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erofs: return SHRINK_EMPTY if no objects to free

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Comments in file include/linux/shrinker.h says that
`count_objects` of `struct shrinker` should return SHRINK_EMPTY
when there are no objects to free.

> If there are no objects to free, it should return SHRINK_EMPTY,
> while 0 is returned in cases of the number of freeable items cannot
> be determined or shrinker should skip this cache for this time
> (e.g., their number is below shrinkable limit).

Signed-off-by: Chen Linxuan <chenlinxuan@uniontech.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
Link: https://lore.kernel.org/r/149E6E64B5B6B5E8+20250116083303.199817-1-chenlinxuan@uniontech.com
[ Gao Xiang: should have no impact since it's not memcg-aware. ]
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Chen Linxuan
2025-01-16 16:33:02 +08:00
committed by Gao Xiang
parent e180b8c4c2
commit 41fb0fabc4
1 changed files with 1 additions and 1 deletions
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2
fs/erofs/zutil.c
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@@ -243,7 +243,7 @@ void erofs_shrinker_unregister(struct super_block *sb)
static unsigned long erofs_shrink_count(struct shrinker *shrink,
struct shrink_control *sc)
{
return atomic_long_read(&erofs_global_shrink_cnt);
return atomic_long_read(&erofs_global_shrink_cnt) ?: SHRINK_EMPTY;
}
static unsigned long erofs_shrink_scan(struct shrinker *shrink,