From: Vlastimil Babka <vbabka@suse.cz>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>, linux-mm@kvack.org
Cc: Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Marco Elver <elver@google.com>,
Matthew WilCox <willy@infradead.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/5] mm/slub: limit number of node partial slabs only in cache creation
Date: Fri, 4 Mar 2022 19:33:10 +0100 [thread overview]
Message-ID: <e0e983ae-fce7-f814-131e-ac5386550bc3@suse.cz> (raw)
In-Reply-To: <20220304063427.372145-5-42.hyeyoo@gmail.com>
On 3/4/22 07:34, Hyeonggon Yoo wrote:
> 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 <vbabka@suse.cz>
> ---
> mm/slub.c | 14 +++-----------
> 1 file changed, 3 insertions(+), 11 deletions(-)
>
> diff --git a/mm/slub.c b/mm/slub.c
> index 6f0ebadd8f30..f9ae983a3dc6 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -3981,15 +3981,6 @@ 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
> @@ -4196,7 +4187,8 @@ 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);
>
> @@ -5361,7 +5353,7 @@ 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);
next prev parent reply other threads:[~2022-03-04 18:33 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-04 6:34 [PATCH v2 0/5] slab cleanups Hyeonggon Yoo
2022-03-04 6:34 ` [PATCH v2 1/5] mm/slab: kmalloc: pass requests larger than order-1 page to page allocator Hyeonggon Yoo
2022-03-04 12:45 ` Vlastimil Babka
2022-03-05 5:10 ` Hyeonggon Yoo
2022-03-04 6:34 ` [PATCH v2 2/5] mm/sl[au]b: unify __ksize() Hyeonggon Yoo
2022-03-04 18:25 ` Vlastimil Babka
2022-03-05 4:02 ` Hyeonggon Yoo
2022-03-04 6:34 ` [PATCH v2 3/5] mm/sl[auo]b: move definition of __ksize() to mm/slab.h Hyeonggon Yoo
2022-03-04 18:29 ` Vlastimil Babka
2022-03-05 4:03 ` Hyeonggon Yoo
2022-03-04 6:34 ` [PATCH v2 4/5] mm/slub: limit number of node partial slabs only in cache creation Hyeonggon Yoo
2022-03-04 18:33 ` Vlastimil Babka [this message]
2022-03-04 6:34 ` [PATCH v2 5/5] mm/slub: refactor deactivate_slab() Hyeonggon Yoo
2022-03-04 19:01 ` Vlastimil Babka
2022-03-05 4:21 ` Hyeonggon Yoo
2022-03-04 11:50 ` [PATCH v2 0/5] slab cleanups Marco Elver
2022-03-04 12:02 ` Hyeonggon Yoo
2022-03-04 13:11 ` Marco Elver
2022-03-04 16:42 ` Vlastimil Babka
2022-03-04 16:45 ` Marco Elver
2022-03-05 4:00 ` Hyeonggon Yoo
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