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mm/workingset.c: avoid unnecessary max_nodes estimation in count_shadow_nodes() 

If list_lru_shrink_count is 0, we always return SHRINK_EMPTY regardless of
the value of max_nodes.  So we can return early if nodes == 0 to save some
cpu cycles of approximating a reasonable limit for the nodes.

Link: https://lkml.kernel.org/r/20210123073825.46709-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2021-02-24 12:08:06 -08:00 committed by Linus Torvalds
parent c2135f7c57
commit 725cac1c7e
1 changed files with 2 additions and 3 deletions
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5
mm/workingset.c
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@ -461,6 +461,8 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
unsigned long pages;
nodes = list_lru_shrink_count(&shadow_nodes, sc);
if (!nodes)
return SHRINK_EMPTY;
/*
* Approximate a reasonable limit for the nodes
@ -503,9 +505,6 @@ static unsigned long count_shadow_nodes(struct shrinker *shrinker,
max_nodes = pages >> (XA_CHUNK_SHIFT - 3);
if (!nodes)
return SHRINK_EMPTY;
if (nodes <= max_nodes)
return 0;
return nodes - max_nodes;