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| author | Barry Song <v-songbaohua@oppo.com> | 2024-06-30 01:41:55 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-07-10 21:14:55 +0200 |
| commit | e5a119c4a6835a53f93fcfba6c177daef58467e3 (patch) | |
| tree | 6980fab937aa8762dc94601b68b308405b83a9ac /mm | |
| parent | mm/page_alloc: remove prefetchw() on freeing page to buddy system (diff) | |
| download | linux-e5a119c4a6835a53f93fcfba6c177daef58467e3.tar.xz linux-e5a119c4a6835a53f93fcfba6c177daef58467e3.zip | |
mm/vmscan: drop checking if _deferred_list is empty before using TTU_SYNC
The optimization of list_empty(&folio->_deferred_list) aimed to prevent
increasing the PTL duration when a large folio is partially unmapped, for
example, from subpage 0 to subpage (nr - 2).
But Ryan's commit 5ed890ce5147 ("mm: vmscan: avoid split during
shrink_folio_list()") actually splits this kind of large folios. This
makes the "optimization" useless.
Additionally, the list_empty() technically required a data_race()
annotation.
Link: https://lkml.kernel.org/r/20240629234155.53524-1-21cnbao@gmail.com
Signed-off-by: Barry Song <v-songbaohua@oppo.com>
Reviewed-by: Ryan Roberts <ryan.roberts@arm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/vmscan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 3d4c681c6d40..0761f91b407f 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1291,7 +1291,7 @@ retry: * try_to_unmap acquire PTL from the first PTE, * eliminating the influence of temporary PTE values. */ - if (folio_test_large(folio) && list_empty(&folio->_deferred_list)) + if (folio_test_large(folio)) flags |= TTU_SYNC; try_to_unmap(folio, flags); |