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| author | Yu Zhao <yuzhao@google.com> | 2020-10-13 16:52:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-13 18:38:30 -0700 |
| commit | 6f4dd8de4835563de9bae797ce1d7a13465a7a7d (patch) | |
| tree | 586753f6737ec1725ea722e7b0d29e3482764ebf /mm/memremap.c | |
| parent | cc2828b21c764f901128ca2e7b9f056d0e72104f (diff) | |
| download | linux-6f4dd8de4835563de9bae797ce1d7a13465a7a7d.tar.bz2 | |
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/memremap.c')
| -rw-r--r-- | mm/memremap.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/memremap.c b/mm/memremap.c index 532ec3d36ab4..7dc7aec971de 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -494,8 +494,6 @@ void free_devmap_managed_page(struct page *page) return; } - /* Clear Active bit in case of parallel mark_page_accessed */ - __ClearPageActive(page); __ClearPageWaiters(page); mem_cgroup_uncharge(page); |