nmask, scratch); task_unlock(current); if (err) up_write(&mm->mmap_sem); } else err = -ENOMEM; NODEMASK_SCRATCH_FREE(scratch); } if (err) goto mpol_out; err = queue_pages_range(mm, start, end, nmask, flags | MPOL_MF_INVERT, &pagelist); if (!err) err = mbind_range(mm, start, end, new); if (!err) { int nr_failed = 0; if (!list_empty(&pagelist)) { WARN_ON_ONCE(flags & MPOL_MF_LAZY); nr_failed = migrate_pages(&pagelist, new_page, NULL, start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND); if (nr_failed) putback_movable_pages(&pagelist); } if (nr_failed && (flags & MPOL_MF_STRICT)) err = -EIO; } else putback_movable_pages(&pagelist); up_write(&mm->mmap_sem); mpol_out: mpol_put(new); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter30166.30%826.67%
Lee Schermerhorn347.49%26.67%
Miao Xie316.83%13.33%
Kamezawa Hiroyuki306.61%13.33%
Motohiro Kosaki153.30%310.00%
David Rientjes143.08%516.67%
MinChan Kim112.42%13.33%
Paul Mundt61.32%13.33%
Hugh Dickins51.10%26.67%
Mel Gorman20.44%13.33%
Naoya Horiguchi20.44%26.67%
Paul Jackson10.22%13.33%
Adrian Bunk10.22%13.33%
JoonSoo Kim10.22%13.33%
Total454100.00%30100.00%

/* * User space interface with variable sized bitmaps for nodelists. */ /* Copy a node mask from user space. */
static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, unsigned long maxnode) { unsigned long k; unsigned long nlongs; unsigned long endmask; --maxnode; nodes_clear(*nodes); if (maxnode == 0 || !nmask) return 0; if (maxnode > PAGE_SIZE*BITS_PER_BYTE) return -EINVAL; nlongs = BITS_TO_LONGS(maxnode); if ((maxnode % BITS_PER_LONG) == 0) endmask = ~0UL; else endmask = (1UL << (maxnode % BITS_PER_LONG)) - 1; /* When the user specified more nodes than supported just check if the non supported part is all zero. */ if (nlongs > BITS_TO_LONGS(MAX_NUMNODES)) { if (nlongs > PAGE_SIZE/sizeof(long)) return -EINVAL; for (k = BITS_TO_LONGS(MAX_NUMNODES); k < nlongs; k++) { unsigned long t; if (get_user(t, nmask + k)) return -EFAULT; if (k == nlongs - 1) { if (t & endmask) return -EINVAL; } else if (t) return -EINVAL; } nlongs = BITS_TO_LONGS(MAX_NUMNODES); endmask = ~0UL; } if (copy_from_user(nodes_addr(*nodes), nmask, nlongs*sizeof(unsigned long))) return -EFAULT; nodes_addr(*nodes)[nlongs-1] &= endmask; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Lameter22690.76%240.00%
Andrew Morton114.42%120.00%
Chris Wright104.02%120.00%
Andi Kleen20.80%120.00%
Total249100.00%5100.00%

/* Copy a kernel node mask to user space */
static int copy_nodes_to_user(unsigned long __user *mask, unsigned long maxnode, nodemask_t *nodes) { unsigned long copy = ALIGN(maxnode-1, 64) / 8; const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long); if (copy > nbytes) { if (copy > PAGE_SIZE) return -EINVAL; if (clear_user((char __user *)mask + nbytes, copy - nbytes)) return -EFAULT; copy = nbytes; } return copy_to_user(mask, nodes_addr(*nodes), copy) ? -EFAULT : 0; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton8475.00%125.00%
Andi Kleen2320.54%250.00%
Al Viro54.46%125.00%
Total112100.00%4100.00%

SYSCALL_DEFINE6(mbind, unsigned long, start, unsigned long, len, unsigned long, mode, const unsigned long __user *, nmask, unsigned long, maxnode, unsigned, flags) { nodemask_t nodes; int err; unsigned short mode_flags; mode_flags = mode & MPOL_MODE_FLAGS; mode &= ~MPOL_MODE_FLAGS; if (mode >= MPOL_MAX) return -EINVAL; if ((mode_flags & MPOL_F_STATIC_NODES) && (mode_flags & MPOL_F_RELATIVE_NODES)) return -EINVAL; err = get_nodes(&nodes, nmask, maxnode); if (err) return err; return do_mbind(start, len, mode, mode_flags, &nodes, flags); } /* Set the process memory policy */ SYSCALL_DEFINE3(set_mempolicy, int, mode, const unsigned long __user *, nmask, unsigned long, maxnode) { int err; nodemask_t nodes; unsigned short flags; flags = mode & MPOL_MODE_FLAGS; mode &= ~MPOL_MODE_FLAGS; if ((unsigned int)mode >= MPOL_MAX) return -EINVAL; if ((flags & MPOL_F_STATIC_NODES) && (flags & MPOL_F_RELATIVE_NODES)) return -EINVAL; err = get_nodes(&nodes, nmask, maxnode); if (err) return err; return do_set_mempolicy(mode, flags, &nodes); } SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode, const unsigned long __user *, old_nodes, const unsigned long __user *, new_nodes) { const struct cred *cred = current_cred(), *tcred; struct mm_struct *mm = NULL; struct task_struct *task; nodemask_t task_nodes; int err; nodemask_t *old; nodemask_t *new; NODEMASK_SCRATCH(scratch); if (!scratch) return -ENOMEM; old = &scratch->mask1; new = &scratch->mask2; err = get_nodes(old, old_nodes, maxnode); if (err) goto out; err = get_nodes(new, new_nodes, maxnode); if (err) goto out; /* Find the mm_struct */ rcu_read_lock(); task = pid ? find_task_by_vpid(pid) : current; if (!task) { rcu_read_unlock(); err = -ESRCH; goto out; } get_task_struct(task); err = -EINVAL; /* * Check if this process has the right to modify the specified * process. The right exists if the process has administrative * capabilities, superuser privileges or the same * userid as the target process. */ tcred = __task_cred(task); if (!uid_eq(cred->euid, tcred->suid) && !uid_eq(cred->euid, tcred->uid) && !uid_eq(cred->uid, tcred->suid) && !uid_eq(cred->uid, tcred->uid) && !capable(CAP_SYS_NICE)) { rcu_read_unlock(); err = -EPERM; goto out_put; } rcu_read_unlock(); task_nodes = cpuset_mems_allowed(task); /* Is the user allowed to access the target nodes? */ if (!nodes_subset(*new, task_nodes) && !capable(CAP_SYS_NICE)) { err = -EPERM; goto out_put; } if (!nodes_subset(*new, node_states[N_MEMORY])) { err = -EINVAL; goto out_put; } err = security_task_movememory(task); if (err) goto out_put; mm = get_task_mm(task); put_task_struct(task); if (!mm) { err = -EINVAL; goto out; } err = do_migrate_pages(mm, old, new, capable(CAP_SYS_NICE) ? MPOL_MF_MOVE_ALL : MPOL_MF_MOVE); mmput(mm); out: NODEMASK_SCRATCH_FREE(scratch); return err; out_put: put_task_struct(task); goto out; } /* Retrieve NUMA policy */ SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, unsigned long __user *, nmask, unsigned long, maxnode, unsigned long, addr, unsigned long, flags) { int err; int uninitialized_var(pval); nodemask_t nodes; if (nmask != NULL && maxnode < MAX_NUMNODES) return -EINVAL; err = do_get_mempolicy(&pval, &nodes, addr, flags); if (err) return err; if (policy && put_user(pval, policy)) return -EFAULT; if (nmask) err = copy_nodes_to_user(nmask, maxnode, &nodes); return err; } #ifdef CONFIG_COMPAT COMPAT_SYSCALL_DEFINE5(get_mempolicy, int __user *, policy, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode, compat_ulong_t, addr, compat_ulong_t, flags) { long err; unsigned long __user *nm = NULL; unsigned long nr_bits, alloc_size; DECLARE_BITMAP(bm, MAX_NUMNODES); nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; if (nmask) nm = compat_alloc_user_space(alloc_size); err = sys_get_mempolicy(policy, nm, nr_bits+1, addr, flags); if (!err && nmask) { unsigned long copy_size; copy_size = min_t(unsigned long, sizeof(bm), alloc_size); err = copy_from_user(bm, nm, copy_size); /* ensure entire bitmap is zeroed */ err |= clear_user(nmask, ALIGN(maxnode-1, 8) / 8); err |= compat_put_bitmap(nmask, bm, nr_bits); } return err; } COMPAT_SYSCALL_DEFINE3(set_mempolicy, int, mode, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode) { unsigned long __user *nm = NULL; unsigned long nr_bits, alloc_size; DECLARE_BITMAP(bm, MAX_NUMNODES); nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; if (nmask) { if (compat_get_bitmap(bm, nmask, nr_bits)) return -EFAULT; nm = compat_alloc_user_space(alloc_size); if (copy_to_user(nm, bm, alloc_size)) return -EFAULT; } return sys_set_mempolicy(mode, nm, nr_bits+1); } COMPAT_SYSCALL_DEFINE6(mbind, compat_ulong_t, start, compat_ulong_t, len, compat_ulong_t, mode, compat_ulong_t __user *, nmask, compat_ulong_t, maxnode, compat_ulong_t, flags) { unsigned long __user *nm = NULL; unsigned long nr_bits, alloc_size; nodemask_t bm; nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES); alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8; if (nmask) { if (compat_get_bitmap(nodes_addr(bm), nmask, nr_bits)) return -EFAULT; nm = compat_alloc_user_space(alloc_size); if (copy_to_user(nm, nodes_addr(bm), alloc_size)) return -EFAULT; } return sys_mbind(start, len, mode, nm, nr_bits+1, flags); } #endif
struct mempolicy *__get_vma_policy(struct vm_area_struct *vma, unsigned long addr) { struct mempolicy *pol = NULL; if (vma) { if (vma->vm_ops && vma->vm_ops->get_policy) { pol = vma->vm_ops->get_policy(vma, addr); } else if (vma->vm_policy) { pol = vma->vm_policy; /* * shmem_alloc_page() passes MPOL_F_SHARED policy with * a pseudo vma whose vma->vm_ops=NULL. Take a reference * count on these policies which will be dropped by * mpol_cond_put() later */ if (mpol_needs_cond_ref(pol)) mpol_get(pol); } } return pol; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton6271.26%120.00%
Mel Gorman1517.24%120.00%
Oleg Nesterov89.20%240.00%
Lee Schermerhorn22.30%120.00%
Total87100.00%5100.00%

/* * get_vma_policy(@vma, @addr) * @vma: virtual memory area whose policy is sought * @addr: address in @vma for shared policy lookup * * Returns effective policy for a VMA at specified address. * Falls back to current->mempolicy or system default policy, as necessary. * Shared policies [those marked as MPOL_F_SHARED] require an extra reference * count--added by the get_policy() vm_op, as appropriate--to protect against * freeing by another task. It is the caller's responsibility to free the * extra reference for shared policies. */
static struct mempolicy *get_vma_policy(struct vm_area_struct *vma, unsigned long addr) { struct mempolicy *pol = __get_vma_policy(vma, addr); if (!pol) pol = get_task_policy(current); return pol; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov4090.91%375.00%
Andrew Morton49.09%125.00%
Total44100.00%4100.00%


bool vma_policy_mof(struct vm_area_struct *vma) { struct mempolicy *pol; if (vma->vm_ops && vma->vm_ops->get_policy) { bool ret = false; pol = vma->vm_ops->get_policy(vma, vma->vm_start); if (pol && (pol->flags & MPOL_F_MOF)) ret = true; mpol_cond_put(pol); return ret; } pol = vma->vm_policy; if (!pol) pol = get_task_policy(current); return pol->flags & MPOL_F_MOF; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman8687.76%133.33%
Oleg Nesterov1212.24%266.67%
Total98100.00%3100.00%


static int apply_policy_zone(struct mempolicy *policy, enum zone_type zone) { enum zone_type dynamic_policy_zone = policy_zone; BUG_ON(dynamic_policy_zone == ZONE_MOVABLE); /* * if policy->v.nodes has movable memory only, * we apply policy when gfp_zone(gfp) = ZONE_MOVABLE only. * * policy->v.nodes is intersect with node_states[N_MEMORY]. * so if the following test faile, it implies * policy->v.nodes has movable memory only. */ if (!nodes_intersects(policy->v.nodes, node_states[N_HIGH_MEMORY])) dynamic_policy_zone = ZONE_MOVABLE; return zone >= dynamic_policy_zone; }

Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan55100.00%1100.00%
Total55100.00%1100.00%

/* * Return a nodemask representing a mempolicy for filtering nodes for * page allocation */
static nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy) { /* Lower zones don't get a nodemask applied for MPOL_BIND */ if (unlikely(policy->mode == MPOL_BIND) && apply_policy_zone(policy, gfp_zone(gfp)) && cpuset_nodemask_valid_mems_allowed(&policy->v.nodes)) return &policy->v.nodes; return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman3967.24%116.67%
Andrew Morton1118.97%116.67%
Lai Jiangshan58.62%116.67%
Lee Schermerhorn23.45%233.33%
Al Viro11.72%116.67%
Total58100.00%6100.00%

/* Return a zonelist indicated by gfp for node representing a mempolicy */
static struct zonelist *policy_zonelist(gfp_t gfp, struct mempolicy *policy, int nd) { if (policy->mode == MPOL_PREFERRED && !(policy->flags & MPOL_F_LOCAL)) nd = policy->v.preferred_node; else { /* * __GFP_THISNODE shouldn't even be used with the bind policy * because we might easily break the expectation to stay on the * requested node and not break the policy. */ WARN_ON_ONCE(policy->mode == MPOL_BIND && (gfp & __GFP_THISNODE)); } return node_zonelist(nd, gfp); }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton2129.58%111.11%
Mel Gorman1825.35%222.22%
Michal Hocko1521.13%111.11%
Lee Schermerhorn1115.49%333.33%
Andi Kleen34.23%111.11%
Al Viro34.23%111.11%
Total71100.00%9100.00%

/* Do dynamic interleaving for a process */
static unsigned interleave_nodes(struct mempolicy *policy) { unsigned nid, next; struct task_struct *me = current; nid = me->il_next; next = next_node_in(nid, policy->v.nodes); if (next < MAX_NUMNODES) me->il_next = next; return nid; }

Contributors

PersonTokensPropCommitsCommitProp
Andrew Morton5291.23%250.00%
David Rientjes35.26%125.00%
Andi Kleen23.51%125.00%
Total57100.00%4100.00%

/* * Depending on the memory policy provide a node from which to allocate the * next slab entry. */
unsigned int mempolicy_slab_node(void) { struct mempolicy *policy; int node = numa_mem_id(); if (in_interrupt()) return node; policy = current->mempolicy; if (!policy || policy->flags & MPOL_F_LOCAL) return node; switch (policy->mode) { case MPOL_PREFERRED: /* * handled MPOL_F_LOCAL above */ return policy->v.preferred_node; case MPOL_INTERLEAVE: return interleave_nodes(policy); case MPOL_BIND: { struct zoneref *z; /* * Follow bind policy behavior and start allocation at the * first node. */ struct zonelist *zonelist; enum zone_type highest_zoneidx = gfp_zone(GFP_KERNEL); zonelist = &NODE_DATA(node)->node_zonelists[ZONELIST_FALLBACK]; z = first_zones_zonelist(zonelist, highest_zoneidx, &policy->v.nodes); return z->zone ? z->zone->node : node; } default: BUG(); } }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman5134.93%323.08%
Christoph Lameter3423.29%323.08%
Lee Schermerhorn2819.18%323.08%
Andi Kleen1711.64%17.69%
David Rientjes128.22%17.69%
Eric Dumazet32.05%17.69%
Aneesh Kumar K.V10.68%17.69%
Total146100.00%13100.00%

/* * Do static interleaving for a VMA with known offset @n. Returns the n'th * node in pol->v.nodes (starting from n=0), wrapping around if n exceeds the * number of present nodes. */
static unsigned offset_il_node(struct mempolicy *pol, struct vm_area_struct *vma, unsigned long n) { unsigned nnodes = nodes_weight(pol->v.nodes); unsigned target; int i; int nid; if (!nnodes) return numa_node_id(); target = (unsigned int)n % nnodes; nid = first_node(pol->v.nodes); for (i = 0; i < target; i++) nid = next_node(nid, pol->v.nodes); return nid; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes4343.00%114.29%
Andrew Morton3434.00%228.57%
Lee Schermerhorn1010.00%228.57%
Christoph Lameter77.00%114.29%
Mel Gorman66.00%114.29%
Total100100.00%7100.00%

/* Determine a node number for interleave */
static inline unsigned interleave_nid(struct mempolicy *pol, struct vm_area_struct *vma, unsigned long addr, int shift) { if (vma) { unsigned long off; /* * for small pages, there is no difference between * shift and PAGE_SHIFT, so the bit-shift is safe. * for huge pages, since vm_pgoff is in units of small * pages, we need to shift off the always 0 bits to get * a useful offset. */ BUG_ON(shift < PAGE_SHIFT); off = vma->vm_pgoff >> (shift - PAGE_SHIFT); off += (addr - vma->vm_start) >> shift; return offset_il_node(pol, vma, off); } else return interleave_nodes(pol); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes6375.90%120.00%
Andrew Morton1416.87%120.00%
Christoph Lameter33.61%120.00%
Andi Kleen22.41%120.00%
Al Viro11.20%120.00%
Total83100.00%5100.00%

#ifdef CONFIG_HUGETLBFS /* * huge_zonelist(@vma, @addr, @gfp_flags, @mpol) * @vma: virtual memory area whose policy is sought * @addr: address in @vma for shared policy lookup and interleave policy * @gfp_flags: for requested zone * @mpol: pointer to mempolicy pointer for reference counted mempolicy * @nodemask: pointer to nodemask pointer for MPOL_BIND nodemask * * Returns a zonelist suitable for a huge page allocation and a pointer * to the struct mempolicy for conditional unref after allocation. * If the effective policy is 'BIND, returns a pointer to the mempolicy's * @nodemask for filtering the zonelist. * * Must be protected by read_mems_allowed_begin() */
struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr, gfp_t gfp_flags, struct mempolicy **mpol, nodemask_t **nodemask) { struct zonelist *zl; *mpol = get_vma_policy(vma, addr); *nodemask = NULL; /* assume !MPOL_BIND */ if (unlikely((*mpol)->mode == MPOL_INTERLEAVE)) { zl = node_zonelist(interleave_nid(*mpol, vma, addr, huge_page_shift(hstate_vma(vma))), gfp_flags); } else { zl = policy_zonelist(gfp_flags, *mpol, numa_node_id()); if ((*mpol)->mode == MPOL_BIND) *nodemask = &(*mpol)->v.nodes; } return zl; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes4634.07%111.11%
Lee Schermerhorn4533.33%333.33%
Andrew Morton3122.96%111.11%
Andi Kleen107.41%222.22%
Mel Gorman21.48%111.11%
Paul Jackson10.74%111.11%
Total135100.00%9100.00%

/* * init_nodemask_of_mempolicy * * If the current task's mempolicy is "default" [NULL], return 'false' * to indicate default policy. Otherwise, extract the policy nodemask * for 'bind' or 'interleave' policy into the argument nodemask, or * initialize the argument nodemask to contain the single node for * 'preferred' or 'local' policy and return 'true' to indicate presence * of non-default mempolicy. * * We don't bother with reference counting the mempolicy [mpol_get/put] * because the current task is examining it's own mempolicy and a task's * mempolicy is only ever changed by the task itself. * * N.B., it is the caller's responsibility to free a returned nodemask. */
bool init_nodemask_of_mempolicy(nodemask_t *mask) { struct mempolicy *mempolicy; int nid; if (!(mask && current->mempolicy)) return false; task_lock(current); mempolicy = current->mempolicy; switch (mempolicy->mode) { case MPOL_PREFERRED: if (mempolicy->flags & MPOL_F_LOCAL) nid = numa_node_id(); else nid = mempolicy->v.preferred_node; init_nodemask_of_node(mask, nid); break; case MPOL_BIND: /* Fall through */ case MPOL_INTERLEAVE: *mask = mempolicy->v.nodes; break; default: BUG(); } task_unlock(current); return true; }

Contributors

PersonTokensPropCommitsCommitProp
Lee Schermerhorn10291.07%150.00%
Miao Xie108.93%150.00%
Total112100.00%2100.00%

#endif /* * mempolicy_nodemask_intersects * * If tsk's mempolicy is "default" [NULL], return 'true' to indicate default * policy. Otherwise, check for intersection between mask and the policy * nodemask for 'bind' or 'interleave' policy. For 'perferred' or 'local' * policy, always return true since it may allocate elsewhere on fallback. * * Takes task_lock(tsk) to prevent freeing of its mempolicy. */
bool mempolicy_nodemask_intersects(struct task_struct *tsk, const nodemask_t *mask) { struct mempolicy *mempolicy; bool ret = true; if (!mask) return ret; task_lock(tsk); mempolicy = tsk->mempolicy; if (!mempolicy) goto out; switch (mempolicy->mode) { case MPOL_PREFERRED: /* * MPOL_PREFERRED and MPOL_F_LOCAL are only preferred nodes to * allocate from, they may fallback to other nodes when oom. * Thus, it's possible for tsk to have allocated memory from * nodes in mask. */ break; case MPOL_BIND: case MPOL_INTERLEAVE: ret = nodes_intersects(mempolicy->v.nodes, *mask); break; default: BUG(); } out: task_unlock(tsk); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes100100.00%1100.00%
Total100100.00%1100.00%

/* Allocate a page in interleaved policy. Own path because it needs to do special accounting. */
static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, unsigned nid) { struct zonelist *zl; struct page *page; zl = node_zonelist(nid, gfp); page = __alloc_pages(gfp, order, zl); if (page && page_zone(page) == zonelist_zone(&zl->_zonerefs[0])) inc_zone_page_state(page, NUMA_INTERLEAVE_HIT); return page; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes5875.32%250.00%
Andrew Morton1418.18%125.00%
Paul Jackson56.49%125.00%
Total77100.00%4100.00%

/** * alloc_pages_vma - Allocate a page for a VMA. * * @gfp: * %GFP_USER user allocation. * %GFP_KERNEL kernel allocations, * %GFP_HIGHMEM highmem/user allocations, * %GFP_FS allocation should not call back into a file system. * %GFP_ATOMIC don't sleep. * * @order:Order of the GFP allocation. * @vma: Pointer to VMA or NULL if not available. * @addr: Virtual Address of the allocation. Must be inside the VMA. * @node: Which node to prefer for allocation (modulo policy). * @hugepage: for hugepages try only the preferred node if possible * * This function allocates a page from the kernel page pool and applies * a NUMA policy associated with the VMA or the current process. * When VMA is not NULL caller must hold down_read on the mmap_sem of the * mm_struct of the VMA to prevent it from going away. Should be used for * all allocations for pages that will be mapped into user space. Returns * NULL when no page can be allocated. */
struct page * alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, unsigned long addr, int node, bool hugepage) { struct mempolicy *pol; struct page *page; unsigned int cpuset_mems_cookie; struct zonelist *zl; nodemask_t *nmask; retry_cpuset: pol = get_vma_policy(vma, addr); cpuset_mems_cookie = read_mems_allowed_begin(); if (pol->mode == MPOL_INTERLEAVE) { unsigned nid; nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order); mpol_cond_put(pol); page = alloc_page_interleave(gfp, order, nid); goto out; } if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) { int hpage_node = node; /* * For hugepage allocation and non-interleave policy which * allows the current node (or other explicitly preferred * node) we only try to allocate from the current/preferred * node and don't fall back to other nodes, as the cost of * remote accesses would likely offset THP benefits. * * If the policy is interleave, or does not allow the current * node in its nodemask, we allocate the standard way. */ if (pol->mode == MPOL_PREFERRED && !(pol->flags & MPOL_F_LOCAL)) hpage_node = pol->v.preferred_node; nmask = policy_nodemask(gfp, pol); if (!nmask || node_isset(hpage_node, *nmask)) { mpol_cond_put(pol); page = __alloc_pages_node(hpage_node, gfp | __GFP_THISNODE, order); goto out; } } nmask = policy_nodemask(gfp, pol); zl = policy_zonelist(gfp, pol, node); page = __alloc_pages_nodemask(gfp, order, zl, nmask); mpol_cond_put(pol); out: if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) goto retry_cpuset; return page; }

Contributors

PersonTokensPropCommitsCommitProp
Vlastimil Babka12547.53%425.00%
Aneesh Kumar K.V4617.49%16.25%
David Rientjes3513.31%212.50%
Mel Gorman228.37%212.50%
Andrew Morton145.32%16.25%
Miao Xie103.80%16.25%
Andrea Arcangeli51.90%16.25%
Andi Kleen31.14%16.25%
Lee Schermerhorn20.76%212.50%
Oleg Nesterov10.38%16.25%
Total263100.00%16100.00%

/** * alloc_pages_current - Allocate pages. * * @gfp: * %GFP_USER user allocation, * %GFP_KERNEL kernel allocation, * %GFP_HIGHMEM highmem allocation, * %GFP_FS don't call back into a file system. * %GFP_ATOMIC don't sleep. * @order: Power of two of allocation size in pages. 0 is a single page. * * Allocate a page from the kernel page pool. When not in * interrupt context and apply the current process NUMA policy. * Returns NULL when no page can be allocated. * * Don't call cpuset_update_task_memory_state() unless * 1) it's ok to take cpuset_sem (can WAIT), and * 2) allocating for current task (not interrupt). */
struct page *alloc_pages_current(gfp_t gfp, unsigned order) { struct mempolicy *pol = &default_policy; struct page *page; unsigned int cpuset_mems_cookie; if (!in_interrupt() && !(gfp & __GFP_THISNODE)) pol = get_task_policy(current); retry_cpuset: cpuset_mems_cookie = read_mems_allowed_begin(); /* * No reference counting needed for current->mempolicy * nor system default_policy */ if (pol->mode == MPOL_INTERLEAVE) page = alloc_page_interleave(gfp, order, interleave_nodes(pol)); else page = __alloc_pages_nodemask(gfp, order, policy_zonelist(gfp, pol, numa_node_id()), policy_nodemask(gfp, pol)); if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie))) goto retry_cpuset; return page; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes4031.75%111.11%
Andrew Morton2923.02%111.11%
Mel Gorman2519.84%222.22%
Miao Xie1612.70%111.11%
Oleg Nesterov97.14%111.11%
Lee Schermerhorn43.17%222.22%
Andi Kleen32.38%111.11%
Total126100.00%9100.00%

EXPORT_SYMBOL(alloc_pages_current);
int vma_dup_policy(struct vm_area_struct *src, struct vm_area_struct *dst) { struct mempolicy *pol = mpol_dup(vma_policy(src)); if (IS_ERR(pol)) return PTR_ERR(pol); dst->vm_policy = pol; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Oleg Nesterov50100.00%1100.00%
Total50100.00%1100.00%

/* * If mpol_dup() sees current->cpuset == cpuset_being_rebound, then it * rebinds the mempolicy its copying by calling mpol_rebind_policy() * with the mems_allowed returned by cpuset_mems_allowed(). This * keeps mempolicies cpuset relative after its cpuset moves. See * further kernel/cpuset.c update_nodemask(). * * current's mempolicy may be rebinded by the other task(the task that changes * cpuset's mems), so we needn't do rebind work for current task. */ /* Slow path of a mempolicy duplicate */
struct mempolicy *__mpol_dup(struct mempolicy *old) { struct mempolicy *new = kmem_cache_alloc(policy_cache, GFP_KERNEL); if (!new) return ERR_PTR(-ENOMEM); /* task's mempolicy is protected by alloc_lock */ if (old == current->mempolicy) { task_lock(current); *new = *old; task_unlock(current); } else *new = *old; if (current_cpuset_is_being_rebound()) { nodemask_t mems = cpuset_mems_allowed(current); if (new->flags & MPOL_F_REBINDING) mpol_rebind_policy(new, &mems, MPOL_REBIND_STEP2); else mpol_rebind_policy(new, &mems, MPOL_REBIND_ONCE); } atomic_set(&new->refcnt, 1); return new; }

Contributors

PersonTokensPropCommitsCommitProp
Miao Xie5644.09%125.00%
David Rientjes4737.01%125.00%
Andrew Morton2318.11%125.00%
Lee Schermerhorn10.79%125.00%
Total127100.00%4100.00%

/* Slow path of a mempolicy comparison */
bool __mpol_equal(struct mempolicy *a, struct mempolicy *b) { if (!a || !b) return false; if (a->mode != b->mode) return false; if (a->flags != b->flags) return false; if (mpol_store_user_nodemask(a)) if (!nodes_equal(a->w.user_nodemask, b->w.user_nodemask)) return false; switch (a->mode) { case MPOL_BIND: /* Fall through */ case MPOL_INTERLEAVE: return !!nodes_equal(a->v.nodes, b->v.nodes); case MPOL_PREFERRED: return a->v.preferred_node == b->v.preferred_node; default: BUG(); return false; } }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes7152.21%116.67%
Bob Liu2518.38%116.67%
Andrew Morton2316.91%116.67%
Motohiro Kosaki85.88%116.67%
Hugh Dickins64.41%116.67%
Lee Schermerhorn32.21%116.67%
Total136100.00%6100.00%

/* * Shared memory backing store policy support. * * Remember policies even when nobody has shared memory mapped. * The policies are kept in Red-Black tree linked from the inode. * They are protected by the sp->lock rwlock, which should be held * for any accesses to the tree. */ /* * lookup first element intersecting start-end. Caller holds sp->lock for * reading or for writing */
static struct sp_node * sp_lookup(struct shared_policy *sp, unsigned long start, unsigned long end) { struct rb_node *n = sp->root.rb_node; while (n) { struct sp_node *p = rb_entry(n, struct sp_node, nd); if (start >= p->end) n = n->rb_right; else if (end <= p->start) n = n->rb_left; else break; } if (!n) return NULL; for (;;) { struct sp_node *w = NULL; struct rb_node *prev = rb_prev(n); if (!prev) break; w = rb_entry(prev, struct sp_node, nd); if (w->end <= start) break; n = prev; } return rb_entry(n, struct sp_node, nd); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes12075.95%133.33%
Andrew Morton3723.42%133.33%
Adrian Bunk10.63%133.33%
Total158100.00%3100.00%

/* * Insert a new shared policy into the list. Caller holds sp->lock for * writing. */
static void sp_insert(struct shared_policy *sp, struct sp_node *new) { struct rb_node **p = &sp->root.rb_node; struct rb_node *parent = NULL; struct sp_node *nd; while (*p) { parent = *p; nd = rb_entry(parent, struct sp_node, nd); if (new->start < nd->start) p = &(*p)->rb_left; else if (new->end > nd->end) p = &(*p)->rb_right; else BUG(); } rb_link_node(&new->nd, parent, p); rb_insert_color(&new->nd, &sp->root); pr_debug("inserting %lx-%lx: %d\n", new->start, new->end, new->policy ? new->policy->mode : 0); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes10968.12%125.00%
Andrew Morton4930.62%125.00%
Lee Schermerhorn10.62%125.00%
Hugh Dickins10.62%125.00%
Total160100.00%4100.00%

/* Find shared policy intersecting idx */
struct mempolicy * mpol_shared_policy_lookup(struct shared_policy *sp, unsigned long idx) { struct mempolicy *pol = NULL; struct sp_node *sn; if (!sp->root.rb_node) return NULL; read_lock(&sp->lock); sn = sp_lookup(sp, idx, idx+1); if (sn) { mpol_get(sn->policy); pol = sn->policy; } read_unlock(&sp->lock); return pol; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes5863.74%116.67%
Andrew Morton1718.68%116.67%
Hugh Dickins1010.99%116.67%
Steve Longerbeam22.20%116.67%
Mel Gorman22.20%116.67%
Nathan Zimmer22.20%116.67%
Total91100.00%6100.00%


static void sp_free(struct sp_node *n) { mpol_put(n->policy); kmem_cache_free(sn_cache, n); }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki25100.00%1100.00%
Total25100.00%1100.00%

/** * mpol_misplaced - check whether current page node is valid in policy * * @page: page to be checked * @vma: vm area where page mapped * @addr: virtual address where page mapped * * Lookup current policy node id for vma,addr and "compare to" page's * node id. * * Returns: * -1 - not misplaced, page is in the right node * node - node id where the page should be * * Policy determination "mimics" alloc_page_vma(). * Called from fault path where we know the vma and faulting address. */
int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long addr) { struct mempolicy *pol; struct zoneref *z; int curnid = page_to_nid(page); unsigned long pgoff; int thiscpu = raw_smp_processor_id(); int thisnid = cpu_to_node(thiscpu); int polnid = -1; int ret = -1; BUG_ON(!vma); pol = get_vma_policy(vma, addr); if (!(pol->flags & MPOL_F_MOF)) goto out; switch (pol->mode) { case MPOL_INTERLEAVE: BUG_ON(addr >= vma->vm_end); BUG_ON(addr < vma->vm_start); pgoff = vma->vm_pgoff; pgoff += (addr - vma->vm_start) >> PAGE_SHIFT; polnid = offset_il_node(pol, vma, pgoff); break; case MPOL_PREFERRED: if (pol->flags & MPOL_F_LOCAL) polnid = numa_node_id(); else polnid = pol->v.preferred_node; break; case MPOL_BIND: /* * allows binding to multiple nodes. * use current page if in policy nodemask, * else select nearest allowed node, if any. * If no allowed nodes, use current [!misplaced]. */ if (node_isset(curnid, pol->v.nodes)) goto out; z = first_zones_zonelist( node_zonelist(numa_node_id(), GFP_HIGHUSER), gfp_zone(GFP_HIGHUSER), &pol->v.nodes); polnid = z->zone->node; break; default: BUG(); } /* Migrate the page towards the node whose CPU is referencing it */ if (pol->flags & MPOL_F_MORON) { polnid = thisnid; if (!should_numa_migrate_memory(current, page, curnid, thiscpu)) goto out; } if (curnid != polnid) ret = polnid; out: mpol_cond_put(pol); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Lee Schermerhorn21272.85%18.33%
Mel Gorman258.59%433.33%
Peter Zijlstra155.15%18.33%
Rik Van Riel124.12%216.67%
Motohiro Kosaki113.78%18.33%
Robin Holt93.09%18.33%
David Rientjes72.41%216.67%
Total291100.00%12100.00%

/* * Drop the (possibly final) reference to task->mempolicy. It needs to be * dropped after task->mempolicy is set to NULL so that any allocation done as * part of its kmem_cache_free(), such as by KASAN, doesn't reference a freed * policy. */
void mpol_put_task_policy(struct task_struct *task) { struct mempolicy *pol; task_lock(task); pol = task->mempolicy; task->mempolicy = NULL; task_unlock(task); mpol_put(pol); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes42100.00%1100.00%
Total42100.00%1100.00%


static void sp_delete(struct shared_policy *sp, struct sp_node *n) { pr_debug("deleting %lx-l%lx\n", n->start, n->end); rb_erase(&n->nd, &sp->root); sp_free(n); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes2961.70%125.00%
Andrew Morton1123.40%125.00%
Hugh Dickins612.77%125.00%
Motohiro Kosaki12.13%125.00%
Total47100.00%4100.00%


static void sp_node_init(struct sp_node *node, unsigned long start, unsigned long end, struct mempolicy *pol) { node->start = start; node->end = end; node->policy = pol; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman42100.00%1100.00%
Total42100.00%1100.00%


static struct sp_node *sp_alloc(unsigned long start, unsigned long end, struct mempolicy *pol) { struct sp_node *n; struct mempolicy *newpol; n = kmem_cache_alloc(sn_cache, GFP_KERNEL); if (!n) return NULL; newpol = mpol_dup(pol); if (IS_ERR(newpol)) { kmem_cache_free(sn_cache, n); return NULL; } newpol->flags |= MPOL_F_SHARED; sp_node_init(n, start, end, newpol); return n; }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki4244.68%116.67%
David Rientjes3031.91%350.00%
Robin Holt1617.02%116.67%
Mel Gorman66.38%116.67%
Total94100.00%6100.00%

/* Replace a policy range. */
static int shared_policy_replace(struct shared_policy *sp, unsigned long start, unsigned long end, struct sp_node *new) { struct sp_node *n; struct sp_node *n_new = NULL; struct mempolicy *mpol_new = NULL; int ret = 0; restart: write_lock(&sp->lock); n = sp_lookup(sp, start, end); /* Take care of old policies in the same range. */ while (n && n->start < end) { struct rb_node *next = rb_next(&n->nd); if (n->start >= start) { if (n->end <= end) sp_delete(sp, n); else n->start = end; } else { /* Old policy spanning whole new range. */ if (n->end > end) { if (!n_new) goto alloc_new; *mpol_new = *n->policy; atomic_set(&mpol_new->refcnt, 1); sp_node_init(n_new, end, n->end, mpol_new); n->end = start; sp_insert(sp, n_new); n_new = NULL; mpol_new = NULL; break; } else n->end = start; } if (!next) break; n = rb_entry(next, struct sp_node, nd); } if (new) sp_insert(sp, new); write_unlock(&sp->lock); ret = 0; err_out: if (mpol_new) mpol_put(mpol_new); if (n_new) kmem_cache_free(sn_cache, n_new); return ret; alloc_new: write_unlock(&sp->lock); ret = -ENOMEM; n_new = kmem_cache_alloc(sn_cache, GFP_KERNEL); if (!n_new) goto err_out; mpol_new = kmem_cache_alloc(policy_cache, GFP_KERNEL); if (!mpol_new) goto err_out; goto restart; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman14444.04%222.22%
David Rientjes12437.92%222.22%
Andrew Morton4714.37%111.11%
Hillf Danton61.83%111.11%
Nathan Zimmer30.92%111.11%
Motohiro Kosaki20.61%111.11%
Andi Kleen10.31%111.11%
Total327100.00%9100.00%

/** * mpol_shared_policy_init - initialize shared policy for inode * @sp: pointer to inode shared policy * @mpol: struct mempolicy to install * * Install non-NULL @mpol in inode's shared policy rb-tree. * On entry, the current task has a reference on a non-NULL @mpol. * This must be released on exit. * This is called at get_inode() calls and we can use GFP_KERNEL. */
void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol) { int ret; sp->root = RB_ROOT; /* empty tree == default mempolicy */ rwlock_init(&sp->lock); if (mpol) { struct vm_area_struct pvma; struct mempolicy *new; NODEMASK_SCRATCH(scratch); if (!scratch) goto put_mpol; /* contextualize the tmpfs mount point mempolicy */ new = mpol_new(mpol->mode, mpol->flags, &mpol->w.user_nodemask); if (IS_ERR(new)) goto free_scratch; /* no valid nodemask intersection */ task_lock(current); ret = mpol_set_nodemask(new, &mpol->w.user_nodemask, scratch); task_unlock(current); if (ret) goto put_new; /* Create pseudo-vma that contains just the policy */ memset(&pvma, 0, sizeof(struct vm_area_struct)); pvma.vm_end = TASK_SIZE; /* policy covers entire file */ mpol_set_shared_policy(sp, &pvma, new); /* adds ref */ put_new: mpol_put(new); /* drop initial ref */ free_scratch: NODEMASK_SCRATCH_FREE(scratch); put_mpol: mpol_put(mpol); /* drop our incoming ref on sb mpol */ } }

Contributors

PersonTokensPropCommitsCommitProp
Lee Schermerhorn5128.02%430.77%
Miao Xie3720.33%17.69%
David Rientjes3519.23%17.69%
Andrew Morton3217.58%17.69%
Kamezawa Hiroyuki179.34%17.69%
Dan Carpenter31.65%17.69%
Andi Kleen31.65%17.69%
Hugh Dickins21.10%17.69%
Mel Gorman10.55%17.69%
Nathan Zimmer10.55%17.69%
Total182100.00%13100.00%


int mpol_set_shared_policy(struct shared_policy *info, struct vm_area_struct *vma, struct mempolicy *npol) { int err; struct sp_node *new = NULL; unsigned long sz = vma_pages(vma); pr_debug("set_shared_policy %lx sz %lu %d %d %lx\n", vma->vm_pgoff, sz, npol ? npol->mode : -1, npol ? npol->flags : -1, npol ? nodes_addr(npol->v.nodes)[0] : NUMA_NO_NODE); if (npol) { new = sp_alloc(vma->vm_pgoff, vma->vm_pgoff + sz, npol); if (!new) return -ENOMEM; } err = shared_policy_replace(info, vma->vm_pgoff, vma->vm_pgoff+sz, new); if (err && new) sp_free(new); return err; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes10570.47%228.57%
Paul Mundt2315.44%114.29%
Andrew Morton1510.07%114.29%
Andi Kleen42.68%114.29%
Motohiro Kosaki10.67%114.29%
Lee Schermerhorn10.67%114.29%
Total149100.00%7100.00%

/* Free a backing policy store on inode delete. */
void mpol_free_shared_policy(struct shared_policy *p) { struct sp_node *n; struct rb_node *next; if (!p->root.rb_node) return; write_lock(&p->lock); next = rb_first(&p->root); while (next) { n = rb_entry(next, struct sp_node, nd); next = rb_next(&n->nd); sp_delete(p, n); } write_unlock(&p->lock); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes7178.02%337.50%
Paul Jackson1516.48%225.00%
Mel Gorman22.20%112.50%
Nathan Zimmer22.20%112.50%
Motohiro Kosaki11.10%112.50%
Total91100.00%8100.00%

#ifdef CONFIG_NUMA_BALANCING static int __initdata numabalancing_override;
static void __init check_numabalancing_enable(void) { bool numabalancing_default = false; if (IS_ENABLED(CONFIG_NUMA_BALANCING_DEFAULT_ENABLED)) numabalancing_default = true; /* Parsed by setup_numabalancing. override == 1 enables, -1 disables */ if (numabalancing_override) set_numabalancing_state(numabalancing_override == 1); if (num_online_nodes() > 1 && !numabalancing_override) { pr_info("%s automatic NUMA balancing. Configure with numa_balancing= or the kernel.numa_balancing sysctl\n", numabalancing_default ? "Enabling" : "Disabling"); set_numabalancing_state(numabalancing_default); } }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman6396.92%360.00%
Joe Perches11.54%120.00%
Andrew Morton11.54%120.00%
Total65100.00%5100.00%


static int __init setup_numabalancing(char *str) { int ret = 0; if (!str) goto out; if (!strcmp(str, "enable")) { numabalancing_override = 1; ret = 1; } else if (!strcmp(str, "disable")) { numabalancing_override = -1; ret = 1; } out: if (!ret) pr_warn("Unable to parse numa_balancing=\n"); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman8098.77%266.67%
Andrew Morton11.23%133.33%
Total81100.00%3100.00%

__setup("numa_balancing=", setup_numabalancing); #else
static inline void __init check_numabalancing_enable(void) { }

Contributors

PersonTokensPropCommitsCommitProp
Mel Gorman9100.00%1100.00%
Total9100.00%1100.00%

#endif /* CONFIG_NUMA_BALANCING */ /* assumes fs == KERNEL_DS */
void __init numa_policy_init(void) { nodemask_t interleave_nodes; unsigned long largest = 0; int nid, prefer = 0; policy_cache = kmem_cache_create("numa_policy", sizeof(struct mempolicy), 0, SLAB_PANIC, NULL); sn_cache = kmem_cache_create("shared_policy_node", sizeof(struct sp_node), 0, SLAB_PANIC, NULL); for_each_node(nid) { preferred_node_policy[nid] = (struct mempolicy) { .refcnt = ATOMIC_INIT(1), .mode = MPOL_PREFERRED, .flags = MPOL_F_MOF | MPOL_F_MORON, .v = { .preferred_node = nid, }, }; } /* * Set interleaving policy for system init. Interleaving is only * enabled across suitably sized nodes (default is >= 16MB), or * fall back to the largest node if they're all smaller. */ nodes_clear(interleave_nodes); for_each_node_state(nid, N_MEMORY) { unsigned long total_pages = node_present_pages(nid); /* Preserve the largest node */ if (largest < total_pages) { largest = total_pages; prefer = nid; } /* Interleave this node? */ if ((total_pages << PAGE_SHIFT) >= (16 << 20)) node_set(nid, interleave_nodes); } /* All too small, use the largest */ if (unlikely(nodes_empty(interleave_nodes))) node_set(prefer, interleave_nodes); if (do_set_mempolicy(MPOL_INTERLEAVE, 0, &interleave_nodes)) pr_err("%s: interleaving failed\n", __func__); check_numabalancing_enable(); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes14267.30%337.50%
Mel Gorman5023.70%225.00%
Paul Jackson146.64%112.50%
Mitchel Humpherys41.90%112.50%
Lai Jiangshan10.47%112.50%
Total211100.00%8100.00%

/* Reset policy of current process to default */
void numa_default_policy(void) { do_set_mempolicy(MPOL_DEFAULT, 0, NULL); }

Contributors

PersonTokensPropCommitsCommitProp
Paul Jackson956.25%150.00%
David Rientjes743.75%150.00%
Total16100.00%2100.00%

/* * Parse and format mempolicy from/to strings */ /* * "local" is implemented internally by MPOL_PREFERRED with MPOL_F_LOCAL flag. */ static const char * const policy_modes[] = { [MPOL_DEFAULT] = "default", [MPOL_PREFERRED] = "prefer", [MPOL_BIND] = "bind", [MPOL_INTERLEAVE] = "interleave", [MPOL_LOCAL] = "local", }; #ifdef CONFIG_TMPFS /** * mpol_parse_str - parse string to mempolicy, for tmpfs mpol mount option. * @str: string containing mempolicy to parse * @mpol: pointer to struct mempolicy pointer, returned on success. * * Format of input: * <mode>[=<flags>][:<nodelist>] * * On success, returns 0, else 1 */
int mpol_parse_str(char *str, struct mempolicy **mpol) { struct mempolicy *new = NULL; unsigned short mode; unsigned short mode_flags; nodemask_t nodes; char *nodelist = strchr(str, ':'); char *flags = strchr(str, '='); int err = 1; if (nodelist) { /* NUL-terminate mode or flags string */ *nodelist++ = '\0'; if (nodelist_parse(nodelist, nodes)) goto out; if (!nodes_subset(nodes, node_states[N_MEMORY])) goto out; } else nodes_clear(nodes); if (flags) *flags++ = '\0'; /* terminate mode string */ for (mode = 0; mode < MPOL_MAX; mode++) { if (!strcmp(str, policy_modes[mode])) { break; } } if (mode >= MPOL_MAX) goto out; switch (mode) { case MPOL_PREFERRED: /* * Insist on a nodelist of one node only */ if (nodelist) { char *rest = nodelist; while (isdigit(*rest)) rest++; if (*rest) goto out; } break; case MPOL_INTERLEAVE: /* * Default to online nodes with memory if no nodelist */ if (!nodelist) nodes = node_states[N_MEMORY]; break; case MPOL_LOCAL: /* * Don't allow a nodelist; mpol_new() checks flags */ if (nodelist) goto out; mode = MPOL_PREFERRED; break; case MPOL_DEFAULT: /* * Insist on a empty nodelist */ if (!nodelist) err = 0; goto out; case MPOL_BIND: /* * Insist on a nodelist */ if (!nodelist) goto out; } mode_flags = 0; if (flags) { /* * Currently, we only support two mutually exclusive * mode flags. */ if (!strcmp(flags, "static")) mode_flags |= MPOL_F_STATIC_NODES; else if (!strcmp(flags, "relative")) mode_flags |= MPOL_F_RELATIVE_NODES; else goto out; } new = mpol_new(mode, mode_flags, &nodes); if (IS_ERR(new)) goto out; /* * Save nodes for mpol_to_str() to show the tmpfs mount options * for /proc/mounts, /proc/pid/mounts and /proc/pid/mountinfo. */ if (mode != MPOL_PREFERRED) new->v.nodes = nodes; else if (nodelist) new->v.preferred_node = first_node(nodes); else new->flags |= MPOL_F_LOCAL; /* * Save nodes for contextualization: this will be used to "clone" * the mempolicy in a specific context [cpuset] at a later time. */ new->w.user_nodemask = nodes; err = 0; out: /* Restore string for error message */ if (nodelist) *--nodelist = ':'; if (flags) *--flags = '='; if (!err) *mpol = new; return err; }

Contributors

PersonTokensPropCommitsCommitProp
Lee Schermerhorn32979.47%642.86%
Hugh Dickins266.28%17.14%
Motohiro Kosaki256.04%214.29%
Ravikiran G. Thirumalai163.86%17.14%
Kamezawa Hiroyuki71.69%17.14%
Miao Xie51.21%17.14%
Peter Zijlstra40.97%17.14%
Lai Jiangshan20.48%17.14%
Total414100.00%14100.00%

#endif /* CONFIG_TMPFS */ /** * mpol_to_str - format a mempolicy structure for printing * @buffer: to contain formatted mempolicy string * @maxlen: length of @buffer * @pol: pointer to mempolicy to be formatted * * Convert @pol into a string. If @buffer is too short, truncate the string. * Recommend a @maxlen of at least 32 for the longest mode, "interleave", the * longest flag, "relative", and to display at least a few node ids. */
void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol) { char *p = buffer; nodemask_t nodes = NODE_MASK_NONE; unsigned short mode = MPOL_DEFAULT; unsigned short flags = 0; if (pol && pol != &default_policy && !(pol->flags & MPOL_F_MORON)) { mode = pol->mode; flags = pol->flags; } switch (mode) { case MPOL_DEFAULT: break; case MPOL_PREFERRED: if (flags & MPOL_F_LOCAL) mode = MPOL_LOCAL; else node_set(pol->v.preferred_node, nodes); break; case MPOL_BIND: case MPOL_INTERLEAVE: nodes = pol->v.nodes; break; default: WARN_ON_ONCE(1); snprintf(p, maxlen, "unknown"); return; } p += snprintf(p, maxlen, "%s", policy_modes[mode]); if (flags & MPOL_MODE_FLAGS) { p += snprintf(p, buffer + maxlen - p, "="); /* * Currently, the only defined flags are mutually exclusive */ if (flags & MPOL_F_STATIC_NODES) p += snprintf(p, buffer + maxlen - p, "static"); else if (flags & MPOL_F_RELATIVE_NODES) p += snprintf(p, buffer + maxlen - p, "relative"); } if (!nodes_empty(nodes)) p += scnprintf(p, buffer + maxlen - p, ":%*pbl", nodemask_pr_args(&nodes)); }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes10441.43%646.15%
Christoph Lameter9035.86%17.69%
Lee Schermerhorn5120.32%538.46%
Tejun Heo62.39%17.69%
Total251100.00%13100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
David Rientjes263023.25%208.13%
Christoph Lameter190416.83%2610.57%
Andrew Morton120810.68%72.85%
Lee Schermerhorn119310.55%2510.16%
Mel Gorman8067.13%2510.16%
Miao Xie5685.02%31.22%
Motohiro Kosaki5474.84%135.28%
Naoya Horiguchi4854.29%72.85%
Anton Blanchard2502.21%10.41%
Kirill A. Shutemov1901.68%52.03%
Kamezawa Hiroyuki1631.44%20.81%
Heiko Carstens1571.39%20.81%
Oleg Nesterov1521.34%83.25%
Vlastimil Babka1271.12%41.63%
Hugh Dickins1110.98%83.25%
Andi Kleen1000.88%124.88%
Lai Jiangshan660.58%20.81%
Aneesh Kumar K.V480.42%31.22%
Peter Zijlstra480.42%20.81%
Paul Jackson480.42%41.63%
David Howells370.33%31.22%
MinChan Kim370.33%20.81%
Paul Mundt330.29%20.81%
Bob Liu260.23%20.81%
Larry Woodman250.22%10.41%
Robin Holt250.22%10.41%
Michal Hocko200.18%20.81%
Nicholas Piggin200.18%20.81%
Eric W. Biedermann200.18%10.41%
Chris Salls200.18%10.41%
Liang Chen170.15%10.41%
David P. Quigley160.14%10.41%
Ravikiran G. Thirumalai160.14%10.41%
Mitchel Humpherys140.12%10.41%
Piotr Kwapulinski120.11%10.41%
Rik Van Riel120.11%20.81%
Adrian Bunk110.10%10.41%
Sasha Levin110.10%10.41%
Al Viro110.10%31.22%
Olof Johansson110.10%10.41%
Nathan Zimmer110.10%10.41%
Chris Wright100.09%10.41%
Ingo Molnar90.08%31.22%
Andrea Arcangeli90.08%20.81%
Linus Torvalds80.07%20.81%
Hillf Danton60.05%10.41%
Zeng Zhaoming60.05%10.41%
Tejun Heo60.05%10.41%
Keith Owens50.04%10.41%
Pavel Emelyanov40.04%20.81%
Pekka J Enberg40.04%10.41%
Wanpeng Li40.04%10.41%
Jianguo Wu40.04%20.81%
Dan Carpenter30.03%10.41%
Greg Thelen30.03%10.41%
Matthew Dobson30.03%10.41%
Eric Dumazet30.03%10.41%
Björn Helgaas30.03%10.41%
Steve Longerbeam20.02%10.41%
Fabian Frederick20.02%10.41%
Zhihui Zhang20.02%10.41%
Rasmus Villemoes20.02%20.81%
Joe Perches10.01%10.41%
JoonSoo Kim10.01%10.41%
Justin P. Mattock10.01%10.41%
H Hartley Sweeten10.01%10.41%
Paul Gortmaker10.01%10.41%
Wang Sheng-Hui10.01%10.41%
Alexey Dobriyan10.01%10.41%
Helge Deller10.01%10.41%
Total11312100.00%246100.00%
Directory: mm
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