| Message ID | 20210123073825.46709-1-linmiaohe@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm/workingset.c: avoid unnecessary max_nodes estimation in count_shadow_nodes() | expand |
On 1/23/21 8:38 AM, Miaohe Lin wrote: > 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. > > Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> > --- > mm/workingset.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/mm/workingset.c b/mm/workingset.c > index 10e96de945b3..7db8f3dad13c 100644 > --- a/mm/workingset.c > +++ b/mm/workingset.c > @@ -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; >
diff --git a/mm/workingset.c b/mm/workingset.c index 10e96de945b3..7db8f3dad13c 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -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;
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. Signed-off-by: Miaohe Lin <linmiaohe@huawei.com> --- mm/workingset.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)