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![Minchan Kim](/assets/img/avatar_default.png)
Iram reported that compaction's too_many_isolated() loops forever. (http://www.spinics.net/lists/linux-mm/msg08123.html) The meminfo when the situation happened was inactive anon is zero. That's because the system has no memory pressure until then. While all anon pages were in the active lru, compaction could select active lru as well as inactive lru. That's a different thing from vmscan's isolated. So we has been two too_many_isolated. While compaction can isolate pages in both active and inactive, current implementation of too_many_isolated only considers inactive. It made Iram's problem. This patch handles active and inactive fairly. That's because we can't expect where from and how many compaction would isolated pages. This patch changes (nr_isolated > nr_inactive) with nr_isolated > (nr_active + nr_inactive) / 2. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Reported-by: Iram Shahzad <iram.shahzad@jp.fujitsu.com> Acked-by: Mel Gorman <mel@csn.ul.ie> Acked-by: Wu Fengguang <fengguang.wu@intel.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
606 lines
16 KiB
C
606 lines
16 KiB
C
/*
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* linux/mm/compaction.c
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*
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* Memory compaction for the reduction of external fragmentation. Note that
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* this heavily depends upon page migration to do all the real heavy
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* lifting
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*
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* Copyright IBM Corp. 2007-2010 Mel Gorman <mel@csn.ul.ie>
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*/
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#include <linux/swap.h>
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#include <linux/migrate.h>
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#include <linux/compaction.h>
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#include <linux/mm_inline.h>
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#include <linux/backing-dev.h>
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#include <linux/sysctl.h>
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#include <linux/sysfs.h>
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#include "internal.h"
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/*
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* compact_control is used to track pages being migrated and the free pages
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* they are being migrated to during memory compaction. The free_pfn starts
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* at the end of a zone and migrate_pfn begins at the start. Movable pages
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* are moved to the end of a zone during a compaction run and the run
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* completes when free_pfn <= migrate_pfn
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*/
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struct compact_control {
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struct list_head freepages; /* List of free pages to migrate to */
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struct list_head migratepages; /* List of pages being migrated */
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unsigned long nr_freepages; /* Number of isolated free pages */
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unsigned long nr_migratepages; /* Number of pages to migrate */
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unsigned long free_pfn; /* isolate_freepages search base */
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unsigned long migrate_pfn; /* isolate_migratepages search base */
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/* Account for isolated anon and file pages */
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unsigned long nr_anon;
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unsigned long nr_file;
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unsigned int order; /* order a direct compactor needs */
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int migratetype; /* MOVABLE, RECLAIMABLE etc */
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struct zone *zone;
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};
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static unsigned long release_freepages(struct list_head *freelist)
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{
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struct page *page, *next;
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unsigned long count = 0;
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list_for_each_entry_safe(page, next, freelist, lru) {
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list_del(&page->lru);
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__free_page(page);
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count++;
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}
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return count;
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}
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/* Isolate free pages onto a private freelist. Must hold zone->lock */
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static unsigned long isolate_freepages_block(struct zone *zone,
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unsigned long blockpfn,
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struct list_head *freelist)
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{
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unsigned long zone_end_pfn, end_pfn;
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int total_isolated = 0;
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struct page *cursor;
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/* Get the last PFN we should scan for free pages at */
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zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
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end_pfn = min(blockpfn + pageblock_nr_pages, zone_end_pfn);
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/* Find the first usable PFN in the block to initialse page cursor */
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for (; blockpfn < end_pfn; blockpfn++) {
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if (pfn_valid_within(blockpfn))
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break;
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}
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cursor = pfn_to_page(blockpfn);
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/* Isolate free pages. This assumes the block is valid */
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for (; blockpfn < end_pfn; blockpfn++, cursor++) {
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int isolated, i;
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struct page *page = cursor;
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if (!pfn_valid_within(blockpfn))
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continue;
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if (!PageBuddy(page))
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continue;
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/* Found a free page, break it into order-0 pages */
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isolated = split_free_page(page);
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total_isolated += isolated;
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for (i = 0; i < isolated; i++) {
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list_add(&page->lru, freelist);
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page++;
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}
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/* If a page was split, advance to the end of it */
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if (isolated) {
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blockpfn += isolated - 1;
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cursor += isolated - 1;
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}
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}
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return total_isolated;
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}
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/* Returns true if the page is within a block suitable for migration to */
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static bool suitable_migration_target(struct page *page)
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{
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int migratetype = get_pageblock_migratetype(page);
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/* Don't interfere with memory hot-remove or the min_free_kbytes blocks */
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if (migratetype == MIGRATE_ISOLATE || migratetype == MIGRATE_RESERVE)
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return false;
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/* If the page is a large free page, then allow migration */
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if (PageBuddy(page) && page_order(page) >= pageblock_order)
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return true;
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/* If the block is MIGRATE_MOVABLE, allow migration */
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if (migratetype == MIGRATE_MOVABLE)
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return true;
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/* Otherwise skip the block */
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return false;
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}
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/*
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* Based on information in the current compact_control, find blocks
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* suitable for isolating free pages from and then isolate them.
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*/
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static void isolate_freepages(struct zone *zone,
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struct compact_control *cc)
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{
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struct page *page;
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unsigned long high_pfn, low_pfn, pfn;
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unsigned long flags;
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int nr_freepages = cc->nr_freepages;
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struct list_head *freelist = &cc->freepages;
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pfn = cc->free_pfn;
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low_pfn = cc->migrate_pfn + pageblock_nr_pages;
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high_pfn = low_pfn;
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/*
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* Isolate free pages until enough are available to migrate the
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* pages on cc->migratepages. We stop searching if the migrate
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* and free page scanners meet or enough free pages are isolated.
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*/
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spin_lock_irqsave(&zone->lock, flags);
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for (; pfn > low_pfn && cc->nr_migratepages > nr_freepages;
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pfn -= pageblock_nr_pages) {
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unsigned long isolated;
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if (!pfn_valid(pfn))
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continue;
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/*
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* Check for overlapping nodes/zones. It's possible on some
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* configurations to have a setup like
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* node0 node1 node0
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* i.e. it's possible that all pages within a zones range of
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* pages do not belong to a single zone.
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*/
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page = pfn_to_page(pfn);
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if (page_zone(page) != zone)
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continue;
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/* Check the block is suitable for migration */
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if (!suitable_migration_target(page))
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continue;
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/* Found a block suitable for isolating free pages from */
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isolated = isolate_freepages_block(zone, pfn, freelist);
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nr_freepages += isolated;
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/*
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* Record the highest PFN we isolated pages from. When next
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* looking for free pages, the search will restart here as
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* page migration may have returned some pages to the allocator
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*/
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if (isolated)
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high_pfn = max(high_pfn, pfn);
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}
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spin_unlock_irqrestore(&zone->lock, flags);
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/* split_free_page does not map the pages */
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list_for_each_entry(page, freelist, lru) {
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arch_alloc_page(page, 0);
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kernel_map_pages(page, 1, 1);
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}
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cc->free_pfn = high_pfn;
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cc->nr_freepages = nr_freepages;
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}
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/* Update the number of anon and file isolated pages in the zone */
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static void acct_isolated(struct zone *zone, struct compact_control *cc)
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{
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struct page *page;
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unsigned int count[NR_LRU_LISTS] = { 0, };
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list_for_each_entry(page, &cc->migratepages, lru) {
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int lru = page_lru_base_type(page);
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count[lru]++;
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}
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cc->nr_anon = count[LRU_ACTIVE_ANON] + count[LRU_INACTIVE_ANON];
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cc->nr_file = count[LRU_ACTIVE_FILE] + count[LRU_INACTIVE_FILE];
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__mod_zone_page_state(zone, NR_ISOLATED_ANON, cc->nr_anon);
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__mod_zone_page_state(zone, NR_ISOLATED_FILE, cc->nr_file);
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}
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/* Similar to reclaim, but different enough that they don't share logic */
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static bool too_many_isolated(struct zone *zone)
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{
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unsigned long active, inactive, isolated;
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inactive = zone_page_state(zone, NR_INACTIVE_FILE) +
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zone_page_state(zone, NR_INACTIVE_ANON);
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active = zone_page_state(zone, NR_ACTIVE_FILE) +
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zone_page_state(zone, NR_ACTIVE_ANON);
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isolated = zone_page_state(zone, NR_ISOLATED_FILE) +
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zone_page_state(zone, NR_ISOLATED_ANON);
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return isolated > (inactive + active) / 2;
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}
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/*
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* Isolate all pages that can be migrated from the block pointed to by
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* the migrate scanner within compact_control.
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*/
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static unsigned long isolate_migratepages(struct zone *zone,
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struct compact_control *cc)
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{
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unsigned long low_pfn, end_pfn;
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struct list_head *migratelist = &cc->migratepages;
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/* Do not scan outside zone boundaries */
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low_pfn = max(cc->migrate_pfn, zone->zone_start_pfn);
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/* Only scan within a pageblock boundary */
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end_pfn = ALIGN(low_pfn + pageblock_nr_pages, pageblock_nr_pages);
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/* Do not cross the free scanner or scan within a memory hole */
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if (end_pfn > cc->free_pfn || !pfn_valid(low_pfn)) {
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cc->migrate_pfn = end_pfn;
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return 0;
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}
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/*
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* Ensure that there are not too many pages isolated from the LRU
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* list by either parallel reclaimers or compaction. If there are,
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* delay for some time until fewer pages are isolated
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*/
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while (unlikely(too_many_isolated(zone))) {
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congestion_wait(BLK_RW_ASYNC, HZ/10);
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if (fatal_signal_pending(current))
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return 0;
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}
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/* Time to isolate some pages for migration */
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spin_lock_irq(&zone->lru_lock);
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for (; low_pfn < end_pfn; low_pfn++) {
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struct page *page;
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if (!pfn_valid_within(low_pfn))
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continue;
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/* Get the page and skip if free */
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page = pfn_to_page(low_pfn);
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if (PageBuddy(page))
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continue;
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/* Try isolate the page */
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if (__isolate_lru_page(page, ISOLATE_BOTH, 0) != 0)
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continue;
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/* Successfully isolated */
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del_page_from_lru_list(zone, page, page_lru(page));
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list_add(&page->lru, migratelist);
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mem_cgroup_del_lru(page);
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cc->nr_migratepages++;
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/* Avoid isolating too much */
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if (cc->nr_migratepages == COMPACT_CLUSTER_MAX)
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break;
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}
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acct_isolated(zone, cc);
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spin_unlock_irq(&zone->lru_lock);
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cc->migrate_pfn = low_pfn;
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return cc->nr_migratepages;
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}
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/*
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* This is a migrate-callback that "allocates" freepages by taking pages
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* from the isolated freelists in the block we are migrating to.
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*/
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static struct page *compaction_alloc(struct page *migratepage,
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unsigned long data,
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int **result)
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{
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struct compact_control *cc = (struct compact_control *)data;
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struct page *freepage;
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/* Isolate free pages if necessary */
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if (list_empty(&cc->freepages)) {
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isolate_freepages(cc->zone, cc);
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if (list_empty(&cc->freepages))
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return NULL;
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}
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freepage = list_entry(cc->freepages.next, struct page, lru);
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list_del(&freepage->lru);
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cc->nr_freepages--;
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return freepage;
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}
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/*
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* We cannot control nr_migratepages and nr_freepages fully when migration is
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* running as migrate_pages() has no knowledge of compact_control. When
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* migration is complete, we count the number of pages on the lists by hand.
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*/
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static void update_nr_listpages(struct compact_control *cc)
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{
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int nr_migratepages = 0;
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int nr_freepages = 0;
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struct page *page;
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list_for_each_entry(page, &cc->migratepages, lru)
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nr_migratepages++;
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list_for_each_entry(page, &cc->freepages, lru)
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nr_freepages++;
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cc->nr_migratepages = nr_migratepages;
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cc->nr_freepages = nr_freepages;
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}
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static int compact_finished(struct zone *zone,
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struct compact_control *cc)
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{
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unsigned int order;
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unsigned long watermark = low_wmark_pages(zone) + (1 << cc->order);
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if (fatal_signal_pending(current))
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return COMPACT_PARTIAL;
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/* Compaction run completes if the migrate and free scanner meet */
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if (cc->free_pfn <= cc->migrate_pfn)
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return COMPACT_COMPLETE;
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/* Compaction run is not finished if the watermark is not met */
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if (!zone_watermark_ok(zone, cc->order, watermark, 0, 0))
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return COMPACT_CONTINUE;
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if (cc->order == -1)
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return COMPACT_CONTINUE;
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/* Direct compactor: Is a suitable page free? */
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for (order = cc->order; order < MAX_ORDER; order++) {
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/* Job done if page is free of the right migratetype */
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if (!list_empty(&zone->free_area[order].free_list[cc->migratetype]))
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return COMPACT_PARTIAL;
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/* Job done if allocation would set block type */
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if (order >= pageblock_order && zone->free_area[order].nr_free)
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return COMPACT_PARTIAL;
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}
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return COMPACT_CONTINUE;
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}
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static int compact_zone(struct zone *zone, struct compact_control *cc)
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{
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int ret;
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/* Setup to move all movable pages to the end of the zone */
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cc->migrate_pfn = zone->zone_start_pfn;
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cc->free_pfn = cc->migrate_pfn + zone->spanned_pages;
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cc->free_pfn &= ~(pageblock_nr_pages-1);
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migrate_prep_local();
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while ((ret = compact_finished(zone, cc)) == COMPACT_CONTINUE) {
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unsigned long nr_migrate, nr_remaining;
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if (!isolate_migratepages(zone, cc))
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continue;
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nr_migrate = cc->nr_migratepages;
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migrate_pages(&cc->migratepages, compaction_alloc,
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(unsigned long)cc, 0);
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update_nr_listpages(cc);
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nr_remaining = cc->nr_migratepages;
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count_vm_event(COMPACTBLOCKS);
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count_vm_events(COMPACTPAGES, nr_migrate - nr_remaining);
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if (nr_remaining)
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count_vm_events(COMPACTPAGEFAILED, nr_remaining);
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/* Release LRU pages not migrated */
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if (!list_empty(&cc->migratepages)) {
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putback_lru_pages(&cc->migratepages);
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cc->nr_migratepages = 0;
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}
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}
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/* Release free pages and check accounting */
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cc->nr_freepages -= release_freepages(&cc->freepages);
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VM_BUG_ON(cc->nr_freepages != 0);
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return ret;
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}
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static unsigned long compact_zone_order(struct zone *zone,
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int order, gfp_t gfp_mask)
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{
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struct compact_control cc = {
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.nr_freepages = 0,
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.nr_migratepages = 0,
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.order = order,
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.migratetype = allocflags_to_migratetype(gfp_mask),
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.zone = zone,
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};
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INIT_LIST_HEAD(&cc.freepages);
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INIT_LIST_HEAD(&cc.migratepages);
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return compact_zone(zone, &cc);
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}
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int sysctl_extfrag_threshold = 500;
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/**
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* try_to_compact_pages - Direct compact to satisfy a high-order allocation
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* @zonelist: The zonelist used for the current allocation
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* @order: The order of the current allocation
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* @gfp_mask: The GFP mask of the current allocation
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* @nodemask: The allowed nodes to allocate from
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*
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* This is the main entry point for direct page compaction.
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*/
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unsigned long try_to_compact_pages(struct zonelist *zonelist,
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int order, gfp_t gfp_mask, nodemask_t *nodemask)
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{
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enum zone_type high_zoneidx = gfp_zone(gfp_mask);
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int may_enter_fs = gfp_mask & __GFP_FS;
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int may_perform_io = gfp_mask & __GFP_IO;
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unsigned long watermark;
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struct zoneref *z;
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struct zone *zone;
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int rc = COMPACT_SKIPPED;
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/*
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* Check whether it is worth even starting compaction. The order check is
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* made because an assumption is made that the page allocator can satisfy
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* the "cheaper" orders without taking special steps
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*/
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if (order <= PAGE_ALLOC_COSTLY_ORDER || !may_enter_fs || !may_perform_io)
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return rc;
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count_vm_event(COMPACTSTALL);
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/* Compact each zone in the list */
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for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
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nodemask) {
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int fragindex;
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int status;
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/*
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* Watermarks for order-0 must be met for compaction. Note
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* the 2UL. This is because during migration, copies of
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* pages need to be allocated and for a short time, the
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* footprint is higher
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*/
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watermark = low_wmark_pages(zone) + (2UL << order);
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if (!zone_watermark_ok(zone, 0, watermark, 0, 0))
|
|
continue;
|
|
|
|
/*
|
|
* fragmentation index determines if allocation failures are
|
|
* due to low memory or external fragmentation
|
|
*
|
|
* index of -1 implies allocations might succeed depending
|
|
* on watermarks
|
|
* index towards 0 implies failure is due to lack of memory
|
|
* index towards 1000 implies failure is due to fragmentation
|
|
*
|
|
* Only compact if a failure would be due to fragmentation.
|
|
*/
|
|
fragindex = fragmentation_index(zone, order);
|
|
if (fragindex >= 0 && fragindex <= sysctl_extfrag_threshold)
|
|
continue;
|
|
|
|
if (fragindex == -1 && zone_watermark_ok(zone, order, watermark, 0, 0)) {
|
|
rc = COMPACT_PARTIAL;
|
|
break;
|
|
}
|
|
|
|
status = compact_zone_order(zone, order, gfp_mask);
|
|
rc = max(status, rc);
|
|
|
|
if (zone_watermark_ok(zone, order, watermark, 0, 0))
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* Compact all zones within a node */
|
|
static int compact_node(int nid)
|
|
{
|
|
int zoneid;
|
|
pg_data_t *pgdat;
|
|
struct zone *zone;
|
|
|
|
if (nid < 0 || nid >= nr_node_ids || !node_online(nid))
|
|
return -EINVAL;
|
|
pgdat = NODE_DATA(nid);
|
|
|
|
/* Flush pending updates to the LRU lists */
|
|
lru_add_drain_all();
|
|
|
|
for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
|
|
struct compact_control cc = {
|
|
.nr_freepages = 0,
|
|
.nr_migratepages = 0,
|
|
.order = -1,
|
|
};
|
|
|
|
zone = &pgdat->node_zones[zoneid];
|
|
if (!populated_zone(zone))
|
|
continue;
|
|
|
|
cc.zone = zone;
|
|
INIT_LIST_HEAD(&cc.freepages);
|
|
INIT_LIST_HEAD(&cc.migratepages);
|
|
|
|
compact_zone(zone, &cc);
|
|
|
|
VM_BUG_ON(!list_empty(&cc.freepages));
|
|
VM_BUG_ON(!list_empty(&cc.migratepages));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Compact all nodes in the system */
|
|
static int compact_nodes(void)
|
|
{
|
|
int nid;
|
|
|
|
for_each_online_node(nid)
|
|
compact_node(nid);
|
|
|
|
return COMPACT_COMPLETE;
|
|
}
|
|
|
|
/* The written value is actually unused, all memory is compacted */
|
|
int sysctl_compact_memory;
|
|
|
|
/* This is the entry point for compacting all nodes via /proc/sys/vm */
|
|
int sysctl_compaction_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *length, loff_t *ppos)
|
|
{
|
|
if (write)
|
|
return compact_nodes();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sysctl_extfrag_handler(struct ctl_table *table, int write,
|
|
void __user *buffer, size_t *length, loff_t *ppos)
|
|
{
|
|
proc_dointvec_minmax(table, write, buffer, length, ppos);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_SYSFS) && defined(CONFIG_NUMA)
|
|
ssize_t sysfs_compact_node(struct sys_device *dev,
|
|
struct sysdev_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
compact_node(dev->id);
|
|
|
|
return count;
|
|
}
|
|
static SYSDEV_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
|
|
|
|
int compaction_register_node(struct node *node)
|
|
{
|
|
return sysdev_create_file(&node->sysdev, &attr_compact);
|
|
}
|
|
|
|
void compaction_unregister_node(struct node *node)
|
|
{
|
|
return sysdev_remove_file(&node->sysdev, &attr_compact);
|
|
}
|
|
#endif /* CONFIG_SYSFS && CONFIG_NUMA */
|