The patch titled mm: zone_reclaim: make isolate_lru_page() filter-aware has been added to the -mm tree. Its filename is mm-zone_reclaim-make-isolate_lru_page-filter-aware.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: mm: zone_reclaim: make isolate_lru_page() filter-aware From: Minchan Kim <minchan.kim@xxxxxxxxx> In __zone_reclaim case, we don't want to shrink mapped page. Nonetheless, we have isolated mapped page and re-add it into LRU's head. It's unnecessary CPU overhead and makes LRU churning. Of course, when we isolate the page, the page might be mapped but when we try to migrate the page, the page would be not mapped. So it could be migrated. But race is rare and although it happens, it's no big deal. Signed-off-by: Minchan Kim <minchan.kim@xxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> Reviewed-by: Michal Hocko <mhocko@xxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mmzone.h | 3 +++ mm/vmscan.c | 20 ++++++++++++++++++-- 2 files changed, 21 insertions(+), 2 deletions(-) diff -puN include/linux/mmzone.h~mm-zone_reclaim-make-isolate_lru_page-filter-aware include/linux/mmzone.h --- a/include/linux/mmzone.h~mm-zone_reclaim-make-isolate_lru_page-filter-aware +++ a/include/linux/mmzone.h @@ -170,6 +170,9 @@ static inline int is_unevictable_lru(enu #define ISOLATE_ACTIVE ((__force fmode_t)0x2) /* Isolate clean file */ #define ISOLATE_CLEAN ((__force fmode_t)0x4) +/* Isolate unmapped file */ +#define ISOLATE_UNMAPPED ((__force fmode_t)0x8) + /* LRU Isolation modes. */ typedef unsigned __bitwise__ isolate_mode_t; diff -puN mm/vmscan.c~mm-zone_reclaim-make-isolate_lru_page-filter-aware mm/vmscan.c --- a/mm/vmscan.c~mm-zone_reclaim-make-isolate_lru_page-filter-aware +++ a/mm/vmscan.c @@ -1049,6 +1049,9 @@ int __isolate_lru_page(struct page *page if ((mode & ISOLATE_CLEAN) && (PageDirty(page) || PageWriteback(page))) return ret; + if ((mode & ISOLATE_UNMAPPED) && page_mapped(page)) + return ret; + if (likely(get_page_unless_zero(page))) { /* * Be careful not to clear PageLRU until after we're @@ -1478,6 +1481,12 @@ shrink_inactive_list(unsigned long nr_to reclaim_mode |= ISOLATE_ACTIVE; lru_add_drain(); + + if (!sc->may_unmap) + reclaim_mode |= ISOLATE_UNMAPPED; + if (!sc->may_writepage) + reclaim_mode |= ISOLATE_CLEAN; + spin_lock_irq(&zone->lru_lock); if (scanning_global_lru(sc)) { @@ -1598,19 +1607,26 @@ static void shrink_active_list(unsigned struct page *page; struct zone_reclaim_stat *reclaim_stat = get_reclaim_stat(zone, sc); unsigned long nr_rotated = 0; + isolate_mode_t reclaim_mode = ISOLATE_ACTIVE; lru_add_drain(); + + if (!sc->may_unmap) + reclaim_mode |= ISOLATE_UNMAPPED; + if (!sc->may_writepage) + reclaim_mode |= ISOLATE_CLEAN; + spin_lock_irq(&zone->lru_lock); if (scanning_global_lru(sc)) { nr_taken = isolate_pages_global(nr_pages, &l_hold, &pgscanned, sc->order, - ISOLATE_ACTIVE, zone, + reclaim_mode, zone, 1, file); zone->pages_scanned += pgscanned; } else { nr_taken = mem_cgroup_isolate_pages(nr_pages, &l_hold, &pgscanned, sc->order, - ISOLATE_ACTIVE, zone, + reclaim_mode, zone, sc->mem_cgroup, 1, file); /* * mem_cgroup_isolate_pages() keeps track of _ Patches currently in -mm which might be from minchan.kim@xxxxxxxxx are origin.patch mm-compaction-trivial-clean-up-in-acct_isolated.patch mm-change-isolate-mode-from-define-to-bitwise-type.patch mm-compaction-make-isolate_lru_page-filter-aware.patch mm-zone_reclaim-make-isolate_lru_page-filter-aware.patch mm-migration-clean-up-unmap_and_move.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