From 5182f3c9180397b16d15981b385ecfad9249e527 Mon Sep 17 00:00:00 2001 From: Hyeonggon Yoo <42.hyeyoo@gmail.com> Date: Mon, 7 Mar 2022 07:40:55 +0000 Subject: mm/slub: limit number of node partial slabs only in cache creation SLUB sets number of minimum partial slabs for node (min_partial) using set_min_partial(). SLUB holds at least min_partial slabs even if they're empty to avoid excessive use of page allocator. set_min_partial() limits value of min_partial limits value of min_partial MIN_PARTIAL and MAX_PARTIAL. As set_min_partial() can be called by min_partial_store() too, Only limit value of min_partial in kmem_cache_open() so that it can be changed to value that a user wants. [ rientjes@google.com: Fold set_min_partial() into its callers ] Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Reviewed-by: Vlastimil Babka Reviewed-by: Roman Gushchin Signed-off-by: Vlastimil Babka Link: https://lore.kernel.org/r/20220307074057.902222-2-42.hyeyoo@gmail.com --- mm/slub.c | 14 +++----------- 1 file changed, 3 insertions(+), 11 deletions(-) (limited to 'mm/slub.c') diff --git a/mm/slub.c b/mm/slub.c index 261474092e43..1ce09b0347ad 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4000,15 +4000,6 @@ static int init_kmem_cache_nodes(struct kmem_cache *s) return 1; } -static void set_min_partial(struct kmem_cache *s, unsigned long min) -{ - if (min < MIN_PARTIAL) - min = MIN_PARTIAL; - else if (min > MAX_PARTIAL) - min = MAX_PARTIAL; - s->min_partial = min; -} - static void set_cpu_partial(struct kmem_cache *s) { #ifdef CONFIG_SLUB_CPU_PARTIAL @@ -4215,7 +4206,8 @@ static int kmem_cache_open(struct kmem_cache *s, slab_flags_t flags) * The larger the object size is, the more slabs we want on the partial * list to avoid pounding the page allocator excessively. */ - set_min_partial(s, ilog2(s->size) / 2); + s->min_partial = min_t(unsigned long, MAX_PARTIAL, ilog2(s->size) / 2); + s->min_partial = max_t(unsigned long, MIN_PARTIAL, s->min_partial); set_cpu_partial(s); @@ -5396,7 +5388,7 @@ static ssize_t min_partial_store(struct kmem_cache *s, const char *buf, if (err) return err; - set_min_partial(s, min); + s->min_partial = min; return length; } SLAB_ATTR(min_partial); -- cgit v1.2.3