The patch titled vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 has been added to the -mm tree. Its filename is vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1.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 *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 From: Mel Gorman <mel@xxxxxxxxx> When checking if kswapd is sleeping prematurely, all populated zones are checked instead of the zones the instance of kswapd is responsible for. The counters for kswapd going to sleep prematurely are also named poorly. This patch makes kswapd only check its own zones and renames the relevant counters. This is a fix to the patch vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep.patch and is based on top of mmotm-2009-11-13-19-59. It would be preferable if Kosaki Motohiro signed off on it as he had comments on the patch but the discussion petered out without a solid conclusion. Signed-off-by: Mel Gorman <mel@xxxxxxxxx> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Cc: Mel Gorman <mel@xxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/vmstat.h | 2 +- mm/vmscan.c | 20 +++++++++++++------- mm/vmstat.c | 4 ++-- 3 files changed, 16 insertions(+), 10 deletions(-) diff -puN include/linux/vmstat.h~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 include/linux/vmstat.h --- a/include/linux/vmstat.h~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 +++ a/include/linux/vmstat.h @@ -40,7 +40,7 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS PGSCAN_ZONE_RECLAIM_FAILED, #endif PGINODESTEAL, SLABS_SCANNED, KSWAPD_STEAL, KSWAPD_INODESTEAL, - KSWAPD_PREMATURE_FAST, KSWAPD_PREMATURE_SLOW, + KSWAPD_LOW_WMARK_HIT_QUICKLY, KSWAPD_HIGH_WMARK_HIT_QUICKLY, KSWAPD_SKIP_CONGESTION_WAIT, PAGEOUTRUN, ALLOCSTALL, PGROTATED, #ifdef CONFIG_HUGETLB_PAGE diff -puN mm/vmscan.c~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 mm/vmscan.c --- a/mm/vmscan.c~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 +++ a/mm/vmscan.c @@ -1909,19 +1909,25 @@ unsigned long try_to_free_mem_cgroup_pag #endif /* is kswapd sleeping prematurely? */ -static int sleeping_prematurely(int order, long remaining) +static int sleeping_prematurely(pg_data_t *pgdat, int order, long remaining) { - struct zone *zone; + int i; /* If a direct reclaimer woke kswapd within HZ/10, it's premature */ if (remaining) return 1; /* If after HZ/10, a zone is below the high mark, it's premature */ - for_each_populated_zone(zone) + for (i = 0; i < pgdat->nr_zones; i++) { + struct zone *zone = pgdat->node_zones + i; + + if (!populated_zone(zone)) + continue; + if (!zone_watermark_ok(zone, order, high_wmark_pages(zone), 0, 0)) return 1; + } return 0; } @@ -2225,7 +2231,7 @@ static int kswapd(void *p) long remaining = 0; /* Try to sleep for a short interval */ - if (!sleeping_prematurely(order, remaining)) { + if (!sleeping_prematurely(pgdat, order, remaining)) { remaining = schedule_timeout(HZ/10); finish_wait(&pgdat->kswapd_wait, &wait); prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE); @@ -2236,13 +2242,13 @@ static int kswapd(void *p) * premature sleep. If not, then go fully * to sleep until explicitly woken up */ - if (!sleeping_prematurely(order, remaining)) + if (!sleeping_prematurely(pgdat, order, remaining)) schedule(); else { if (remaining) - count_vm_event(KSWAPD_PREMATURE_FAST); + count_vm_event(KSWAPD_LOW_WMARK_HIT_QUICKLY); else - count_vm_event(KSWAPD_PREMATURE_SLOW); + count_vm_event(KSWAPD_HIGH_WMARK_HIT_QUICKLY); } } diff -puN mm/vmstat.c~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 mm/vmstat.c --- a/mm/vmstat.c~vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1 +++ a/mm/vmstat.c @@ -683,8 +683,8 @@ static const char * const vmstat_text[] "slabs_scanned", "kswapd_steal", "kswapd_inodesteal", - "kswapd_slept_prematurely_fast", - "kswapd_slept_prematurely_slow", + "kswapd_low_wmark_hit_quickly", + "kswapd_high_wmark_hit_quickly", "kswapd_skip_congestion_wait", "pageoutrun", "allocstall", _ Patches currently in -mm which might be from mel@xxxxxxxxx are linux-next.patch mm-add-notifier-in-pageblock-isolation-for-balloon-drivers.patch powerpc-make-the-cmm-memory-hotplug-aware.patch powerpc-make-the-cmm-memory-hotplug-aware-update.patch mm-warn-once-when-a-page-is-freed-with-pg_mlocked-set.patch nodemask-make-nodemask_alloc-more-general.patch hugetlb-rework-hstate_next_node_-functions.patch hugetlb-add-nodemask-arg-to-huge-page-alloc-free-and-surplus-adjust-functions.patch hugetlb-add-nodemask-arg-to-huge-page-alloc-free-and-surplus-adjust-functions-fix.patch hugetlb-factor-init_nodemask_of_node.patch hugetlb-derive-huge-pages-nodes-allowed-from-task-mempolicy.patch hugetlb-add-generic-definition-of-numa_no_node.patch hugetlb-add-per-node-hstate-attributes.patch hugetlb-update-hugetlb-documentation-for-numa-controls.patch hugetlb-use-only-nodes-with-memory-for-huge-pages.patch mm-clear-node-in-n_high_memory-and-stop-kswapd-when-all-memory-is-offlined.patch hugetlb-handle-memory-hot-plug-events.patch hugetlb-offload-per-node-attribute-registrations.patch mm-add-gfp-flags-for-nodemask_alloc-slab-allocations.patch page-allocator-wait-on-both-sync-and-async-congestion-after-direct-reclaim.patch vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep.patch vmscan-stop-kswapd-waiting-on-congestion-when-the-min-watermark-is-not-being-met-v2.patch vmscan-have-kswapd-sleep-for-a-short-interval-and-double-check-it-should-be-asleep-fix-1.patch vmscan-separate-scswap_cluster_max-and-scnr_max_reclaim.patch vmscan-kill-hibernation-specific-reclaim-logic-and-unify-it.patch vmscan-zone_reclaim-dont-use-insane-swap_cluster_max.patch vmscan-kill-scswap_cluster_max.patch vmscan-make-consistent-of-reclaim-bale-out-between-do_try_to_free_page-and-shrink_zone.patch hugetlb-prevent-deadlock-in-__unmap_hugepage_range-when-alloc_huge_page-fails.patch add-debugging-aid-for-memory-initialisation-problems.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