Release 4.10 fs/proc/task_mmu.c

Directory: fs/proc
#include <linux/mm.h>
#include <linux/vmacache.h>
#include <linux/hugetlb.h>
#include <linux/huge_mm.h>
#include <linux/mount.h>
#include <linux/seq_file.h>
#include <linux/highmem.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/mempolicy.h>
#include <linux/rmap.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/mmu_notifier.h>
#include <linux/page_idle.h>
#include <linux/shmem_fs.h>

#include <asm/elf.h>
#include <linux/uaccess.h>
#include <asm/tlbflush.h>
#include "internal.h"



void task_mem(struct seq_file *m, struct mm_struct *mm)
{
	unsigned long text, lib, swap, ptes, pmds, anon, file, shmem;
	unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;

	anon = get_mm_counter(mm, MM_ANONPAGES);
	file = get_mm_counter(mm, MM_FILEPAGES);
	shmem = get_mm_counter(mm, MM_SHMEMPAGES);

	/*
         * Note: to minimize their overhead, mm maintains hiwater_vm and
         * hiwater_rss only when about to *lower* total_vm or rss.  Any
         * collector of these hiwater stats must therefore get total_vm
         * and rss too, which will usually be the higher.  Barriers? not
         * worth the effort, such snapshots can always be inconsistent.
         */
	hiwater_vm = total_vm = mm->total_vm;
	if (hiwater_vm < mm->hiwater_vm)
		hiwater_vm = mm->hiwater_vm;
	hiwater_rss = total_rss = anon + file + shmem;
	if (hiwater_rss < mm->hiwater_rss)
		hiwater_rss = mm->hiwater_rss;

	text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
	lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
	swap = get_mm_counter(mm, MM_SWAPENTS);
	ptes = PTRS_PER_PTE * sizeof(pte_t) * atomic_long_read(&mm->nr_ptes);
	pmds = PTRS_PER_PMD * sizeof(pmd_t) * mm_nr_pmds(mm);
	seq_printf(m,
		"VmPeak:\t%8lu kB\n"
		"VmSize:\t%8lu kB\n"
		"VmLck:\t%8lu kB\n"
		"VmPin:\t%8lu kB\n"
		"VmHWM:\t%8lu kB\n"
		"VmRSS:\t%8lu kB\n"
		"RssAnon:\t%8lu kB\n"
		"RssFile:\t%8lu kB\n"
		"RssShmem:\t%8lu kB\n"
		"VmData:\t%8lu kB\n"
		"VmStk:\t%8lu kB\n"
		"VmExe:\t%8lu kB\n"
		"VmLib:\t%8lu kB\n"
		"VmPTE:\t%8lu kB\n"
		"VmPMD:\t%8lu kB\n"
		"VmSwap:\t%8lu kB\n",
		hiwater_vm << (PAGE_SHIFT-10),
		total_vm << (PAGE_SHIFT-10),
		mm->locked_vm << (PAGE_SHIFT-10),
		mm->pinned_vm << (PAGE_SHIFT-10),
		hiwater_rss << (PAGE_SHIFT-10),
		total_rss << (PAGE_SHIFT-10),
		anon << (PAGE_SHIFT-10),
		file << (PAGE_SHIFT-10),
		shmem << (PAGE_SHIFT-10),
		mm->data_vm << (PAGE_SHIFT-10),
		mm->stack_vm << (PAGE_SHIFT-10), text, lib,
		ptes >> 10,
		pmds >> 10,
		swap << (PAGE_SHIFT-10));
	hugetlb_report_usage(m, mm);
}

Contributors
Person Tokens Prop Commits CommitProp
hugh dickins hugh dickins 71 20.94% 1 8.33%
christoph hellwig christoph hellwig 66 19.47% 1 8.33%
jerome marchand jerome marchand 65 19.17% 1 8.33%
william lee irwin iii william lee irwin iii 47 13.86% 3 25.00%
kirill a. shutemov kirill a. shutemov 41 12.09% 1 8.33%
kamezawa hiroyuki kamezawa hiroyuki 20 5.90% 1 8.33%
christoph lameter christoph lameter 11 3.24% 1 8.33%
eric w. biederman eric w. biederman 8 2.36% 1 8.33%
naoya horiguchi naoya horiguchi 7 2.06% 1 8.33%
konstantin khlebnikov konstantin khlebnikov 3 0.88% 1 8.33%
Total 339 100.00% 12 100.00%



unsigned long task_vsize(struct mm_struct *mm)
{
	return PAGE_SIZE * mm->total_vm;
}

Contributors
Person Tokens Prop Commits CommitProp
christoph hellwig christoph hellwig 14 77.78% 1 50.00%
andrew morton andrew morton 4 22.22% 1 50.00%
Total 18 100.00% 2 100.00%



unsigned long task_statm(struct mm_struct *mm,
			 unsigned long *shared, unsigned long *text,
			 unsigned long *data, unsigned long *resident)
{
	*shared = get_mm_counter(mm, MM_FILEPAGES) +
			get_mm_counter(mm, MM_SHMEMPAGES);
	*text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
								>> PAGE_SHIFT;
	*data = mm->data_vm + mm->stack_vm;
	*resident = *shared + get_mm_counter(mm, MM_ANONPAGES);
	return mm->total_vm;
}

Contributors
Person Tokens Prop Commits CommitProp
christoph hellwig christoph hellwig 39 39.39% 1 10.00%
william lee irwin iii william lee irwin iii 25 25.25% 2 20.00%
alexey dobriyan alexey dobriyan 10 10.10% 1 10.00%
hugh dickins hugh dickins 9 9.09% 2 20.00%
jerome marchand jerome marchand 7 7.07% 1 10.00%
christoph lameter christoph lameter 4 4.04% 1 10.00%
konstantin khlebnikov konstantin khlebnikov 3 3.03% 1 10.00%
kamezawa hiroyuki kamezawa hiroyuki 2 2.02% 1 10.00%
Total 99 100.00% 10 100.00%

#ifdef CONFIG_NUMA
/*
 * Save get_task_policy() for show_numa_map().
 */


static void hold_task_mempolicy(struct proc_maps_private *priv)
{
	struct task_struct *task = priv->task;

	task_lock(task);
	priv->task_mempolicy = get_task_policy(task);
	mpol_get(priv->task_mempolicy);
	task_unlock(task);
}
Contributors
Person Tokens Prop Commits CommitProp
kamezawa hiroyuki kamezawa hiroyuki 43 93.48% 1 50.00%
oleg nesterov oleg nesterov 3 6.52% 1 50.00%
Total 46 100.00% 2 100.00%



static void release_task_mempolicy(struct proc_maps_private *priv)
{
	mpol_put(priv->task_mempolicy);
}
Contributors
Person Tokens Prop Commits CommitProp
kamezawa hiroyuki kamezawa hiroyuki 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%

#else


static void hold_task_mempolicy(struct proc_maps_private *priv)
{
}
Contributors
Person Tokens Prop Commits CommitProp
kamezawa hiroyuki kamezawa hiroyuki 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%



static void release_task_mempolicy(struct proc_maps_private *priv)
{
}
Contributors
Person Tokens Prop Commits CommitProp
kamezawa hiroyuki kamezawa hiroyuki 10 100.00% 1 100.00%
Total 10 100.00% 1 100.00%

#endif



static void vma_stop(struct proc_maps_private *priv)
{
	struct mm_struct *mm = priv->mm;

	release_task_mempolicy(priv);
	up_read(&mm->mmap_sem);
	mmput(mm);
}

Contributors
Person Tokens Prop Commits CommitProp
matt mackall matt mackall 30 78.95% 2 40.00%
kamezawa hiroyuki kamezawa hiroyuki 5 13.16% 1 20.00%
oleg nesterov oleg nesterov 2 5.26% 1 20.00%
mauricio lin mauricio lin 1 2.63% 1 20.00%
Total 38 100.00% 5 100.00%


static struct vm_area_struct *

m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma)
{
	if (vma == priv->tail_vma)
		return NULL;
	return vma->vm_next ?: priv->tail_vma;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%



static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma)
{
	if (m->count < m->size)	/* vma is copied successfully */
		m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 46 97.87% 1 50.00%
robert ho robert ho 1 2.13% 1 50.00%
Total 47 100.00% 2 100.00%



static void *m_start(struct seq_file *m, loff_t *ppos)
{
	struct proc_maps_private *priv = m->private;
	unsigned long last_addr = m->version;
	struct mm_struct *mm;
	struct vm_area_struct *vma;
	unsigned int pos = *ppos;

	/* See m_cache_vma(). Zero at the start or after lseek. */
	if (last_addr == -1UL)
		return NULL;

	priv->task = get_proc_task(priv->inode);
	if (!priv->task)
		return ERR_PTR(-ESRCH);

	mm = priv->mm;
	if (!mm || !atomic_inc_not_zero(&mm->mm_users))
		return NULL;

	down_read(&mm->mmap_sem);
	hold_task_mempolicy(priv);
	priv->tail_vma = get_gate_vma(mm);

	if (last_addr) {
		vma = find_vma(mm, last_addr - 1);
		if (vma && vma->vm_start <= last_addr)
			vma = m_next_vma(priv, vma);
		if (vma)
			return vma;
	}

	m->version = 0;
	if (pos < mm->map_count) {
		for (vma = mm->mmap; pos; pos--) {
			m->version = vma->vm_start;
			vma = vma->vm_next;
		}
		return vma;
	}

	/* we do not bother to update m->version in this case */
	if (pos == mm->map_count && priv->tail_vma)
		return priv->tail_vma;

	vma_stop(priv);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 119 47.98% 7 38.89%
matt mackall matt mackall 49 19.76% 1 5.56%
al viro al viro 19 7.66% 2 11.11%
christoph hellwig christoph hellwig 18 7.26% 1 5.56%
ingo molnar ingo molnar 17 6.85% 2 11.11%
robert ho robert ho 12 4.84% 1 5.56%
prasanna meda prasanna meda 7 2.82% 1 5.56%
kamezawa hiroyuki kamezawa hiroyuki 3 1.21% 1 5.56%
eric w. biederman eric w. biederman 2 0.81% 1 5.56%
mauricio lin mauricio lin 2 0.81% 1 5.56%
Total 248 100.00% 18 100.00%



static void *m_next(struct seq_file *m, void *v, loff_t *pos)
{
	struct proc_maps_private *priv = m->private;
	struct vm_area_struct *next;

	(*pos)++;
	next = m_next_vma(priv, v);
	if (!next)
		vma_stop(priv);
	return next;
}

Contributors
Person Tokens Prop Commits CommitProp
matt mackall matt mackall 26 41.94% 2 28.57%
oleg nesterov oleg nesterov 23 37.10% 2 28.57%
david rientjes david rientjes 7 11.29% 1 14.29%
mauricio lin mauricio lin 4 6.45% 1 14.29%
christoph hellwig christoph hellwig 2 3.23% 1 14.29%
Total 62 100.00% 7 100.00%



static void m_stop(struct seq_file *m, void *v)
{
	struct proc_maps_private *priv = m->private;

	if (!IS_ERR_OR_NULL(v))
		vma_stop(priv);
	if (priv->task) {
		put_task_struct(priv->task);
		priv->task = NULL;
	}
}

Contributors
Person Tokens Prop Commits CommitProp
matt mackall matt mackall 35 60.34% 1 16.67%
oleg nesterov oleg nesterov 10 17.24% 2 33.33%
linus torvalds linus torvalds 6 10.34% 1 16.67%
mauricio lin mauricio lin 4 6.90% 1 16.67%
prasanna meda prasanna meda 3 5.17% 1 16.67%
Total 58 100.00% 6 100.00%



static int proc_maps_open(struct inode *inode, struct file *file,
			const struct seq_operations *ops, int psize)
{
	struct proc_maps_private *priv = __seq_open_private(file, ops, psize);

	if (!priv)
		return -ENOMEM;

	priv->inode = inode;
	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
	if (IS_ERR(priv->mm)) {
		int err = PTR_ERR(priv->mm);

		seq_release_private(inode, file);
		return err;
	}

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 62 62.63% 3 33.33%
matt mackall matt mackall 30 30.30% 1 11.11%
christoph hellwig christoph hellwig 3 3.03% 1 11.11%
jan engelhardt jan engelhardt 1 1.01% 1 11.11%
prasanna meda prasanna meda 1 1.01% 1 11.11%
david rientjes david rientjes 1 1.01% 1 11.11%
nick piggin nick piggin 1 1.01% 1 11.11%
Total 99 100.00% 9 100.00%



static int proc_map_release(struct inode *inode, struct file *file)
{
	struct seq_file *seq = file->private_data;
	struct proc_maps_private *priv = seq->private;

	if (priv->mm)
		mmdrop(priv->mm);

	return seq_release_private(inode, file);
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 55 100.00% 1 100.00%
Total 55 100.00% 1 100.00%



static int do_maps_open(struct inode *inode, struct file *file,
			const struct seq_operations *ops)
{
	return proc_maps_open(inode, file, ops,
				sizeof(struct proc_maps_private));
}

Contributors
Person Tokens Prop Commits CommitProp
oleg nesterov oleg nesterov 30 78.95% 1 25.00%
mauricio lin mauricio lin 4 10.53% 1 25.00%
matt mackall matt mackall 4 10.53% 2 50.00%
Total 38 100.00% 4 100.00%

/*
 * Indicate if the VMA is a stack for the given task; for
 * /proc/PID/maps that is the stack of the main task.
 */


static int is_stack(struct proc_maps_private *priv,
		    struct vm_area_struct *vma)
{
	/*
         * We make no effort to guess what a given thread considers to be
         * its "stack".  It's not even well-defined for programs written
         * languages like Go.
         */
	return vma->vm_start <= vma->vm_mm->start_stack &&
		vma->vm_end >= vma->vm_mm->start_stack;
}

Contributors
Person Tokens Prop Commits CommitProp
johannes weiner johannes weiner 21 55.26% 1 33.33%
oleg nesterov oleg nesterov 15 39.47% 1 33.33%
andy lutomirski andy lutomirski 2 5.26% 1 33.33%
Total 38 100.00% 3 100.00%


static void

show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid)
{
	struct mm_struct *mm = vma->vm_mm;
	struct file *file = vma->vm_file;
	struct proc_maps_private *priv = m->private;
	vm_flags_t flags = vma->vm_flags;
	unsigned long ino = 0;
	unsigned long long pgoff = 0;
	unsigned long start, end;
	dev_t dev = 0;
	const char *name = NULL;

	if (file) {
		struct inode *inode = file_inode(vma->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
		pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT;
	}

	/* We don't show the stack guard page in /proc/maps */
	start = vma->vm_start;
	if (stack_guard_page_start(vma, start))
		start += PAGE_SIZE;
	end = vma->vm_end;
	if (stack_guard_page_end(vma, end))
		end -= PAGE_SIZE;

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m, "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
			start,
			end,
			flags & VM_READ ? 'r' : '-',
			flags & VM_WRITE ? 'w' : '-',
			flags & VM_EXEC ? 'x' : '-',
			flags & VM_MAYSHARE ? 's' : 'p',
			pgoff,
			MAJOR(dev), MINOR(dev), ino);

	/*
         * Print the dentry name for named mappings, and a
         * special [heap] marker for the heap:
         */
	if (file) {
		seq_pad(m, ' ');
		seq_file_path(m, file, "\n");
		goto done;
	}

	if (vma->vm_ops && vma->vm_ops->name) {
		name = vma->vm_ops->name(vma);
		if (name)
			goto done;
	}

	name = arch_vma_name(vma);
	if (!name) {
		if (!mm) {
			name = "[vdso]";
			goto done;
		}

		if (vma->vm_start <= mm->brk &&
		    vma->vm_end >= mm->start_brk) {
			name = "[heap]";
			goto done;
		}

		if (is_stack(priv, vma))
			name = "[stack]";
	}

done:
	if (name) {
		seq_pad(m, ' ');
		seq_puts(m, name);
	}
	seq_putc(m, '\n');
}

Contributors
Person Tokens Prop Commits CommitProp
matt mackall matt mackall 180 45.34% 4 20.00%
siddhesh poyarekar siddhesh poyarekar 42 10.58% 1 5.00%
andy lutomirski andy lutomirski 32 8.06% 1 5.00%
david rientjes david rientjes 23 5.79% 1 5.00%
tetsuo handa tetsuo handa 22 5.54% 1 5.00%
mikulas patocka mikulas patocka 22 5.54% 1 5.00%
kamezawa hiroyuki kamezawa hiroyuki 21 5.29% 1 5.00%
linus torvalds linus torvalds 18 4.53% 1 5.00%
mauricio lin mauricio lin 14 3.53% 1 5.00%
stefan bader stefan bader 7 1.76% 1 5.00%
joe korty joe korty 5 1.26% 1 5.00%
johannes weiner johannes weiner 3 0.76% 1 5.00%
al viro al viro 3 0.76% 1 5.00%
aaro koskinen aaro koskinen 2 0.50% 1 5.00%
kosaki motohiro kosaki motohiro 1 0.25% 1 5.00%
miklos szeredi miklos szeredi 1 0.25% 1 5.00%
oleg nesterov oleg nesterov 1 0.25% 1 5.00%
Total 397 100.00% 20 100.00%



static int show_map(struct seq_file *m, void *v, int is_pid)
{
	show_map_vma(m, v, is_pid);
	m_cache_vma(m, v);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
joe korty joe korty 20 54.05% 1 16.67%
oleg nesterov oleg nesterov 8 21.62% 2 33.33%
siddhesh poyarekar siddhesh poyarekar 5 13.51% 1 16.67%
matt mackall matt mackall 4 10.81% 2 33.33%
Total 37 100.00% 6 100.00%



static int show_pid_map(struct seq_file *m, void *v)
{
	return show_map(m, v, 1);
}

Contributors
Person Tokens Prop Commits CommitProp
siddhesh poyarekar siddhesh poyarekar 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static int show_tid_map(struct seq_file *m, void *v)
{
	return show_map(m, v, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
siddhesh poyarekar siddhesh poyarekar 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%


static const struct seq_operations proc_pid_maps_op = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_pid_map
};


static const struct seq_operations proc_tid_maps_op = {
	.start	= m_start,
	.next	= m_next,
	.stop	= m_stop,
	.show	= show_tid_map
};



static int pid_maps_open(struct inode *inode, struct file *file)
{
	return do_maps_open(inode, file, &proc_pid_maps_op);
}

Contributors
Person Tokens Prop Commits CommitProp
matt mackall matt mackall 25 92.59% 2 50.00%
siddhesh poyarekar siddhesh poyarekar 1 3.70% 1 25.00%
david rientjes david rientjes 1 3.70% 1 25.00%
Total 27 100.00% 4 100.00%



static int tid_maps_open(struct inode *inode, struct file *file)
{
	return do_maps_open(inode, file, &proc_tid_maps_op);
}

Contributors
Person Tokens Prop Commits CommitProp
siddhesh poyarekar siddhesh poyarekar 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


const struct file_operations proc_pid_maps_operations = {
	.open		= pid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= proc_map_release,
};


const struct file_operations proc_tid_maps_operations = {
	.open		= tid_maps_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= proc_map_release,
};

/*
 * Proportional Set Size(PSS): my share of RSS.
 *
 * PSS of a process is the count of pages it has in memory, where each
 * page is divided by the number of processes sharing it.  So if a
 * process has 1000 pages all to itself, and 1000 shared with one other
 * process, its PSS will be 1500.
 *
 * To keep (accumulated) division errors low, we adopt a 64bit
 * fixed-point pss counter to minimize division errors. So (pss >>
 * PSS_SHIFT) would be the real byte count.
 *
 * A shift of 12 before division means (assuming 4K page size):
 *      - 1M 3-user-pages add up to 8KB errors;
 *      - supports mapcount up to 2^24, or 16M;
 *      - supports PSS up to 2^52 bytes, or 4PB.
 */

#define PSS_SHIFT 12

#ifdef CONFIG_PROC_PAGE_MONITOR

struct mem_size_stats {
	
unsigned long resident;
	
unsigned long shared_clean;
	
unsigned long shared_dirty;
	
unsigned long private_clean;
	
unsigned long private_dirty;
	
unsigned long referenced;
	
unsigned long anonymous;
	
unsigned long anonymous_thp;
	
unsigned long shmem_thp;
	
unsigned long swap;
	
unsigned long shared_hugetlb;
	
unsigned long private_hugetlb;
	
u64 pss;
	
u64 swap_pss;
	
bool check_shmem_swap;
};



static void smaps_account(struct mem_size_stats *mss, struct page *page,
		bool compound, bool young, bool dirty)
{
	int i, nr = compound ? 1 << compound_order(page) : 1;
	unsigned long size = nr * PAGE_SIZE;

	if (PageAnon(page))
		mss->anonymous += size;

	mss->resident += size;
	/* Accumulate the size in pages that have been accessed. */
	if (young || page_is_young(page) || PageReferenced(page))
		mss->referenced += size;

	/*
         * page_count(page) == 1 guarantees the page is mapped exactly once.
         * If any subpage of the compound page mapped with PTE it would elevate
         * page_count().
         */
	if (page_count(page) == 1) {
		if (dirty || PageDirty(page))
			mss->private_dirty += size;
		else
			mss->private_clean += size;
		mss->pss += (u64)size << PSS_SHIFT;
		return;
	}

	for (i = 0; i < nr; i++, page++) {
		int mapcount = page_mapcount(page);

		if (mapcount >= 2) {
			if (dirty || PageDirty(page))
				mss->shared_dirty += PAGE_SIZE;
			else
				mss->shared_clean += PAGE_SIZE;
			mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
		} else {
			if (dirty || PageDirty(page))
				mss->private_dirty += PAGE_SIZE;
			else
				mss->private_clean += PAGE_SIZE;
			mss->pss += PAGE_SIZE << PSS_SHIFT;
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
kirill a. shutemov kirill a. shutemov 231 97.88% 3 75.00%
vladimir davydov vladimir davydov 5 2.12% 1 25.00%
Total 236 100.00% 4 100.00%

#ifdef CONFIG_SHMEM


static int smaps_pte_hole(unsigned long addr, unsigned long end,
		struct mm_walk *walk)
{
	struct mem_size_stats *mss = walk->private;

	mss->swap += shmem_partial_swap_usage(
			walk->vma->vm_file->f_mapping, addr, end);

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
vlastimil babka vlastimil babka 50 100.00% 2 100.00%
Total 50 100.00% 2 100.00%

#endif



static void smaps_pte_entry(pte_t *pte, unsigned long addr,
		struct mm_walk *walk)
{
	struct mem_size_stats *mss = walk->private;
	struct vm_area_struct *vma = walk->vma;
	struct page *page = NULL;

	if (pte_present(*pte)) {
		page = vm_normal_page(vma, addr, *pte);
	} else if (is_swap_pte(*pte)) {
		swp_entry_t swpent = pte_to_swp_entry(*pte);

		if (!non_swap_entry(swpent)) {
			int mapcount;

			mss->swap += PAGE_SIZE;
			mapcount = swp_swapcount(swpent);
			if (mapcount >= 2) {
				u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT;

				do_div(pss_delta, mapcount);
				mss->swap_pss += pss_delta;
			} else {
				mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT;
			}
		} else if (is_migration_entry(swpent))
			page = migration_entry_to_page(swpent);
	} else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap
							&& pte_none(*pte))) {
		page = find_get_entry(vma->vm_file->f_mapping,
						linear_page_index(vma, addr));
		if (!page)
			return;

		if (radix_tree_exceptional_entry(page))
			mss->swap += PAGE_SIZE;
		else
			put_page(page);

		return;
	}

	if (!page)
		return;

	smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte));
}

Contributors
Person Tokens Prop Commits CommitProp
vlastimil babka vlastimil babka 66 24.81% 2 13.33%
minchan kim minchan kim 58 21.80% 2 13.33%
konstantin khlebnikov konstantin khlebnikov 42 15.79% 1 6.67%
kirill a. shutemov kirill a. shutemov 28 10.53% 3 20.00%
matt mackall matt mackall 23 8.65% 1 6.67%
mauricio lin mauricio lin 19 7.14% 1 6.67%
peter zijlstra peter zijlstra 12 4.51% 1 6.67%
dave hansen dave hansen 9 3.38% 2 13.33%
eric w. biederman eric w. biederman 8 3.01% 1 6.67%
naoya horiguchi naoya horiguchi 1 0.38% 1 6.67%
Total 266 100.00% 15 100.00%

#ifdef CONFIG_TRANSPARENT_HUGEPAGE


static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
		struct mm_walk *walk)
{
	struct mem_size_stats *mss = walk->private;
	struct vm_area_struct *vma = walk->vma;
	struct page *page;

	/* FOLL_DUMP will return -EFAULT on huge zero page */
	page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP);
	if (IS_ERR_OR_NULL(page))
		return;
	if (PageAnon(page))
		mss->anonymous_thp += HPAGE_PMD_SIZE;
	else if (PageSwapBacked(page))
		mss->shmem_thp += HPAGE_PMD_SIZE;
	else if (is_zone_device_page(page))
		/* pass */;
	else
		VM_BUG_ON_PAGE(1, page);
	smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd));
}
Contributors
Person Tokens Prop Commits CommitProp
kirill a. shutemov kirill a. shutemov 96 73.85% 3 30.00%
matt mackall matt mackall 15 11.54% 1 10.00%
dan williams dan williams 10 7.69% 1 10.00%
kosaki motohiro kosaki motohiro 5 3.85% 1 10.00%
mauricio lin mauricio lin 1 0.77% 1 10.00%
christoph hellwig christoph hellwig 1 0.77% 1 10.00%
naoya horiguchi naoya horiguchi 1 0.77% 1 10.00%
eric w. biederman eric w. biederman 1 0.77% 1 10.00%
Total 130 100.00% 10 100.00%

#else


static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr,
		struct mm_walk *walk)
{
}
Contributors
Person Tokens Prop Commits CommitProp
kirill a. shutemov kirill a. shutemov 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%

#endif



static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
			   struct mm_walk *walk)
{
	struct vm_area_struct *vma = walk->vma;
	pte_t *pte;
	spinlock_t *ptl;

	ptl = pmd_trans_huge_lock(pmd, vma);
	if (ptl) {
		smaps_pmd_entry(pmd, addr, walk)
	Person	Tokens	Prop	Commits	CommitProp
hugh dickins	hugh dickins	71	20.94%	1	8.33%
christoph hellwig	christoph hellwig	66	19.47%	1	8.33%
jerome marchand	jerome marchand	65	19.17%	1	8.33%
william lee irwin iii	william lee irwin iii	47	13.86%	3	25.00%
kirill a. shutemov	kirill a. shutemov	41	12.09%	1	8.33%
kamezawa hiroyuki	kamezawa hiroyuki	20	5.90%	1	8.33%
christoph lameter	christoph lameter	11	3.24%	1	8.33%
eric w. biederman	eric w. biederman	8	2.36%	1	8.33%
naoya horiguchi	naoya horiguchi	7	2.06%	1	8.33%
konstantin khlebnikov	konstantin khlebnikov	3	0.88%	1	8.33%
	Total	339	100.00%	12	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/proc/task_mmu.c

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