cregit-Linux how code gets into the kernel

Release 4.16 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);

DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock);


void get_online_mems(void) { percpu_down_read(&mem_hotplug_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner1184.62%150.00%
Vladimir Davydov215.38%150.00%
Total13100.00%2100.00%


void put_online_mems(void) { percpu_up_read(&mem_hotplug_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Thomas Gleixner969.23%150.00%
Vladimir Davydov430.77%150.00%
Total13100.00%2100.00%

bool movable_node_enabled = false; #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; }

Contributors

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

__setup("memhp_default_state=", setup_memhp_default_state);
void mem_hotplug_begin(void) { cpus_read_lock(); percpu_down_write(&mem_hotplug_lock); }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki850.00%133.33%
Vladimir Davydov531.25%133.33%
Thomas Gleixner318.75%133.33%
Total16100.00%3100.00%


void mem_hotplug_done(void) { percpu_up_write(&mem_hotplug_lock); cpus_read_unlock(); }

Contributors

PersonTokensPropCommitsCommitProp
Motohiro Kosaki1062.50%133.33%
Vladimir Davydov318.75%133.33%
Thomas Gleixner318.75%133.33%
Total16100.00%3100.00%

/* add this memory to iomem resource */
static struct resource *register_memory_resource(u64 start, u64 size) { struct resource *res, *conflict; 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; conflict = request_resource_conflict(&iomem_resource, res); if (conflict) { if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) { pr_debug("Device unaddressable memory block " "memory hotplug at %#010llx !\n", (unsigned long long)start); } pr_debug("System RAM resource %pR cannot be added\n", res); kfree(res); return ERR_PTR(-EEXIST); } return res; }

Contributors

PersonTokensPropCommitsCommitProp
Keith Mannthey8460.87%114.29%
Jérôme Glisse3323.91%114.29%
Vitaly Kuznetsov1611.59%114.29%
Yasunori Goto21.45%114.29%
Toshi Kani21.45%228.57%
Björn Helgaas10.72%114.29%
Total138100.00%7100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
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); }

Contributors

PersonTokensPropCommitsCommitProp
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); } }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto5064.94%228.57%
Andrea Arcangeli1620.78%114.29%
Yasuaki Ishimatsu79.09%114.29%
Jiang Liu33.90%228.57%
JoonSoo Kim11.30%114.29%
Total77100.00%7100.00%

#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 = ms->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); }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto15998.76%250.00%
Oscar Salvador10.62%125.00%
Adrian Bunk10.62%125.00%
Total161100.00%4100.00%

#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; 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 = ms->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); }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu11599.14%150.00%
Oscar Salvador10.86%150.00%
Total116100.00%2100.00%

#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); } }

Contributors

PersonTokensPropCommitsCommitProp
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 int __meminit __add_section(int nid, unsigned long phys_start_pfn, struct vmem_altmap *altmap, bool want_memblock) { int ret; int i; if (pfn_valid(phys_start_pfn)) return -EEXIST; ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn, altmap); if (ret < 0) return ret; /* * Make all the pages reserved so that nobody will stumble over half * initialized state. * FIXME: We also have to associate it with a node because page_to_nid * relies on having page with the proper node. */ for (i = 0; i < PAGES_PER_SECTION; i++) { unsigned long pfn = phys_start_pfn + i; struct page *page; if (!pfn_valid(pfn)) continue; page = pfn_to_page(pfn); set_page_node(page, nid); SetPageReserved(page); } if (!want_memblock) return 0; return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko6950.00%222.22%
Dave Hansen4028.99%111.11%
Kamezawa Hiroyuki117.97%111.11%
Christoph Hellwig75.07%111.11%
Gary Hade53.62%111.11%
Yasunori Goto42.90%111.11%
Fan Du10.72%111.11%
Al Viro10.72%111.11%
Total138100.00%9100.00%

/* * 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, unsigned long phys_start_pfn, unsigned long nr_pages, struct vmem_altmap *altmap, bool want_memblock) { unsigned long i; int err = 0; int start_sec, end_sec; /* 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); 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, section_nr_to_pfn(i), altmap, want_memblock); /* * 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; cond_resched(); } vmemmap_populate_print_last(); out: return err; }

Contributors

PersonTokensPropCommitsCommitProp
David Rientjes9458.75%111.11%
Dan J Williams3723.12%111.11%
JoonSoo Kim85.00%111.11%
Michal Hocko85.00%222.22%
Christoph Hellwig74.38%222.22%
Sheng Yong31.88%111.11%
Zhu Guihua31.88%111.11%
Total160100.00%9100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE /* find the smallest valid pfn in the range [start_pfn, end_pfn) */
static unsigned long 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; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu94100.00%2100.00%
Total94100.00%2100.00%

/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
static unsigned long 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; }

Contributors

PersonTokensPropCommitsCommitProp
Yasuaki Ishimatsu105100.00%2100.00%
Total105100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
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; unsigned long flags; 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 Ishimatsu75100.00%1100.00%
Total75100.00%1100.00%


static int __remove_section(struct zone *zone, struct mem_section *ms, unsigned long map_offset, struct vmem_altmap *altmap) { 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((unsigned long)scn_nr); __remove_zone(zone, start_pfn); sparse_remove_one_section(zone, ms, map_offset, altmap); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty5755.88%120.00%
Yasuaki Ishimatsu3231.37%240.00%
Christoph Hellwig76.86%120.00%
Dan J Williams65.88%120.00%
Total102100.00%5100.00%

/** * __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, struct vmem_altmap *altmap) { 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)) { 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, altmap); map_offset = 0; if (ret) break; } set_zone_contiguous(zone); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Badari Pulavarty8038.83%112.50%
Dan J Williams5426.21%112.50%
Toshi Kani3215.53%112.50%
Randy Dunlap157.28%112.50%
JoonSoo Kim104.85%112.50%
Yasuaki Ishimatsu83.88%112.50%
Christoph Hellwig73.40%225.00%
Total206100.00%8100.00%

#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%
Jiang Liu111.11%133.33%
Daniel Kiper111.11%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++; } online_mem_sections(start_pfn, start_pfn + nr_pages); *(unsigned long *)arg = onlined_pages; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki7368.87%240.00%
Dave Hansen2018.87%120.00%
Michal Hocko98.49%120.00%
Daniel Kiper43.77%120.00%
Total106100.00%5100.00%

/* 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%


static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages) { unsigned long old_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(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko6193.85%150.00%
Reza Arbab46.15%150.00%
Total65100.00%2100.00%


static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, unsigned long nr_pages) { unsigned long old_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(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko5889.23%150.00%
Reza Arbab710.77%150.00%
Total65100.00%2100.00%


void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap *altmap) { struct pglist_data *pgdat = zone->zone_pgdat; int nid = pgdat->node_id; unsigned long flags; if (zone_is_empty(zone)) init_currently_empty_zone(zone, start_pfn, nr_pages); clear_zone_contiguous(zone); /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ pgdat_resize_lock(pgdat, &flags); zone_span_writelock(zone); resize_zone_range(zone, start_pfn, nr_pages); zone_span_writeunlock(zone); resize_pgdat_range(pgdat, start_pfn, nr_pages); pgdat_resize_unlock(pgdat, &flags); /* * TODO now we have a visible range of pages which are not associated * with their zone properly. Not nice but set_pfnblock_flags_mask * expects the zone spans the pfn range. All the pages in the range * are reserved so nobody should be touching them so we should be safe */ memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, MEMMAP_HOTPLUG, altmap); set_zone_contiguous(zone); }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko12089.55%250.00%
Reza Arbab75.22%125.00%
Christoph Hellwig75.22%125.00%
Total134100.00%4100.00%

/* * Returns a default kernel memory zone for the given pfn range. * If no kernel zone covers this pfn range it will automatically go * to the ZONE_NORMAL. */
static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, unsigned long nr_pages) { struct pglist_data *pgdat = NODE_DATA(nid); int zid; for (zid = 0; zid <= ZONE_NORMAL; zid++) { struct zone *zone = &pgdat->node_zones[zid]; if (zone_intersects(zone, start_pfn, nr_pages)) return zone; } return &pgdat->node_zones[ZONE_NORMAL]; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko83100.00%3100.00%
Total83100.00%3100.00%


static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, unsigned long nr_pages) { struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); /* * We inherit the existing zone in a simple case where zones do not * overlap in the given range */ if (in_kernel ^ in_movable) return (in_kernel) ? kernel_zone : movable_zone; /* * If the range doesn't belong to any zone or two zones overlap in the * given range then we use movable zone only if movable_node is * enabled because we always online to a kernel zone by default. */ return movable_node_enabled ? movable_zone : kernel_zone; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko98100.00%3100.00%
Total98100.00%3100.00%


struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, unsigned long nr_pages) { if (online_type == MMOP_ONLINE_KERNEL) return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); if (online_type == MMOP_ONLINE_MOVABLE) return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; return default_zone_for_pfn(nid, start_pfn, nr_pages); }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko64100.00%4100.00%
Total64100.00%4100.00%

/* * Associates the given pfn range with the given node and the zone appropriate * for the given online type. */
static struct zone * __meminit move_pfn_range(int online_type, int nid, unsigned long start_pfn, unsigned long nr_pages) { struct zone *zone; zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL); return zone; }

Contributors

PersonTokensPropCommitsCommitProp
Michal Hocko4989.09%240.00%
Christoph Hellwig23.64%120.00%
Reza Arbab23.64%120.00%
Yasuaki Ishimatsu23.64%120.00%
Total55100.00%5100.00%

/* Must be protected by mem_hotplug_begin() or a device_lock */
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; nid = pfn_to_nid(pfn); /* associate pfn range with the zone */ zone = move_pfn_range(online_type, nid, pfn, nr_pages); arg.start_pfn = pfn; arg.nr_pages = nr_pages; node_states_check_changes_online(nr_pages, zone, &arg); 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. */ if (!populated_zone(zone)) { need_zonelists_rebuild = 1; setup_zone_pageset(zone); } ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, online_pages_range); if (ret) { if (need_zonelists_rebuild) zone_pcp_reset(zone); 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); else zone_pcp_update(zone); } 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 Goto8526.98%39.68%
Chen Yucong5015.87%13.23%
Kamezawa Hiroyuki3511.11%412.90%
Cody P Schafer216.67%13.23%
Lai Jiangshan206.35%26.45%
Jiang Liu165.08%39.68%
Wen Congyang154.76%13.23%
Dave Hansen144.44%26.45%
Michal Hocko113.49%39.68%
Vlastimil Babka92.86%26.45%
Haicheng Li92.86%13.23%
Geoff Levand82.54%13.23%
Christoph Lameter61.90%13.23%
Reza Arbab51.59%13.23%
David Shaohua Li51.59%13.23%
Chandra Seetharaman30.95%13.23%
Motohiro Kosaki20.63%26.45%
David Rientjes10.32%13.23%
Total315100.00%31100.00%

#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. * Note that kswapd will init kswapd_classzone_idx properly * when it starts in the near future. */ 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. */ build_all_zonelists(pgdat); /* * 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 Goto8455.26%17.69%
Tang Chen2516.45%323.08%
Gu Zheng149.21%17.69%
Reza Arbab106.58%17.69%
Mel Gorman85.26%215.38%
Kamezawa Hiroyuki53.29%17.69%
Fabian Frederick31.97%17.69%
David Rientjes10.66%17.69%
Jiang Liu10.66%17.69%
Hidetoshi Seto10.66%17.69%
Total152100.00%13100.00%


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); out: mem_hotplug_done(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Minskey Guo6375.00%125.00%
Toshi Kani1821.43%125.00%
Vladimir Davydov22.38%125.00%
David Rientjes11.19%125.00%
Total84100.00%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%


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, NULL, true); if (ret < 0) goto error; /* we online node here. we can't roll back from here. */ node_set_online(nid); if (new_node) { unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; ret = __register_one_node(nid); if (ret) goto register_fail; /* * link memory sections under this node. This is already * done when creatig memory section in register_new_memory * but that depends to have the node registered so offline * nodes have to go through register_node. * TODO clean up this mess. */ ret = link_mem_sections(nid, start_pfn, nr_pages); register_fail: /* * 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 && pgdat) rollback_node_hotadd(nid, pgdat); memblock_remove(start, size); out: mem_hotplug_done(); return ret; }

Contributors

PersonTokensPropCommitsCommitProp
Yasunori Goto10335.40%315.00%
Tang Chen4515.46%210.00%
Michal Hocko3913.40%210.00%
Vitaly Kuznetsov299.97%15.00%
David Vrabel196.53%15.00%
Andi Kleen144.81%15.00%
Andrew Morton124.12%15.00%
Kamezawa Hiroyuki103.44%15.00%
Toshi Kani62.06%15.00%
Nathan Zimmer51.72%15.00%
Vladimir Davydov20.69%15.00%
Christoph Hellwig20.69%15.00%
Gustavo A. R. Silva20.69%15.00%
Al Viro10.34%15.00%
Wen Congyang10.34%15.00%
Dan J Williams10.34%15.00%
Total291100.00%20100.00%

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; }

Contributors

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) { int nid = page_to_nid(page); nodemask_t nmask = node_states[N_MEMORY]; /* * try to allocate from a different node but reuse this node if there * are no other online nodes to be used (e.g. we are offlining a part * of the only existing node) */ node_clear(nid, nmask); if (nodes_empty(nmask)) node_set(nid, nmask); return new_page_nodemask(page, nid, &nmask); }

Contributors

PersonTokensPropCommitsCommitProp
Xishi Qiu4461.97%125.00%
Michal Hocko2332.39%250.00%
Li Zhong45.63%125.00%
Total71100.00%4100.00%

#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; } else if (thp_migration_supported() && PageTransHuge(page)) pfn = page_to_pfn(compound_head(page)) + hpage_nr_pages(page) - 1; 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 Hiroyuki15642.51%15.00%
Naoya Horiguchi10428.34%210.00%
Yisheng Xie287.63%15.00%
Bob Liu225.99%210.00%
Nicholas Piggin113.00%15.00%
Konstantin Khlebnikov113.00%15.00%
Motohiro Kosaki113.00%15.00%
MinChan Kim92.45%15.00%
Mel Gorman41.09%315.00%
Fengguang Wu30.82%15.00%
Xishi Qiu20.54%15.00%
David Rientjes20.54%15.00%
Chen Yucong10.27%15.00%
Hugh Dickins10.27%15.00%
Dave Hansen10.27%15.00%
Lucas De Marchi10.27%15.00%
Total367100.00%20100.00%

/* * 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; }

Contributors

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


static int __init cmdline_parse_movable_node(char *p) { #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP movable_node_enabled = true; #else pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); #endif return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Tang Chen1860.00%266.67%
Michal Hocko1240.00%133.33%
Total30100.00%3100.00%

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; }

Contributors

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); }

Contributors

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 pfn, nr_pages; long offlined_pages; int ret, 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; /* 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; repeat: /* start memory hot removal */ ret = -EINTR; if (signal_pending(current)) goto failed_removal; cond_resched(); lru_add_drain_all(); 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); goto repeat; } /* * 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) goto repeat; 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); build_all_zonelists(NULL); } 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 Hiroyuki22747.10%26.67%
Yasunori Goto8016.60%13.33%
Cody P Schafer234.77%13.33%
Jiang Liu234.77%310.00%
Björn Helgaas193.94%13.33%
Lai Jiangshan183.73%13.33%
David Rientjes163.32%26.67%
Toshi Kani132.70%13.33%
Xishi Qiu132.70%13.33%
Naoya Horiguchi102.07%13.33%
Vlastimil Babka102.07%310.00%
Gerald Schaefer91.87%13.33%
Michal Nazarewicz61.24%13.33%
Wen Congyang30.62%26.67%
Michal Hocko30.62%26.67%
Motohiro Kosaki20.41%26.67%
Chen Yucong20.41%13.33%
MinChan Kim20.41%13.33%
Adam Buchbinder10.21%13.33%
Andrew Morton10.21%13.33%
Christoph Lameter10.21%13.33%
Total482100.00%30100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang23100.00%1100.00%
Total23100.00%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%
Joe Perches11.25%120.00%
Xishi Qiu11.25%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, NULL); try_offline_node(nid); mem_hotplug_done(); }

Contributors

PersonTokensPropCommitsCommitProp
Wen Congyang3129.52%215.38%
Yasuaki Ishimatsu2019.05%215.38%
Toshi Kani1514.29%215.38%
Xishi Qiu1514.29%215.38%
Rafael J. Wysocki1110.48%17.69%
Tang Chen87.62%17.69%
Christoph Hellwig21.90%17.69%
Vladimir Davydov21.90%17.69%
Badari Pulavarty10.95%17.69%
Total105100.00%13100.00%

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

Overall Contributors

PersonTokensPropCommitsCommitProp
Kamezawa Hiroyuki92813.11%136.25%
Yasuaki Ishimatsu92213.02%94.33%
Yasunori Goto73910.44%104.81%
Michal Hocko71610.11%209.62%
Lai Jiangshan5698.04%31.44%
Wen Congyang3434.85%115.29%
Badari Pulavarty2884.07%31.44%
Tang Chen2874.05%83.85%
Toshi Kani2343.31%104.81%
Daniel Kiper1662.34%10.48%
Naoya Horiguchi1562.20%31.44%
Vitaly Kuznetsov1442.03%41.92%
Dave Hansen1231.74%31.44%
David Rientjes1221.72%62.88%
Keith Mannthey1191.68%20.96%
Dan J Williams1011.43%20.96%
Xishi Qiu971.37%62.88%
David Vrabel851.20%10.48%
Minskey Guo630.89%10.48%
Chen Yucong530.75%10.48%
Vladimir Davydov500.71%10.48%
Jiang Liu480.68%73.37%
Cody P Schafer470.66%31.44%
Andrew Banman430.61%10.48%
Reza Arbab420.59%31.44%
Christoph Hellwig410.58%52.40%
Motohiro Kosaki400.57%41.92%
Yisheng Xie390.55%10.48%
Randy Dunlap360.51%20.96%
Jérôme Glisse330.47%10.48%
Thomas Gleixner310.44%10.48%
Bob Liu220.31%20.96%
Andrea Arcangeli220.31%10.48%
Vlastimil Babka220.31%41.92%
Rafael J. Wysocki210.30%31.44%
JoonSoo Kim200.28%20.96%
Björn Helgaas200.28%10.48%
qiuxishi170.24%10.48%
Andi Kleen170.24%10.48%
Andrew Morton170.24%31.44%
Jeremy Fitzhardinge160.23%10.48%
Gu Zheng140.20%10.48%
Mel Gorman120.17%52.40%
zhong jiang110.16%10.48%
Nicholas Piggin110.16%10.48%
Konstantin Khlebnikov110.16%10.48%
MinChan Kim110.16%20.96%
Gerald Schaefer90.13%10.48%
Haicheng Li90.13%10.48%
Geoff Levand80.11%10.48%
Christoph Lameter70.10%20.96%
Chandra Seetharaman60.08%10.48%
Fabian Frederick60.08%10.48%
Michal Nazarewicz60.08%10.48%
Gary Hade50.07%10.48%
David Shaohua Li50.07%10.48%
Nathan Zimmer50.07%10.48%
Nathan Fontenot40.06%10.48%
Adrian Bunk40.06%20.96%
Li Zhong40.06%10.48%
Ingo Molnar30.04%10.48%
Yaowei Bai30.04%10.48%
Sheng Yong30.04%10.48%
Zhu Guihua30.04%10.48%
Fengguang Wu30.04%10.48%
Al Viro30.04%10.48%
Gustavo A. R. Silva20.03%10.48%
Hidetoshi Seto20.03%10.48%
Oscar Salvador20.03%10.48%
Joe Perches10.01%10.48%
Lucas De Marchi10.01%10.48%
Yang Shi10.01%10.48%
Hugh Dickins10.01%10.48%
Fan Du10.01%10.48%
Paul Gortmaker10.01%10.48%
Adam Buchbinder10.01%10.48%
Linus Torvalds10.01%10.48%
Total7079100.00%208100.00%
Directory: mm
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.