cregit-Linux how code gets into the kernel

Release 4.11 mm/memory_hotplug.c

Directory: mm
/*
 *  linux/mm/memory_hotplug.c
 *
 *  Copyright (C)
 */

#include <linux/stddef.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/swap.h>
#include <linux/interrupt.h>
#include <linux/pagemap.h>
#include <linux/compiler.h>
#include <linux/export.h>
#include <linux/pagevec.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
#include <linux/cpu.h>
#include <linux/memory.h>
#include <linux/memremap.h>
#include <linux/memory_hotplug.h>
#include <linux/highmem.h>
#include <linux/vmalloc.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/migrate.h>
#include <linux/page-isolation.h>
#include <linux/pfn.h>
#include <linux/suspend.h>
#include <linux/mm_inline.h>
#include <linux/firmware-map.h>
#include <linux/stop_machine.h>
#include <linux/hugetlb.h>
#include <linux/memblock.h>
#include <linux/bootmem.h>
#include <linux/compaction.h>

#include <asm/tlbflush.h>

#include "internal.h"

/*
 * online_page_callback contains pointer to current page onlining function.
 * Initially it is generic_online_page(). If it is required it could be
 * changed by calling set_online_page_callback() for callback registration
 * and restore_online_page_callback() for generic callback restore.
 */

static void generic_online_page(struct page *page);


static online_page_callback_t online_page_callback = generic_online_page;
static DEFINE_MUTEX(online_page_callback_lock);

/* The same as the cpu_hotplug lock, but for memory hotplug. */
static struct {
	
struct task_struct *active_writer;
	
struct mutex lock; /* Synchronizes accesses to refcount, */
	/*
         * Also blocks the new readers during
         * an ongoing mem hotplug operation.
         */
	
int refcount;

#ifdef CONFIG_DEBUG_LOCK_ALLOC
	
struct lockdep_map dep_map;
#endif
} 
mem_hotplug = {
	.active_writer = NULL,
	.lock = __MUTEX_INITIALIZER(mem_hotplug.lock),
	.refcount = 0,
#ifdef CONFIG_DEBUG_LOCK_ALLOC
	.dep_map = {.name = "mem_hotplug.lock" },
#endif
};

/* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */

#define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map)

#define memhp_lock_acquire()      lock_map_acquire(&mem_hotplug.dep_map)

#define memhp_lock_release()      lock_map_release(&mem_hotplug.dep_map)

#ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE

bool memhp_auto_online;
#else

bool memhp_auto_online = true;
#endif

EXPORT_SYMBOL_GPL(memhp_auto_online);


static int __init setup_memhp_default_state(char *str) { if (!strcmp(str, "online")) memhp_auto_online = true; else if (!strcmp(str, "offline")) memhp_auto_online = false; return 1; }

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Vitaly Kuznetsov43100.00%1100.00%
Total43100.00%1100.00%

__setup("memhp_default_state=", setup_memhp_default_state);
void get_online_mems(void) { might_sleep(); if (mem_hotplug.active_writer == current) return; memhp_lock_acquire_read(); mutex_lock(&mem_hotplug.lock); mem_hotplug.refcount++; mutex_unlock(&mem_hotplug.lock); }

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Vladimir Davydov43100.00%1100.00%
Total43100.00%1100.00%


void put_online_mems(void) { if (mem_hotplug.active_writer == current) return; mutex_lock(&mem_hotplug.lock); if (WARN_ON(!mem_hotplug.refcount)) mem_hotplug.refcount++; /* try to fix things up */ if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer)) wake_up_process(mem_hotplug.active_writer); mutex_unlock(&mem_hotplug.lock); memhp_lock_release(); }

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Vladimir Davydov73100.00%1100.00%
Total73100.00%1100.00%

/* Serializes write accesses to mem_hotplug.active_writer. */ static DEFINE_MUTEX(memory_add_remove_lock);
void mem_hotplug_begin(void) { mutex_lock(&memory_add_remove_lock); mem_hotplug.active_writer = current; memhp_lock_acquire(); for (;;) { mutex_lock(&mem_hotplug.lock); if (likely(!mem_hotplug.refcount)) break; __set_current_state(TASK_UNINTERRUPTIBLE); mutex_unlock(&mem_hotplug.lock); schedule(); } }

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PersonTokensPropCommitsCommitProp
Vladimir Davydov4773.44%125.00%
Motohiro Kosaki1117.19%125.00%
Heiko Carstens57.81%125.00%
Dan J Williams11.56%125.00%
Total64100.00%4100.00%


void mem_hotplug_done(void) { mem_hotplug.active_writer = NULL; mutex_unlock(&mem_hotplug.lock); memhp_lock_release(); mutex_unlock(&memory_add_remove_lock); }

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Vladimir Davydov1343.33%133.33%
Motohiro Kosaki1136.67%133.33%
Heiko Carstens620.00%133.33%
Total30100.00%3100.00%

/* add this memory to iomem resource */
static struct resource *register_memory_resource(u64 start, u64 size) { struct resource *res; res = kzalloc(sizeof(struct resource), GFP_KERNEL); if (!res) return ERR_PTR(-ENOMEM); res->name = "System RAM"; res->start = start; res->end = start + size - 1; res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; if (request_resource(&iomem_resource, res) < 0) { pr_debug("System RAM resource %pR cannot be added\n", res); kfree(res); return ERR_PTR(-EEXIST); } return res; }

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PersonTokensPropCommitsCommitProp
Keith Mannthey8980.91%116.67%
Vitaly Kuznetsov1614.55%116.67%
Yasunori Goto21.82%116.67%
Toshi Kani21.82%233.33%
Björn Helgaas10.91%116.67%
Total110100.00%6100.00%


static void release_memory_resource(struct resource *res) { if (!res) return; release_resource(res); kfree(res); return; }

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Keith Mannthey28100.00%1100.00%
Total28100.00%1100.00%

#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
void get_page_bootmem(unsigned long info, struct page *page, unsigned long type) { page->freelist = (void *)type; SetPagePrivate(page); set_page_private(page, info); page_ref_inc(page); }

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Yasunori Goto3680.00%240.00%
Andrea Arcangeli613.33%120.00%
Yasuaki Ishimatsu24.44%120.00%
JoonSoo Kim12.22%120.00%
Total45100.00%5100.00%


void put_page_bootmem(struct page *page) { unsigned long type; type = (unsigned long) page->freelist; BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); if (page_ref_dec_return(page) == 1) { page->freelist = NULL; ClearPagePrivate(page); set_page_private(page, 0); INIT_LIST_HEAD(&page->lru); free_reserved_page(page); } }

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PersonTokensPropCommitsCommitProp
Yasunori Goto5267.53%233.33%
Andrea Arcangeli1620.78%116.67%
Yasuaki Ishimatsu79.09%116.67%
JoonSoo Kim11.30%116.67%
Jiang Liu11.30%116.67%
Total77100.00%6100.00%

#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE #ifndef CONFIG_SPARSEMEM_VMEMMAP
static void register_page_bootmem_info_section(unsigned long start_pfn) { unsigned long *usemap, mapsize, section_nr, i; struct mem_section *ms; struct page *page, *memmap; section_nr = pfn_to_section_nr(start_pfn); ms = __nr_to_section(section_nr); /* Get section's memmap address */ memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); /* * Get page for the memmap's phys address * XXX: need more consideration for sparse_vmemmap... */ page = virt_to_page(memmap); mapsize = sizeof(struct page) * PAGES_PER_SECTION; mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; /* remember memmap's page */ for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, SECTION_INFO); usemap = __nr_to_section(section_nr)->pageblock_flags; page = virt_to_page(usemap); mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, MIX_SECTION_INFO); }

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Yasunori Goto16399.39%266.67%
Adrian Bunk10.61%133.33%
Total164100.00%3100.00%

#else /* CONFIG_SPARSEMEM_VMEMMAP */
static void register_page_bootmem_info_section(unsigned long start_pfn) { unsigned long *usemap, mapsize, section_nr, i; struct mem_section *ms; struct page *page, *memmap; if (!pfn_valid(start_pfn)) return; section_nr = pfn_to_section_nr(start_pfn); ms = __nr_to_section(section_nr); memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); usemap = __nr_to_section(section_nr)->pageblock_flags; page = virt_to_page(usemap); mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; for (i = 0; i < mapsize; i++, page++) get_page_bootmem(section_nr, page, MIX_SECTION_INFO); }

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Yasuaki Ishimatsu128100.00%1100.00%
Total128100.00%1100.00%

#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
void __init register_page_bootmem_info_node(struct pglist_data *pgdat) { unsigned long i, pfn, end_pfn, nr_pages; int node = pgdat->node_id; struct page *page; nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; page = virt_to_page(pgdat); for (i = 0; i < nr_pages; i++, page++) get_page_bootmem(node, page, NODE_INFO); pfn = pgdat->node_start_pfn; end_pfn = pgdat_end_pfn(pgdat); /* register section info */ for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { /* * Some platforms can assign the same pfn to multiple nodes - on * node0 as well as nodeN. To avoid registering a pfn against * multiple nodes we check that this pfn does not already * reside in some other nodes. */ if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) register_page_bootmem_info_section(pfn); } }

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Yasunori Goto10381.10%116.67%
qiuxishi1713.39%116.67%
Cody P Schafer32.36%116.67%
Tang Chen21.57%116.67%
Yang Shi10.79%116.67%
Linus Torvalds10.79%116.67%
Total127100.00%6100.00%

#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { unsigned long old_zone_end_pfn; zone_span_writelock(zone); old_zone_end_pfn = zone_end_pfn(zone); if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) zone->zone_start_pfn = start_pfn; zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - zone->zone_start_pfn; zone_span_writeunlock(zone); }

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Heiko Carstens6688.00%120.00%
Xishi Qiu68.00%240.00%
Tang Chen22.67%120.00%
Fabian Frederick11.33%120.00%
Total75100.00%5100.00%


static void resize_zone(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { zone_span_writelock(zone); if (end_pfn - start_pfn) { zone->zone_start_pfn = start_pfn; zone->spanned_pages = end_pfn - start_pfn; } else { /* * make it consist as free_area_init_core(), * if spanned_pages = 0, then keep start_pfn = 0 */ zone->zone_start_pfn = 0; zone->spanned_pages = 0; } zone_span_writeunlock(zone); }

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Lai Jiangshan67100.00%2100.00%
Total67100.00%2100.00%


static void fix_zone_id(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { enum zone_type zid = zone_idx(zone); int nid = zone->zone_pgdat->node_id; unsigned long pfn; for (pfn = start_pfn; pfn < end_pfn; pfn++) set_page_links(pfn_to_page(pfn), zid, nid, pfn); }

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Lai Jiangshan68100.00%1100.00%
Total68100.00%1100.00%

/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */
static int __ref ensure_zone_is_initialized(struct zone *zone, unsigned long start_pfn, unsigned long num_pages) { if (!zone_is_initialized(zone)) return init_currently_empty_zone(zone, start_pfn, num_pages); return 0; }

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Cody P Schafer41100.00%1100.00%
Total41100.00%1100.00%


static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, unsigned long start_pfn, unsigned long end_pfn) { int ret; unsigned long flags; unsigned long z1_start_pfn; ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); if (ret) return ret; pgdat_resize_lock(z1->zone_pgdat, &flags); /* can't move pfns which are higher than @z2 */ if (end_pfn > zone_end_pfn(z2)) goto out_fail; /* the move out part must be at the left most of @z2 */ if (start_pfn > z2->zone_start_pfn) goto out_fail; /* must included/overlap */ if (end_pfn <= z2->zone_start_pfn) goto out_fail; /* use start_pfn for z1's start_pfn if z1 is empty */ if (!zone_is_empty(z1)) z1_start_pfn = z1->zone_start_pfn; else z1_start_pfn = start_pfn; resize_zone(z1, z1_start_pfn, end_pfn); resize_zone(z2, end_pfn, zone_end_pfn(z2)); pgdat_resize_unlock(z1->zone_pgdat, &flags); fix_zone_id(z1, start_pfn, end_pfn); return 0; out_fail: pgdat_resize_unlock(z1->zone_pgdat, &flags); return -1; }

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Lai Jiangshan17093.41%233.33%
Cody P Schafer73.85%233.33%
Xishi Qiu42.20%116.67%
Jiang Liu10.55%116.67%
Total182100.00%6100.00%


static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, unsigned long start_pfn, unsigned long end_pfn) { int ret; unsigned long flags; unsigned long z2_end_pfn; ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); if (ret) return ret; pgdat_resize_lock(z1->zone_pgdat, &flags); /* can't move pfns which are lower than @z1 */ if (z1->zone_start_pfn > start_pfn) goto out_fail; /* the move out part mast at the right most of @z1 */ if (zone_end_pfn(z1) > end_pfn) goto out_fail; /* must included/overlap */ if (start_pfn >= zone_end_pfn(z1)) goto out_fail; /* use end_pfn for z2's end_pfn if z2 is empty */ if (!zone_is_empty(z2)) z2_end_pfn = zone_end_pfn(z2); else z2_end_pfn = end_pfn; resize_zone(z1, z1->zone_start_pfn, start_pfn); resize_zone(z2, start_pfn, z2_end_pfn); pgdat_resize_unlock(z1->zone_pgdat, &flags); fix_zone_id(z2, start_pfn, end_pfn); return 0; out_fail: pgdat_resize_unlock(z1->zone_pgdat, &flags); return -1; }

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Lai Jiangshan16992.35%240.00%
Cody P Schafer105.46%240.00%
Xishi Qiu42.19%120.00%
Total183100.00%5100.00%


static struct zone * __meminit move_pfn_range(int zone_shift, unsigned long start_pfn, unsigned long end_pfn) { struct zone *zone = page_zone(pfn_to_page(start_pfn)); int ret = 0; if (zone_shift < 0) ret = move_pfn_range_left(zone + zone_shift, zone, start_pfn, end_pfn); else if (zone_shift) ret = move_pfn_range_right(zone, zone + zone_shift, start_pfn, end_pfn); if (ret) return NULL; return zone + zone_shift; }

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Reza Arbab91100.00%1100.00%
Total91100.00%1100.00%


static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, unsigned long end_pfn) { unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat); if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) pgdat->node_start_pfn = start_pfn; pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - pgdat->node_start_pfn; }

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Heiko Carstens5485.71%125.00%
Tang Chen57.94%125.00%
Xishi Qiu34.76%125.00%
Fabian Frederick11.59%125.00%
Total63100.00%4100.00%


static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) { struct pglist_data *pgdat = zone->zone_pgdat; int nr_pages = PAGES_PER_SECTION; int nid = pgdat->node_id; int zone_type; unsigned long flags, pfn; int ret; zone_type = zone - pgdat->node_zones; ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); if (ret) return ret; pgdat_resize_lock(zone->zone_pgdat, &flags); grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, phys_start_pfn + nr_pages); pgdat_resize_unlock(zone->zone_pgdat, &flags); memmap_init_zone(nr_pages, nid, zone_type, phys_start_pfn, MEMMAP_HOTPLUG); /* online_page_range is called later and expects pages reserved */ for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) { if (!pfn_valid(pfn)) continue; SetPageReserved(pfn_to_page(pfn)); } return 0; }

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Dave Hansen5934.71%228.57%
Heiko Carstens5733.53%114.29%
Mel Gorman3721.76%114.29%
Yasunori Goto127.06%114.29%
Cody P Schafer42.35%114.29%
Al Viro10.59%114.29%
Total170100.00%7100.00%


static int __meminit __add_section(int nid, struct zone *zone, unsigned long phys_start_pfn) { int ret; if (pfn_valid(phys_start_pfn)) return -EEXIST; ret = sparse_add_one_section(zone, phys_start_pfn); if (ret < 0) return ret; ret = __add_zone(zone, phys_start_pfn); if (ret < 0) return ret; return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); }

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Dave Hansen5265.00%120.00%
Kamezawa Hiroyuki1113.75%120.00%
Yasunori Goto1113.75%120.00%
Gary Hade56.25%120.00%
Al Viro11.25%120.00%
Total80100.00%5100.00%

/* * Reasonably generic function for adding memory. It is * expected that archs that support memory hotplug will * call this function after deciding the zone to which to * add the new pages. */
int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, unsigned long nr_pages) { unsigned long i; int err = 0; int start_sec, end_sec; struct vmem_altmap *altmap; clear_zone_contiguous(zone); /* during initialize mem_map, align hot-added range to section */ start_sec = pfn_to_section_nr(phys_start_pfn); end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); if (altmap) { /* * Validate altmap is within bounds of the total request */ if (altmap->base_pfn != phys_start_pfn || vmem_altmap_offset(altmap) > nr_pages) { pr_warn_once("memory add fail, invalid altmap\n"); err = -EINVAL; goto out; } altmap->alloc = 0; } for (i = start_sec; i <= end_sec; i++) { err = __add_section(nid, zone, section_nr_to_pfn(i)); /* * EEXIST is finally dealt with by ioresource collision * check. see add_memory() => register_memory_resource() * Warning will be printed if there is collision. */ if (err && (err != -EEXIST)) break; err = 0; } vmemmap_populate_print_last(); out: set_zone_contiguous(zone); return err; }

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David Rientjes10155.80%120.00%
Dan J Williams5630.94%120.00%
JoonSoo Kim189.94%120.00%
Sheng Yong31.66%120.00%
Zhu Guihua31.66%120.00%
Total181100.00%5100.00%

EXPORT_SYMBOL_GPL(__add_pages); #ifdef CONFIG_MEMORY_HOTREMOVE /* find the smallest valid pfn in the range [start_pfn, end_pfn) */
static int find_smallest_section_pfn(int nid, struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { struct mem_section *ms; for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { ms = __pfn_to_section(start_pfn); if (unlikely(!valid_section(ms))) continue; if (unlikely(pfn_to_nid(start_pfn) != nid)) continue; if (zone && zone != page_zone(pfn_to_page(start_pfn))) continue; return start_pfn; } return 0; }

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Yasuaki Ishimatsu93100.00%1100.00%
Total93100.00%1100.00%

/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
static int find_biggest_section_pfn(int nid, struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { struct mem_section *ms; unsigned long pfn; /* pfn is the end pfn of a memory section. */ pfn = end_pfn - 1; for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { ms = __pfn_to_section(pfn); if (unlikely(!valid_section(ms))) continue; if (unlikely(pfn_to_nid(pfn) != nid)) continue; if (zone && zone != page_zone(pfn_to_page(pfn))) continue; return pfn; } return 0; }

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Yasuaki Ishimatsu104100.00%1100.00%
Total104100.00%1100.00%


static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) { unsigned long zone_start_pfn = zone->zone_start_pfn; unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ unsigned long zone_end_pfn = z; unsigned long pfn; struct mem_section *ms; int nid = zone_to_nid(zone); zone_span_writelock(zone); if (zone_start_pfn == start_pfn) { /* * If the section is smallest section in the zone, it need * shrink zone->zone_start_pfn and zone->zone_spanned_pages. * In this case, we find second smallest valid mem_section * for shrinking zone. */ pfn = find_smallest_section_pfn(nid, zone, end_pfn, zone_end_pfn); if (pfn) { zone->zone_start_pfn = pfn; zone->spanned_pages = zone_end_pfn - pfn; } } else if (zone_end_pfn == end_pfn) { /* * If the section is biggest section in the zone, it need * shrink zone->spanned_pages. * In this case, we find second biggest valid mem_section for * shrinking zone. */ pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, start_pfn); if (pfn) zone->spanned_pages = pfn - zone_start_pfn + 1; } /* * The section is not biggest or smallest mem_section in the zone, it * only creates a hole in the zone. So in this case, we need not * change the zone. But perhaps, the zone has only hole data. Thus * it check the zone has only hole or not. */ pfn = zone_start_pfn; for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { ms = __pfn_to_section(pfn); if (unlikely(!valid_section(ms))) continue; if (page_zone(pfn_to_page(pfn)) != zone) continue; /* If the section is current section, it continues the loop */ if (start_pfn == pfn) continue; /* If we find valid section, we have nothing to do */ zone_span_writeunlock(zone); return; } /* The zone has no valid section */ zone->zone_start_pfn = 0; zone->spanned_pages = 0; zone_span_writeunlock(zone); }

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Yasuaki Ishimatsu21695.15%150.00%
Xishi Qiu114.85%150.00%
Total227100.00%2100.00%


static void shrink_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, unsigned long end_pfn) { unsigned long pgdat_start_pfn = pgdat->node_start_pfn; unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ unsigned long pgdat_end_pfn = p; unsigned long pfn; struct mem_section *ms; int nid = pgdat->node_id; if (pgdat_start_pfn == start_pfn) { /* * If the section is smallest section in the pgdat, it need * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. * In this case, we find second smallest valid mem_section * for shrinking zone. */ pfn = find_smallest_section_pfn(nid, NULL, end_pfn, pgdat_end_pfn); if (pfn) { pgdat->node_start_pfn = pfn; pgdat->node_spanned_pages = pgdat_end_pfn - pfn; } } else if (pgdat_end_pfn == end_pfn) { /* * If the section is biggest section in the pgdat, it need * shrink pgdat->node_spanned_pages. * In this case, we find second biggest valid mem_section for * shrinking zone. */ pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, start_pfn); if (pfn) pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; } /* * If the section is not biggest or smallest mem_section in the pgdat, * it only creates a hole in the pgdat. So in this case, we need not * change the pgdat. * But perhaps, the pgdat has only hole data. Thus it check the pgdat * has only hole or not. */ pfn = pgdat_start_pfn; for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { ms = __pfn_to_section(pfn); if (unlikely(!valid_section(ms))) continue; if (pfn_to_nid(pfn) != nid) continue; /* If the section is current section, it continues the loop */ if (start_pfn == pfn) continue; /* If we find valid section, we have nothing to do */ return; } /* The pgdat has no valid section */ pgdat->node_start_pfn = 0; pgdat->node_spanned_pages = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu19794.71%150.00%
Xishi Qiu115.29%150.00%
Total208100.00%2100.00%


static void __remove_zone(struct zone *zone, unsigned long start_pfn) { struct pglist_data *pgdat = zone->zone_pgdat; int nr_pages = PAGES_PER_SECTION; int zone_type; unsigned long flags; zone_type = zone - pgdat->node_zones; pgdat_resize_lock(zone->zone_pgdat, &flags); shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); pgdat_resize_unlock(zone->zone_pgdat, &flags); }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu86100.00%1100.00%
Total86100.00%1100.00%


static int __remove_section(struct zone *zone, struct mem_section *ms, unsigned long map_offset) { unsigned long start_pfn; int scn_nr; int ret = -EINVAL; if (!valid_section(ms)) return ret; ret = unregister_memory_section(ms); if (ret) return ret; scn_nr = __section_nr(ms); start_pfn = section_nr_to_pfn(scn_nr); __remove_zone(zone, start_pfn); sparse_remove_one_section(zone, ms, map_offset); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty5762.64%133.33%
Yasuaki Ishimatsu2830.77%133.33%
Dan J Williams66.59%133.33%
Total91100.00%3100.00%

/** * __remove_pages() - remove sections of pages from a zone * @zone: zone from which pages need to be removed * @phys_start_pfn: starting pageframe (must be aligned to start of a section) * @nr_pages: number of pages to remove (must be multiple of section size) * * Generic helper function to remove section mappings and sysfs entries * for the section of the memory we are removing. Caller needs to make * sure that pages are marked reserved and zones are adjust properly by * calling offline_pages(). */
int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, unsigned long nr_pages) { unsigned long i; unsigned long map_offset = 0; int sections_to_remove, ret = 0; /* In the ZONE_DEVICE case device driver owns the memory region */ if (is_dev_zone(zone)) { struct page *page = pfn_to_page(phys_start_pfn); struct vmem_altmap *altmap; altmap = to_vmem_altmap((unsigned long) page); if (altmap) map_offset = vmem_altmap_offset(altmap); } else { resource_size_t start, size; start = phys_start_pfn << PAGE_SHIFT; size = nr_pages * PAGE_SIZE; ret = release_mem_region_adjustable(&iomem_resource, start, size); if (ret) { resource_size_t endres = start + size - 1; pr_warn("Unable to release resource <%pa-%pa> (%d)\n", &start, &endres, ret); } } clear_zone_contiguous(zone); /* * We can only remove entire sections */ BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); BUG_ON(nr_pages % PAGES_PER_SECTION); sections_to_remove = nr_pages / PAGES_PER_SECTION; for (i = 0; i < sections_to_remove; i++) { unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); map_offset = 0; if (ret) break; } set_zone_contiguous(zone); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty8437.33%116.67%
Dan J Williams7633.78%116.67%
Toshi Kani3214.22%116.67%
Randy Dunlap156.67%116.67%
JoonSoo Kim104.44%116.67%
Yasuaki Ishimatsu83.56%116.67%
Total225100.00%6100.00%

#endif /* CONFIG_MEMORY_HOTREMOVE */
int set_online_page_callback(online_page_callback_t callback) { int rc = -EINVAL; get_online_mems(); mutex_lock(&online_page_callback_lock); if (online_page_callback == generic_online_page) { online_page_callback = callback; rc = 0; } mutex_unlock(&online_page_callback_lock); put_online_mems(); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Kiper3772.55%150.00%
Vladimir Davydov1427.45%150.00%
Total51100.00%2100.00%

EXPORT_SYMBOL_GPL(set_online_page_callback);
int restore_online_page_callback(online_page_callback_t callback) { int rc = -EINVAL; get_online_mems(); mutex_lock(&online_page_callback_lock); if (online_page_callback == callback) { online_page_callback = generic_online_page; rc = 0; } mutex_unlock(&online_page_callback_lock); put_online_mems(); return rc; }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Kiper3772.55%150.00%
Vladimir Davydov1427.45%150.00%
Total51100.00%2100.00%

EXPORT_SYMBOL_GPL(restore_online_page_callback);
void __online_page_set_limits(struct page *page) { }

Contributors

PersonTokensPropCommitsCommitProp
Jeremy Fitzhardinge777.78%133.33%
Daniel Kiper111.11%133.33%
Jiang Liu111.11%133.33%
Total9100.00%3100.00%

EXPORT_SYMBOL_GPL(__online_page_set_limits);
void __online_page_increment_counters(struct page *page) { adjust_managed_page_count(page, 1); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Kiper1058.82%133.33%
Jeremy Fitzhardinge423.53%133.33%
Jiang Liu317.65%133.33%
Total17100.00%3100.00%

EXPORT_SYMBOL_GPL(__online_page_increment_counters);
void __online_page_free(struct page *page) { __free_reserved_page(page); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Kiper960.00%133.33%
Jeremy Fitzhardinge533.33%133.33%
Jiang Liu16.67%133.33%
Total15100.00%3100.00%

EXPORT_SYMBOL_GPL(__online_page_free);
static void generic_online_page(struct page *page) { __online_page_set_limits(page); __online_page_increment_counters(page); __online_page_free(page); }

Contributors

PersonTokensPropCommitsCommitProp
Daniel Kiper26100.00%1100.00%
Total26100.00%1100.00%


static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, void *arg) { unsigned long i; unsigned long onlined_pages = *(unsigned long *)arg; struct page *page; if (PageReserved(pfn_to_page(start_pfn))) for (i = 0; i < nr_pages; i++) { page = pfn_to_page(start_pfn + i); (*online_page_callback)(page); onlined_pages++; } *(unsigned long *)arg = onlined_pages; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki7375.26%250.00%
Dave Hansen2020.62%125.00%
Daniel Kiper44.12%125.00%
Total97100.00%4100.00%

#ifdef CONFIG_MOVABLE_NODE /* * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have * normal memory. */
static bool can_online_high_movable(struct zone *zone) { return true; }

Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan14100.00%1100.00%
Total14100.00%1100.00%

#else /* CONFIG_MOVABLE_NODE */ /* ensure every online node has NORMAL memory */
static bool can_online_high_movable(struct zone *zone) { return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); }

Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan22100.00%1100.00%
Total22100.00%1100.00%

#endif /* CONFIG_MOVABLE_NODE */ /* check which state of node_states will be changed when online memory */
static void node_states_check_changes_online(unsigned long nr_pages, struct zone *zone, struct memory_notify *arg) { int nid = zone_to_nid(zone); enum zone_type zone_last = ZONE_NORMAL; /* * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] * contains nodes which have zones of 0...ZONE_NORMAL, * set zone_last to ZONE_NORMAL. * * If we don't have HIGHMEM nor movable node, * node_states[N_NORMAL_MEMORY] contains nodes which have zones of * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. */ if (N_MEMORY == N_NORMAL_MEMORY) zone_last = ZONE_MOVABLE; /* * if the memory to be online is in a zone of 0...zone_last, and * the zones of 0...zone_last don't have memory before online, we will * need to set the node to node_states[N_NORMAL_MEMORY] after * the memory is online. */ if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) arg->status_change_nid_normal = nid; else arg->status_change_nid_normal = -1; #ifdef CONFIG_HIGHMEM /* * If we have movable node, node_states[N_HIGH_MEMORY] * contains nodes which have zones of 0...ZONE_HIGHMEM, * set zone_last to ZONE_HIGHMEM. * * If we don't have movable node, node_states[N_NORMAL_MEMORY] * contains nodes which have zones of 0...ZONE_MOVABLE, * set zone_last to ZONE_MOVABLE. */ zone_last = ZONE_HIGHMEM; if (N_MEMORY == N_HIGH_MEMORY) zone_last = ZONE_MOVABLE; if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) arg->status_change_nid_high = nid; else arg->status_change_nid_high = -1; #else arg->status_change_nid_high = arg->status_change_nid_normal; #endif /* * if the node don't have memory befor online, we will need to * set the node to node_states[N_MEMORY] after the memory * is online. */ if (!node_state(nid, N_MEMORY)) arg->status_change_nid = nid; else arg->status_change_nid = -1; }

Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan163100.00%2100.00%
Total163100.00%2100.00%


static void node_states_set_node(int node, struct memory_notify *arg) { if (arg->status_change_nid_normal >= 0) node_set_state(node, N_NORMAL_MEMORY); if (arg->status_change_nid_high >= 0) node_set_state(node, N_HIGH_MEMORY); node_set_state(node, N_MEMORY); }

Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan51100.00%2100.00%
Total51100.00%2100.00%


bool zone_can_shift(unsigned long pfn, unsigned long nr_pages, enum zone_type target, int *zone_shift) { struct zone *zone = page_zone(pfn_to_page(pfn)); enum zone_type idx = zone_idx(zone); int i; *zone_shift = 0; if (idx < target) { /* pages must be at end of current zone */ if (pfn + nr_pages != zone_end_pfn(zone)) return false; /* no zones in use between current zone and target */ for (i = idx + 1; i < target; i++) if (zone_is_initialized(zone - idx + i)) return false; } if (target < idx) { /* pages must be at beginning of current zone */ if (pfn != zone->zone_start_pfn) return false; /* no zones in use between current zone and target */ for (i = target + 1; i < idx; i++) if (zone_is_initialized(zone - idx + i)) return false; } *zone_shift = target - idx; return true; }

Contributors

PersonTokensPropCommitsCommitProp
Reza Arbab14487.80%150.00%
Yasuaki Ishimatsu2012.20%150.00%
Total164100.00%2100.00%

/* Must be protected by mem_hotplug_begin() */
int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) { unsigned long flags; unsigned long onlined_pages = 0; struct zone *zone; int need_zonelists_rebuild = 0; int nid; int ret; struct memory_notify arg; int zone_shift = 0; /* * This doesn't need a lock to do pfn_to_page(). * The section can't be removed here because of the * memory_block->state_mutex. */ zone = page_zone(pfn_to_page(pfn)); if ((zone_idx(zone) > ZONE_NORMAL || online_type == MMOP_ONLINE_MOVABLE) && !can_online_high_movable(zone)) return -EINVAL; if (online_type == MMOP_ONLINE_KERNEL) { if (!zone_can_shift(pfn, nr_pages, ZONE_NORMAL, &zone_shift)) return -EINVAL; } else if (online_type == MMOP_ONLINE_MOVABLE) { if (!zone_can_shift(pfn, nr_pages, ZONE_MOVABLE, &zone_shift)) return -EINVAL; } zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages); if (!zone) return -EINVAL; arg.start_pfn = pfn; arg.nr_pages = nr_pages; node_states_check_changes_online(nr_pages, zone, &arg); nid = zone_to_nid(zone); ret = memory_notify(MEM_GOING_ONLINE, &arg); ret = notifier_to_errno(ret); if (ret) goto failed_addition; /* * If this zone is not populated, then it is not in zonelist. * This means the page allocator ignores this zone. * So, zonelist must be updated after online. */ mutex_lock(&zonelists_mutex); if (!populated_zone(zone)) { need_zonelists_rebuild = 1; build_all_zonelists(NULL, zone); } ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, online_pages_range); if (ret) { if (need_zonelists_rebuild) zone_pcp_reset(zone); mutex_unlock(&zonelists_mutex); goto failed_addition; } zone->present_pages += onlined_pages; pgdat_resize_lock(zone->zone_pgdat, &flags); zone->zone_pgdat->node_present_pages += onlined_pages; pgdat_resize_unlock(zone->zone_pgdat, &flags); if (onlined_pages) { node_states_set_node(nid, &arg); if (need_zonelists_rebuild) build_all_zonelists(NULL, NULL); else zone_pcp_update(zone); } mutex_unlock(&zonelists_mutex); init_per_zone_wmark_min(); if (onlined_pages) { kswapd_run(nid); kcompactd_run(nid); } vm_total_pages = nr_free_pagecache_pages(); writeback_set_ratelimit(); if (onlined_pages) memory_notify(MEM_ONLINE, &arg); return 0; failed_addition: pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", (unsigned long long) pfn << PAGE_SHIFT, (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); memory_notify(MEM_CANCEL_ONLINE, &arg); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto9020.41%39.09%
Lai Jiangshan6314.29%39.09%
Chen Yucong5011.34%13.03%
Kamezawa Hiroyuki357.94%412.12%
Reza Arbab327.26%26.06%
Haicheng Li276.12%26.06%
Yasuaki Ishimatsu265.90%13.03%
Cody P Schafer214.76%13.03%
Wen Congyang194.31%13.03%
Jiang Liu173.85%39.09%
Dave Hansen143.17%26.06%
Vlastimil Babka112.49%26.06%
David Rientjes92.04%13.03%
Geoff Levand81.81%13.03%
Christoph Lameter61.36%13.03%
David Shaohua Li51.13%13.03%
Tang Chen30.68%13.03%
Chandra Seetharaman30.68%13.03%
Motohiro Kosaki20.45%26.06%
Total441100.00%33100.00%

#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
static void reset_node_present_pages(pg_data_t *pgdat) { struct zone *z; for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) z->present_pages = 0; pgdat->node_present_pages = 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tang Chen46100.00%1100.00%
Total46100.00%1100.00%

/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) { struct pglist_data *pgdat; unsigned long zones_size[MAX_NR_ZONES] = {0}; unsigned long zholes_size[MAX_NR_ZONES] = {0}; unsigned long start_pfn = PFN_DOWN(start); pgdat = NODE_DATA(nid); if (!pgdat) { pgdat = arch_alloc_nodedata(nid); if (!pgdat) return NULL; arch_refresh_nodedata(nid, pgdat); } else { /* Reset the nr_zones, order and classzone_idx before reuse */ pgdat->nr_zones = 0; pgdat->kswapd_order = 0; pgdat->kswapd_classzone_idx = 0; } /* we can use NODE_DATA(nid) from here */ /* init node's zones as empty zones, we don't have any present pages.*/ free_area_init_node(nid, zones_size, start_pfn, zholes_size); pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); /* * The node we allocated has no zone fallback lists. For avoiding * to access not-initialized zonelist, build here. */ mutex_lock(&zonelists_mutex); build_all_zonelists(pgdat, NULL); mutex_unlock(&zonelists_mutex); /* * zone->managed_pages is set to an approximate value in * free_area_init_core(), which will cause * /sys/device/system/node/nodeX/meminfo has wrong data. * So reset it to 0 before any memory is onlined. */ reset_node_managed_pages(pgdat); /* * When memory is hot-added, all the memory is in offline state. So * clear all zones' present_pages because they will be updated in * online_pages() and offline_pages(). */ reset_node_present_pages(pgdat); return pgdat; }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto8450.60%18.33%
Tang Chen2615.66%325.00%
Gu Zheng148.43%18.33%
David Rientjes127.23%18.33%
Reza Arbab106.02%18.33%
Mel Gorman84.82%18.33%
Kamezawa Hiroyuki63.61%18.33%
Fabian Frederick31.81%18.33%
Jiang Liu21.20%18.33%
Hidetoshi Seto10.60%18.33%
Total166100.00%12100.00%


static void rollback_node_hotadd(int nid, pg_data_t *pgdat) { arch_refresh_nodedata(nid, NULL); free_percpu(pgdat->per_cpu_nodestats); arch_free_nodedata(pgdat); return; }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto2678.79%150.00%
Reza Arbab721.21%150.00%
Total33100.00%2100.00%

/** * try_online_node - online a node if offlined * * called by cpu_up() to online a node without onlined memory. */
int try_online_node(int nid) { pg_data_t *pgdat; int ret; if (node_online(nid)) return 0; mem_hotplug_begin(); pgdat = hotadd_new_pgdat(nid, 0); if (!pgdat) { pr_err("Cannot online node %d due to NULL pgdat\n", nid); ret = -ENOMEM; goto out; } node_set_online(nid); ret = register_one_node(nid); BUG_ON(ret); if (pgdat->node_zonelists->_zonerefs->zone == NULL) { mutex_lock(&zonelists_mutex); build_all_zonelists(NULL, NULL); mutex_unlock(&zonelists_mutex); } out: mem_hotplug_done(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Minskey Guo6353.85%125.00%
Toshi Kani5143.59%125.00%
Vladimir Davydov21.71%125.00%
David Rientjes10.85%125.00%
Total117100.00%4100.00%


static int check_hotplug_memory_range(u64 start, u64 size) { u64 start_pfn = PFN_DOWN(start); u64 nr_pages = size >> PAGE_SHIFT; /* Memory range must be aligned with section */ if ((start_pfn & ~PAGE_SECTION_MASK) || (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", (unsigned long long)start, (unsigned long long)size); return -EINVAL; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Toshi Kani7396.05%150.00%
Fabian Frederick33.95%150.00%
Total76100.00%2100.00%

/* * If movable zone has already been setup, newly added memory should be check. * If its address is higher than movable zone, it should be added as movable. * Without this check, movable zone may overlap with other zone. */
static int should_add_memory_movable(int nid, u64 start, u64 size) { unsigned long start_pfn = start >> PAGE_SHIFT; pg_data_t *pgdat = NODE_DATA(nid); struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE; if (zone_is_empty(movable_zone)) return 0; if (movable_zone->zone_start_pfn <= start_pfn) return 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wang Nan67100.00%1100.00%
Total67100.00%1100.00%


int zone_for_memory(int nid, u64 start, u64 size, int zone_default, bool for_device) { #ifdef CONFIG_ZONE_DEVICE if (for_device) return ZONE_DEVICE; #endif if (should_add_memory_movable(nid, start, size)) return ZONE_MOVABLE; return zone_default; }

Contributors

PersonTokensPropCommitsCommitProp
Wang Nan3469.39%150.00%
Dan J Williams1530.61%150.00%
Total49100.00%2100.00%


static int online_memory_block(struct memory_block *mem, void *arg) { return device_online(&mem->dev); }

Contributors

PersonTokensPropCommitsCommitProp
Vitaly Kuznetsov2083.33%150.00%
Nathan Fontenot416.67%150.00%
Total24100.00%2100.00%

/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
int __ref add_memory_resource(int nid, struct resource *res, bool online) { u64 start, size; pg_data_t *pgdat = NULL; bool new_pgdat; bool new_node; int ret; start = res->start; size = resource_size(res); ret = check_hotplug_memory_range(start, size); if (ret) return ret; { /* Stupid hack to suppress address-never-null warning */ void *p = NODE_DATA(nid); new_pgdat = !p; } mem_hotplug_begin(); /* * Add new range to memblock so that when hotadd_new_pgdat() is called * to allocate new pgdat, get_pfn_range_for_nid() will be able to find * this new range and calculate total pages correctly. The range will * be removed at hot-remove time. */ memblock_add_node(start, size, nid); new_node = !node_online(nid); if (new_node) { pgdat = hotadd_new_pgdat(nid, start); ret = -ENOMEM; if (!pgdat) goto error; } /* call arch's memory hotadd */ ret = arch_add_memory(nid, start, size, false); if (ret < 0) goto error; /* we online node here. we can't roll back from here. */ node_set_online(nid); if (new_node) { ret = register_one_node(nid); /* * If sysfs file of new node can't create, cpu on the node * can't be hot-added. There is no rollback way now. * So, check by BUG_ON() to catch it reluctantly.. */ BUG_ON(ret); } /* create new memmap entry */ firmware_map_add_hotplug(start, start + size, "System RAM"); /* online pages if requested */ if (online) walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, online_memory_block); goto out; error: /* rollback pgdat allocation and others */ if (new_pgdat) rollback_node_hotadd(nid, pgdat); memblock_remove(start, size); out: mem_hotplug_done(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto10441.60%318.75%
Tang Chen4518.00%212.50%
Vitaly Kuznetsov2911.60%16.25%
David Vrabel197.60%16.25%
Andi Kleen145.60%16.25%
Andrew Morton124.80%16.25%
Kamezawa Hiroyuki104.00%16.25%
Toshi Kani62.40%16.25%
Nathan Zimmer52.00%16.25%
Dan J Williams20.80%16.25%
Vladimir Davydov20.80%16.25%
Wen Congyang10.40%16.25%
Al Viro10.40%16.25%
Total250100.00%16100.00%

EXPORT_SYMBOL_GPL(add_memory_resource);
int __ref add_memory(int nid, u64 start, u64 size) { struct resource *res; int ret; res = register_memory_resource(start, size); if (IS_ERR(res)) return PTR_ERR(res); ret = add_memory_resource(nid, res, memhp_auto_online); if (ret < 0) release_memory_resource(res); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
David Vrabel6187.14%133.33%
Vitaly Kuznetsov912.86%266.67%
Total70100.00%3100.00%

EXPORT_SYMBOL_GPL(add_memory); #ifdef CONFIG_MEMORY_HOTREMOVE /* * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy * set and the size of the free page is given by page_order(). Using this, * the function determines if the pageblock contains only free pages. * Due to buddy contraints, a free page at least the size of a pageblock will * be located at the start of the pageblock */
static inline int pageblock_free(struct page *page) { return PageBuddy(page) && page_order(page) >= pageblock_order; }

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PersonTokensPropCommitsCommitProp
Badari Pulavarty25100.00%1100.00%
Total25100.00%1100.00%

/* Return the start of the next active pageblock after a given page */
static struct page *next_active_pageblock(struct page *page) { /* Ensure the starting page is pageblock-aligned */ BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); /* If the entire pageblock is free, move to the end of free page */ if (pageblock_free(page)) { int order; /* be careful. we don't have locks, page_order can be changed.*/ order = page_order(page); if ((order < MAX_ORDER) && (order >= pageblock_order)) return page + (1 << order); } return page + pageblock_nr_pages; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty4761.04%150.00%
Kamezawa Hiroyuki3038.96%150.00%
Total77100.00%2100.00%

/* Checks if this range of memory is likely to be hot-removable. */
bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) { struct page *page = pfn_to_page(start_pfn); struct page *end_page = page + nr_pages; /* Check the starting page of each pageblock within the range */ for (; page < end_page; page = next_active_pageblock(page)) { if (!is_pageblock_removable_nolock(page)) return false; cond_resched(); } /* All pageblocks in the memory block are likely to be hot-removable */ return true; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty6089.55%133.33%
Kamezawa Hiroyuki45.97%133.33%
Yaowei Bai34.48%133.33%
Total67100.00%3100.00%

/* * Confirm all pages in a range [start, end) belong to the same zone. * When true, return its valid [start, end). */
int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, unsigned long *valid_start, unsigned long *valid_end) { unsigned long pfn, sec_end_pfn; unsigned long start, end; struct zone *zone = NULL; struct page *page; int i; for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); pfn < end_pfn; pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { /* Make sure the memory section is present first */ if (!present_section_nr(pfn_to_section_nr(pfn))) continue; for (; pfn < sec_end_pfn && pfn < end_pfn; pfn += MAX_ORDER_NR_PAGES) { i = 0; /* This is just a CONFIG_HOLES_IN_ZONE check.*/ while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) i++; if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) continue; page = pfn_to_page(pfn + i); if (zone && page_zone(page) != zone) return 0; if (!zone) start = pfn + i; zone = page_zone(page); end = pfn + MAX_ORDER_NR_PAGES; } } if (zone) { *valid_start = start; *valid_end = min(end, end_pfn); return 1; } else { return 0; } }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki11250.22%120.00%
Toshi Kani5725.56%240.00%
Andrew Banman4319.28%120.00%
zhong jiang114.93%120.00%
Total223100.00%5100.00%

/* * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, * non-lru movable pages and hugepages). We scan pfn because it's much * easier than scanning over linked list. This function returns the pfn * of the first found movable page if it's found, otherwise 0. */
static unsigned long scan_movable_pages(unsigned long start, unsigned long end) { unsigned long pfn; struct page *page; for (pfn = start; pfn < end; pfn++) { if (pfn_valid(pfn)) { page = pfn_to_page(pfn); if (PageLRU(page)) return pfn; if (__PageMovable(page)) return pfn; if (PageHuge(page)) { if (page_huge_active(page)) return pfn; else pfn = round_up(pfn + 1, 1 << compound_order(page)) - 1; } } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki6656.90%233.33%
Naoya Horiguchi3933.62%233.33%
Yisheng Xie108.62%116.67%
Andrew Morton10.86%116.67%
Total116100.00%6100.00%


static struct page *new_node_page(struct page *page, unsigned long private, int **result) { gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE; int nid = page_to_nid(page); nodemask_t nmask = node_states[N_MEMORY]; struct page *new_page = NULL; /* * TODO: allocate a destination hugepage from a nearest neighbor node, * accordance with memory policy of the user process if possible. For * now as a simple work-around, we use the next node for destination. */ if (PageHuge(page)) return alloc_huge_page_node(page_hstate(compound_head(page)), next_node_in(nid, nmask)); node_clear(nid, nmask); if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) gfp_mask |= __GFP_HIGHMEM; if (!nodes_empty(nmask)) new_page = __alloc_pages_nodemask(gfp_mask, 0, node_zonelist(nid, gfp_mask), &nmask); if (!new_page) new_page = __alloc_pages(gfp_mask, 0, node_zonelist(nid, gfp_mask)); return new_page; }

Contributors

PersonTokensPropCommitsCommitProp
Xishi Qiu14691.25%150.00%
Li Zhong148.75%150.00%
Total160100.00%2100.00%

#define NR_OFFLINE_AT_ONCE_PAGES (256)
static int do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) { unsigned long pfn; struct page *page; int move_pages = NR_OFFLINE_AT_ONCE_PAGES; int not_managed = 0; int ret = 0; LIST_HEAD(source); for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { if (!pfn_valid(pfn)) continue; page = pfn_to_page(pfn); if (PageHuge(page)) { struct page *head = compound_head(page); pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; if (compound_order(head) > PFN_SECTION_SHIFT) { ret = -EBUSY; break; } if (isolate_huge_page(page, &source)) move_pages -= 1 << compound_order(head); continue; } if (!get_page_unless_zero(page)) continue; /* * We can skip free pages. And we can deal with pages on * LRU and non-lru movable pages. */ if (PageLRU(page)) ret = isolate_lru_page(page); else ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); if (!ret) { /* Success */ put_page(page); list_add_tail(&page->lru, &source); move_pages--; if (!__PageMovable(page)) inc_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); } else { #ifdef CONFIG_DEBUG_VM pr_alert("failed to isolate pfn %lx\n", pfn); dump_page(page, "isolation failed"); #endif put_page(page); /* Because we don't have big zone->lock. we should check this again here. */ if (page_count(page)) { not_managed++; ret = -EBUSY; break; } } } if (!list_empty(&source)) { if (not_managed) { putback_movable_pages(&source); goto out; } /* Allocate a new page from the nearest neighbor node */ ret = migrate_pages(&source, new_node_page, NULL, 0, MIGRATE_SYNC, MR_MEMORY_HOTPLUG); if (ret) putback_movable_pages(&source); } out: return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki15646.02%15.26%
Naoya Horiguchi7622.42%15.26%
Yisheng Xie288.26%15.26%
Bob Liu226.49%210.53%
Nicholas Piggin113.24%15.26%
Motohiro Kosaki113.24%15.26%
Konstantin Khlebnikov113.24%15.26%
MinChan Kim92.65%15.26%
Mel Gorman41.18%315.79%
Fengguang Wu30.88%15.26%
Xishi Qiu20.59%15.26%
David Rientjes20.59%15.26%
Hugh Dickins10.29%15.26%
Lucas De Marchi10.29%15.26%
Chen Yucong10.29%15.26%
Dave Hansen10.29%15.26%
Total339100.00%19100.00%

/* * remove from free_area[] and mark all as Reserved. */
static int offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, void *data) { __offline_isolated_pages(start, start + nr_pages); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki30100.00%1100.00%
Total30100.00%1100.00%


static void offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) { walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, offline_isolated_pages_cb); }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki27100.00%2100.00%
Total27100.00%2100.00%

/* * Check all pages in range, recoreded as memory resource, are isolated. */
static int check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, void *data) { int ret; long offlined = *(long *)data; ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); offlined = nr_pages; if (!ret) *(long *)data += offlined; return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki6396.92%150.00%
Wen Congyang23.08%150.00%
Total65100.00%2100.00%


static long check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) { long offlined = 0; int ret; ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, check_pages_isolated_cb); if (ret < 0) offlined = (long)ret; return offlined; }

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PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki54100.00%2100.00%
Total54100.00%2100.00%

#ifdef CONFIG_MOVABLE_NODE /* * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have * normal memory. */
static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) { return true; }

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PersonTokensPropCommitsCommitProp
Lai Jiangshan18100.00%1100.00%
Total18100.00%1100.00%

#else /* CONFIG_MOVABLE_NODE */ /* ensure the node has NORMAL memory if it is still online */
static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) { struct pglist_data *pgdat = zone->zone_pgdat; unsigned long present_pages = 0; enum zone_type zt; for (zt = 0; zt <= ZONE_NORMAL; zt++) present_pages += pgdat->node_zones[zt].present_pages; if (present_pages > nr_pages) return true; present_pages = 0; for (; zt <= ZONE_MOVABLE; zt++) present_pages += pgdat->node_zones[zt].present_pages; /* * we can't offline the last normal memory until all * higher memory is offlined. */ return present_pages == 0; }

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PersonTokensPropCommitsCommitProp
Lai Jiangshan98100.00%1100.00%
Total98100.00%1100.00%

#endif /* CONFIG_MOVABLE_NODE */
static int __init cmdline_parse_movable_node(char *p) { #ifdef CONFIG_MOVABLE_NODE movable_node_enabled = true; #else pr_warn("movable_node option not supported\n"); #endif return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tang Chen30100.00%2100.00%
Total30100.00%2100.00%

early_param("movable_node", cmdline_parse_movable_node); /* check which state of node_states will be changed when offline memory */
static void node_states_check_changes_offline(unsigned long nr_pages, struct zone *zone, struct memory_notify *arg) { struct pglist_data *pgdat = zone->zone_pgdat; unsigned long present_pages = 0; enum zone_type zt, zone_last = ZONE_NORMAL; /* * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] * contains nodes which have zones of 0...ZONE_NORMAL, * set zone_last to ZONE_NORMAL. * * If we don't have HIGHMEM nor movable node, * node_states[N_NORMAL_MEMORY] contains nodes which have zones of * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. */ if (N_MEMORY == N_NORMAL_MEMORY) zone_last = ZONE_MOVABLE; /* * check whether node_states[N_NORMAL_MEMORY] will be changed. * If the memory to be offline is in a zone of 0...zone_last, * and it is the last present memory, 0...zone_last will * become empty after offline , thus we can determind we will * need to clear the node from node_states[N_NORMAL_MEMORY]. */ for (zt = 0; zt <= zone_last; zt++) present_pages += pgdat->node_zones[zt].present_pages; if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) arg->status_change_nid_normal = zone_to_nid(zone); else arg->status_change_nid_normal = -1; #ifdef CONFIG_HIGHMEM /* * If we have movable node, node_states[N_HIGH_MEMORY] * contains nodes which have zones of 0...ZONE_HIGHMEM, * set zone_last to ZONE_HIGHMEM. * * If we don't have movable node, node_states[N_NORMAL_MEMORY] * contains nodes which have zones of 0...ZONE_MOVABLE, * set zone_last to ZONE_MOVABLE. */ zone_last = ZONE_HIGHMEM; if (N_MEMORY == N_HIGH_MEMORY) zone_last = ZONE_MOVABLE; for (; zt <= zone_last; zt++) present_pages += pgdat->node_zones[zt].present_pages; if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) arg->status_change_nid_high = zone_to_nid(zone); else arg->status_change_nid_high = -1; #else arg->status_change_nid_high = arg->status_change_nid_normal; #endif /* * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE */ zone_last = ZONE_MOVABLE; /* * check whether node_states[N_HIGH_MEMORY] will be changed * If we try to offline the last present @nr_pages from the node, * we can determind we will need to clear the node from * node_states[N_HIGH_MEMORY]. */ for (; zt <= zone_last; zt++) present_pages += pgdat->node_zones[zt].present_pages; if (nr_pages >= present_pages) arg->status_change_nid = zone_to_nid(zone); else arg->status_change_nid = -1; }

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PersonTokensPropCommitsCommitProp
Lai Jiangshan240100.00%2100.00%
Total240100.00%2100.00%


static void node_states_clear_node(int node, struct memory_notify *arg) { if (arg->status_change_nid_normal >= 0) node_clear_state(node, N_NORMAL_MEMORY); if ((N_MEMORY != N_NORMAL_MEMORY) && (arg->status_change_nid_high >= 0)) node_clear_state(node, N_HIGH_MEMORY); if ((N_MEMORY != N_HIGH_MEMORY) && (arg->status_change_nid >= 0)) node_clear_state(node, N_MEMORY); }

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PersonTokensPropCommitsCommitProp
Lai Jiangshan75100.00%2100.00%
Total75100.00%2100.00%


static int __ref __offline_pages(unsigned long start_pfn, unsigned long end_pfn, unsigned long timeout) { unsigned long pfn, nr_pages, expire; long offlined_pages; int ret, drain, retry_max, node; unsigned long flags; unsigned long valid_start, valid_end; struct zone *zone; struct memory_notify arg; /* at least, alignment against pageblock is necessary */ if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) return -EINVAL; if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) return -EINVAL; /* This makes hotplug much easier...and readable. we assume this for now. .*/ if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) return -EINVAL; zone = page_zone(pfn_to_page(valid_start)); node = zone_to_nid(zone); nr_pages = end_pfn - start_pfn; if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) return -EINVAL; /* set above range as isolated */ ret = start_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE, true); if (ret) return ret; arg.start_pfn = start_pfn; arg.nr_pages = nr_pages; node_states_check_changes_offline(nr_pages, zone, &arg); ret = memory_notify(MEM_GOING_OFFLINE, &arg); ret = notifier_to_errno(ret); if (ret) goto failed_removal; pfn = start_pfn; expire = jiffies + timeout; drain = 0; retry_max = 5; repeat: /* start memory hot removal */ ret = -EAGAIN; if (time_after(jiffies, expire)) goto failed_removal; ret = -EINTR; if (signal_pending(current)) goto failed_removal; ret = 0; if (drain) { lru_add_drain_all(); cond_resched(); drain_all_pages(zone); } pfn = scan_movable_pages(start_pfn, end_pfn); if (pfn) { /* We have movable pages */ ret = do_migrate_range(pfn, end_pfn); if (!ret) { drain = 1; goto repeat; } else { if (ret < 0) if (--retry_max == 0) goto failed_removal; yield(); drain = 1; goto repeat; } } /* drain all zone's lru pagevec, this is asynchronous... */ lru_add_drain_all(); yield(); /* drain pcp pages, this is synchronous. */ drain_all_pages(zone); /* * dissolve free hugepages in the memory block before doing offlining * actually in order to make hugetlbfs's object counting consistent. */ ret = dissolve_free_huge_pages(start_pfn, end_pfn); if (ret) goto failed_removal; /* check again */ offlined_pages = check_pages_isolated(start_pfn, end_pfn); if (offlined_pages < 0) { ret = -EBUSY; goto failed_removal; } pr_info("Offlined Pages %ld\n", offlined_pages); /* Ok, all of our target is isolated. We cannot do rollback at this point. */ offline_isolated_pages(start_pfn, end_pfn); /* reset pagetype flags and makes migrate type to be MOVABLE */ undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); /* removal success */ adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); zone->present_pages -= offlined_pages; pgdat_resize_lock(zone->zone_pgdat, &flags); zone->zone_pgdat->node_present_pages -= offlined_pages; pgdat_resize_unlock(zone->zone_pgdat, &flags); init_per_zone_wmark_min(); if (!populated_zone(zone)) { zone_pcp_reset(zone); mutex_lock(&zonelists_mutex); build_all_zonelists(NULL, NULL); mutex_unlock(&zonelists_mutex); } else zone_pcp_update(zone); node_states_clear_node(node, &arg); if (arg.status_change_nid >= 0) { kswapd_stop(node); kcompactd_stop(node); } vm_total_pages = nr_free_pagecache_pages(); writeback_set_ratelimit(); memory_notify(MEM_OFFLINE, &arg); return 0; failed_removal: pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", (unsigned long long) start_pfn << PAGE_SHIFT, ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); memory_notify(MEM_CANCEL_OFFLINE, &arg); /* pushback to free area */ undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki33453.18%26.90%
Yasunori Goto8112.90%13.45%
Lai Jiangshan355.57%26.90%
Xishi Qiu274.30%13.45%
Jiang Liu233.66%310.34%
Cody P Schafer233.66%13.45%
David Rientjes203.18%26.90%
Björn Helgaas193.03%13.45%
Toshi Kani132.07%13.45%
Vlastimil Babka132.07%310.34%
Naoya Horiguchi101.59%13.45%
Gerald Schaefer91.43%13.45%
Michal Nazarewicz60.96%13.45%
Wen Congyang30.48%26.90%
Adam Buchbinder30.48%13.45%
MinChan Kim20.32%13.45%
Motohiro Kosaki20.32%26.90%
Christoph Lameter20.32%13.45%
Chen Yucong20.32%13.45%
Andrew Morton10.16%13.45%
Total628100.00%29100.00%

/* Must be protected by mem_hotplug_begin() */
int offline_pages(unsigned long start_pfn, unsigned long nr_pages) { return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); }

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PersonTokensPropCommitsCommitProp
Wen Congyang27100.00%1100.00%
Total27100.00%1100.00%

#endif /* CONFIG_MEMORY_HOTREMOVE */ /** * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) * @start_pfn: start pfn of the memory range * @end_pfn: end pfn of the memory range * @arg: argument passed to func * @func: callback for each memory section walked * * This function walks through all present mem sections in range * [start_pfn, end_pfn) and call func on each mem section. * * Returns the return value of func. */
int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, void *arg, int (*func)(struct memory_block *, void *)) { struct memory_block *mem = NULL; struct mem_section *section; unsigned long pfn, section_nr; int ret; for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { section_nr = pfn_to_section_nr(pfn); if (!present_section_nr(section_nr)) continue; section = __nr_to_section(section_nr); /* same memblock? */ if (mem) if ((section_nr >= mem->start_section_nr) && (section_nr <= mem->end_section_nr)) continue; mem = find_memory_block_hinted(section, mem); if (!mem) continue; ret = func(mem, arg); if (ret) { kobject_put(&mem->dev.kobj); return ret; } } if (mem) kobject_put(&mem->dev.kobj); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang16493.71%375.00%
Badari Pulavarty116.29%125.00%
Total175100.00%4100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE
static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) { int ret = !is_memblock_offlined(mem); if (unlikely(ret)) { phys_addr_t beginpa, endpa; beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", &beginpa, &endpa); } return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu3442.50%120.00%
Wen Congyang2328.75%120.00%
Randy Dunlap2126.25%120.00%
Xishi Qiu11.25%120.00%
Joe Perches11.25%120.00%
Total80100.00%5100.00%


static int check_cpu_on_node(pg_data_t *pgdat) { int cpu; for_each_present_cpu(cpu) { if (cpu_to_node(cpu) == pgdat->node_id) /* * the cpu on this node isn't removed, and we can't * offline this node. */ return -EBUSY; } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tang Chen3694.74%150.00%
Toshi Kani25.26%150.00%
Total38100.00%2100.00%


static void unmap_cpu_on_node(pg_data_t *pgdat) { #ifdef CONFIG_ACPI_NUMA int cpu; for_each_possible_cpu(cpu) if (cpu_to_node(cpu) == pgdat->node_id) numa_clear_node(cpu); #endif }

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang3694.74%150.00%
Toshi Kani25.26%150.00%
Total38100.00%2100.00%


static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) { int ret; ret = check_cpu_on_node(pgdat); if (ret) return ret; /* * the node will be offlined when we come here, so we can clear * the cpu_to_node() now. */ unmap_cpu_on_node(pgdat); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang2877.78%150.00%
Toshi Kani822.22%150.00%
Total36100.00%2100.00%

/** * try_offline_node * * Offline a node if all memory sections and cpus of the node are removed. * * NOTE: The caller must call lock_device_hotplug() to serialize hotplug * and online/offline operations before this call. */
void try_offline_node(int nid) { pg_data_t *pgdat = NODE_DATA(nid); unsigned long start_pfn = pgdat->node_start_pfn; unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; unsigned long pfn; for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { unsigned long section_nr = pfn_to_section_nr(pfn); if (!present_section_nr(section_nr)) continue; if (pfn_to_nid(pfn) != nid) continue; /* * some memory sections of this node are not removed, and we * can't offline node now. */ return; } if (check_and_unmap_cpu_on_node(pgdat)) return; /* * all memory/cpu of this node are removed, we can offline this * node now. */ node_set_offline(nid); unregister_one_node(nid); }

Contributors

PersonTokensPropCommitsCommitProp
Tang Chen9187.50%125.00%
Wen Congyang1211.54%250.00%
Toshi Kani10.96%125.00%
Total104100.00%4100.00%

EXPORT_SYMBOL(try_offline_node); /** * remove_memory * * NOTE: The caller must call lock_device_hotplug() to serialize hotplug * and online/offline operations before this call, as required by * try_offline_node(). */
void __ref remove_memory(int nid, u64 start, u64 size) { int ret; BUG_ON(check_hotplug_memory_range(start, size)); mem_hotplug_begin(); /* * All memory blocks must be offlined before removing memory. Check * whether all memory blocks in question are offline and trigger a BUG() * if this is not the case. */ ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, check_memblock_offlined_cb); if (ret) BUG(); /* remove memmap entry */ firmware_map_remove(start, start + size, "System RAM"); memblock_free(start, size); memblock_remove(start, size); arch_remove_memory(start, size); try_offline_node(nid); mem_hotplug_done(); }

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang3130.10%216.67%
Yasuaki Ishimatsu2019.42%216.67%
Xishi Qiu1514.56%216.67%
Toshi Kani1514.56%216.67%
Rafael J. Wysocki1110.68%18.33%
Tang Chen87.77%18.33%
Vladimir Davydov21.94%18.33%
Badari Pulavarty10.97%18.33%
Total103100.00%12100.00%

EXPORT_SYMBOL_GPL(remove_memory); #endif /* CONFIG_MEMORY_HOTREMOVE */

Overall Contributors

PersonTokensPropCommitsCommitProp
Lai Jiangshan127115.05%63.09%
Kamezawa Hiroyuki103712.28%136.70%
Yasuaki Ishimatsu98411.65%73.61%
Yasunori Goto7719.13%105.15%
Wen Congyang3514.16%115.67%
Tang Chen3163.74%115.67%
Vladimir Davydov2963.50%10.52%
Badari Pulavarty2923.46%31.55%
Reza Arbab2843.36%31.55%
Toshi Kani2673.16%105.15%
Xishi Qiu2302.72%73.61%
Heiko Carstens1952.31%21.03%
Dave Hansen1942.30%42.06%
Daniel Kiper1661.97%10.52%
Dan J Williams1591.88%31.55%
David Rientjes1591.88%63.09%
Vitaly Kuznetsov1441.70%42.06%
Naoya Horiguchi1281.52%21.03%
Keith Mannthey1241.47%21.03%
Cody P Schafer1091.29%63.09%
Wang Nan1021.21%10.52%
David Vrabel851.01%10.52%
Minskey Guo630.75%10.52%
Chen Yucong530.63%10.52%
Mel Gorman490.58%52.58%
Jiang Liu490.58%84.12%
Motohiro Kosaki440.52%42.06%
Andrew Banman430.51%10.52%
Yisheng Xie390.46%10.52%
Randy Dunlap360.43%21.03%
JoonSoo Kim300.36%21.03%
Vlastimil Babka270.32%42.06%
Haicheng Li270.32%21.03%
Bob Liu220.26%21.03%
Andrea Arcangeli220.26%10.52%
Björn Helgaas200.24%10.52%
Rafael J. Wysocki200.24%31.55%
Andi Kleen170.20%10.52%
qiuxishi170.20%10.52%
Andrew Morton170.20%31.55%
Jeremy Fitzhardinge160.19%10.52%
Li Zhong140.17%10.52%
Gu Zheng140.17%10.52%
Nicholas Piggin110.13%10.52%
MinChan Kim110.13%21.03%
zhong jiang110.13%10.52%
Konstantin Khlebnikov110.13%10.52%
Gerald Schaefer90.11%10.52%
Fabian Frederick80.09%21.03%
Christoph Lameter80.09%21.03%
Geoff Levand80.09%10.52%
Michal Nazarewicz60.07%10.52%
Chandra Seetharaman60.07%10.52%
Nathan Zimmer50.06%10.52%
David Shaohua Li50.06%10.52%
Gary Hade50.06%10.52%
Adrian Bunk40.05%21.03%
Nathan Fontenot40.05%10.52%
Al Viro40.05%10.52%
Sheng Yong30.04%10.52%
Ingo Molnar30.04%10.52%
Adam Buchbinder30.04%10.52%
Zhu Guihua30.04%10.52%
Fengguang Wu30.04%10.52%
Yaowei Bai30.04%10.52%
Hidetoshi Seto20.02%10.52%
Paul Gortmaker10.01%10.52%
Santosh Shilimkar10.01%10.52%
Joe Perches10.01%10.52%
Hugh Dickins10.01%10.52%
Lucas De Marchi10.01%10.52%
Linus Torvalds10.01%10.52%
Yang Shi10.01%10.52%
Total8446100.00%194100.00%
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