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authorYu Zhao <yuzhao@google.com>2020-10-14 02:52:11 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-14 04:38:30 +0300
commit6f4dd8de4835563de9bae797ce1d7a13465a7a7d (patch)
tree586753f6737ec1725ea722e7b0d29e3482764ebf /mm/swap.c
parentcc2828b21c764f901128ca2e7b9f056d0e72104f (diff)
downloadlinux-6f4dd8de4835563de9bae797ce1d7a13465a7a7d.tar.xz
mm: remove superfluous __ClearPageActive()
To activate a page, mark_page_accessed() always holds a reference on it. It either gets a new reference when adding a page to lru_pvecs.activate_page or reuses an existing one it previously got when it added a page to lru_pvecs.lru_add. So it doesn't call SetPageActive() on a page that doesn't have any reference left. Therefore, the race is impossible these days (I didn't brother to dig into its history). For other paths, namely reclaim and migration, a reference count is always held while calling SetPageActive() on a page. SetPageSlabPfmemalloc() also uses SetPageActive(), but it's irrelevant to LRU pages. Signed-off-by: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Yang Shi <shy828301@gmail.com> Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com> Cc: David Hildenbrand <david@redhat.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Hugh Dickins <hughd@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@suse.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Qian Cai <cai@lca.pw> Link: http://lkml.kernel.org/r/20200818184704.3625199-2-yuzhao@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/swap.c')
-rw-r--r--mm/swap.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/swap.c b/mm/swap.c
index 82ddefda4904..8c936404f254 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -943,8 +943,6 @@ void release_pages(struct page **pages, int nr)
del_page_from_lru_list(page, lruvec, page_off_lru(page));
}
- /* Clear Active bit in case of parallel mark_page_accessed */
- __ClearPageActive(page);
__ClearPageWaiters(page);
list_add(&page->lru, &pages_to_free);