The patch titled Subject: memory-hotplug: fix kswapd looping forever problem has been added to the -mm tree. Its filename is memory-hotplug-fix-kswapd-looping-forever-problem.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Minchan Kim <minchan@xxxxxxxxxx> Subject: memory-hotplug: fix kswapd looping forever problem When hotplug offlining happens on zone A, it starts to mark freed page as MIGRATE_ISOLATE type in buddy for preventing further allocation. (MIGRATE_ISOLATE is very irony type because it's apparently on buddy but we can't allocate them). When the memory shortage happens during hotplug offlining, current task starts to reclaim, then wake up kswapd. Kswapd checks watermark, then go sleep because current zone_watermark_ok_safe doesn't consider MIGRATE_ISOLATE freed page count. Current task continue to reclaim in direct reclaim path without kswapd's helping. The problem is that zone->all_unreclaimable is set by only kswapd so that current task would be looping forever like below. __alloc_pages_slowpath restart: wake_all_kswapd rebalance: __alloc_pages_direct_reclaim do_try_to_free_pages if global_reclaim && !all_unreclaimable return 1; /* It means we did did_some_progress */ skip __alloc_pages_may_oom should_alloc_retry goto rebalance; If we apply KOSAKI's patch[1] which doesn't depends on kswapd about setting zone->all_unreclaimable, we can solve this problem by killing some task in direct reclaim path. But it doesn't wake up kswapd, still. It could be a problem still if other subsystem needs GFP_ATOMIC request. So kswapd should consider MIGRATE_ISOLATE when it calculate free pages BEFORE going sleep. This patch counts the number of MIGRATE_ISOLATE page block and zone_watermark_ok_safe will consider it if the system has such blocks (fortunately, it's very rare so no problem in POV overhead and kswapd is never hotpath). Copy/modify from Mel's quote " Ideal solution would be "allocating" the pageblock. It would keep the free space accounting as it is but historically, memory hotplug didn't allocate pages because it would be difficult to detect if a pageblock was isolated or if part of some balloon. Allocating just full pageblocks would work around this, However, it would play very badly with CMA. " [1] http://lkml.org/lkml/2012/6/14/74 Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx> Suggested-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Tested-by: Aaditya Kumar <aaditya.kumar.30@xxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mmzone.h | 8 ++++++++ mm/page_alloc.c | 31 +++++++++++++++++++++++++++++++ mm/page_isolation.c | 29 +++++++++++++++++++++++++++-- 3 files changed, 66 insertions(+), 2 deletions(-) diff -puN include/linux/mmzone.h~memory-hotplug-fix-kswapd-looping-forever-problem include/linux/mmzone.h --- a/include/linux/mmzone.h~memory-hotplug-fix-kswapd-looping-forever-problem +++ a/include/linux/mmzone.h @@ -477,6 +477,14 @@ struct zone { * rarely used fields: */ const char *name; +#ifdef CONFIG_MEMORY_ISOLATION + /* + * the number of MIGRATE_ISOLATE *pageblock*. + * We need this for free page counting. Look at zone_watermark_ok_safe. + * It's protected by zone->lock + */ + int nr_pageblock_isolate; +#endif } ____cacheline_internodealigned_in_smp; typedef enum { diff -puN mm/page_alloc.c~memory-hotplug-fix-kswapd-looping-forever-problem mm/page_alloc.c --- a/mm/page_alloc.c~memory-hotplug-fix-kswapd-looping-forever-problem +++ a/mm/page_alloc.c @@ -218,6 +218,11 @@ EXPORT_SYMBOL(nr_online_nodes); int page_group_by_mobility_disabled __read_mostly; +/* + * NOTE: + * Don't use set_pageblock_migratetype(page, MIGRATE_ISOLATE) directly. + * Instead, use {un}set_pageblock_isolate. + */ void set_pageblock_migratetype(struct page *page, int migratetype) { @@ -1618,6 +1623,23 @@ static bool __zone_watermark_ok(struct z return true; } +#ifdef CONFIG_MEMORY_ISOLATION +static inline unsigned long nr_zone_isolate_freepages(struct zone *zone) +{ + unsigned long nr_pages = 0; + + if (unlikely(zone->nr_pageblock_isolate)) { + nr_pages = zone->nr_pageblock_isolate * pageblock_nr_pages; + } + return nr_pages; +} +#else +static inline unsigned long nr_zone_isolate_freepages(struct zone *zone) +{ + return 0; +} +#endif + bool zone_watermark_ok(struct zone *z, int order, unsigned long mark, int classzone_idx, int alloc_flags) { @@ -1633,6 +1655,14 @@ bool zone_watermark_ok_safe(struct zone if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); + /* + * If the zone has MIGRATE_ISOLATE type free page, + * we should consider it. nr_zone_isolate_freepages is never + * accurate so kswapd might not sleep although she can. + * But it's more desirable for memory hotplug rather than + * forever sleep which cause livelock in direct reclaim path. + */ + free_pages -= nr_zone_isolate_freepages(z); return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, free_pages); } @@ -4397,6 +4427,7 @@ static void __paginginit free_area_init_ lruvec_init(&zone->lruvec, zone); zap_zone_vm_stats(zone); zone->flags = 0; + zone->nr_pageblock_isolate = 0; if (!size) continue; diff -puN mm/page_isolation.c~memory-hotplug-fix-kswapd-looping-forever-problem mm/page_isolation.c --- a/mm/page_isolation.c~memory-hotplug-fix-kswapd-looping-forever-problem +++ a/mm/page_isolation.c @@ -8,6 +8,31 @@ #include <linux/memory.h> #include "internal.h" +/* called by holding zone->lock */ +static void set_pageblock_isolate(struct zone *zone, struct page *page) +{ + BUG_ON(page_zone(page) != zone); + + if (get_pageblock_migratetype(page) == MIGRATE_ISOLATE) + return; + + set_pageblock_migratetype(page, MIGRATE_ISOLATE); + zone->nr_pageblock_isolate++; +} + +/* called by holding zone->lock */ +static void restore_pageblock_isolate(struct zone *zone, struct page *page, + int migratetype) +{ + BUG_ON(page_zone(page) != zone); + if (WARN_ON(get_pageblock_migratetype(page) != MIGRATE_ISOLATE)) + return; + + BUG_ON(zone->nr_pageblock_isolate <= 0); + set_pageblock_migratetype(page, migratetype); + zone->nr_pageblock_isolate--; +} + int set_migratetype_isolate(struct page *page) { struct zone *zone; @@ -54,7 +79,7 @@ int set_migratetype_isolate(struct page out: if (!ret) { - set_pageblock_migratetype(page, MIGRATE_ISOLATE); + set_pageblock_isolate(zone, page); move_freepages_block(zone, page, MIGRATE_ISOLATE); } @@ -72,8 +97,8 @@ void unset_migratetype_isolate(struct pa spin_lock_irqsave(&zone->lock, flags); if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) goto out; - set_pageblock_migratetype(page, migratetype); move_freepages_block(zone, page, migratetype); + restore_pageblock_isolate(zone, page, migratetype); out: spin_unlock_irqrestore(&zone->lock, flags); } _ Subject: Subject: memory-hotplug: fix kswapd looping forever problem Patches currently in -mm which might be from minchan@xxxxxxxxxx are origin.patch linux-next.patch swap-allow-swap-readahead-to-be-merged.patch documentation-update-how-page-cluster-affects-swap-i-o.patch mm-compaction-cleanup-on-compaction_deferred.patch memcg-prevent-oom-with-too-many-dirty-pages.patch mm-clear-pages_scanned-only-if-draining-a-pcp-adds-pages-to-the-buddy-allocator-again.patch mm-do-not-use-page_count-without-a-page-pin.patch mm-clean-up-__count_immobile_pages.patch vmscan-remove-obsolete-shrink_control-comment.patch mm-hotplug-correctly-setup-fallback-zonelists-when-creating-new-pgdat.patch mm-hotplug-correctly-add-new-zone-to-all-other-nodes-zone-lists.patch mm-hotplug-free-zone-pageset-when-a-zone-becomes-empty.patch mm-hotplug-mark-memory-hotplug-code-in-page_allocc-as-__meminit.patch mm-factor-out-memory-isolate-functions.patch mm-bug-fix-free-page-check-in-zone_watermark_ok.patch memory-hotplug-fix-kswapd-looping-forever-problem.patch memory-hotplug-fix-kswapd-looping-forever-problem-fix.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html