linux-kernel - Re: [PATCH] mm/slub: fix accumulate per cpu partial cache objects

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Date:	Sun, 29 Dec 2013 13:49:48 +0200
From:	Pekka Enberg <penberg@...nel.org>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: fix accumulate per cpu partial cache objects

On Sat, Dec 28, 2013 at 3:50 AM, Li Zefan <lizefan@...wei.com> wrote:
> On 2013/12/27 17:46, Wanpeng Li wrote:
>> SLUB per cpu partial cache is a list of slab caches to accelerate objects
>> allocation. However, current codes just accumulate the objects number of
>> the first slab cache of per cpu partial cache instead of traverse the whole
>> list.
>>
>> Signed-off-by: Wanpeng Li <liwanp@...ux.vnet.ibm.com>
>> ---
>>  mm/slub.c |   32 +++++++++++++++++++++++---------
>>  1 files changed, 23 insertions(+), 9 deletions(-)
>>
>> diff --git a/mm/slub.c b/mm/slub.c
>> index 545a170..799bfdc 100644
>> --- a/mm/slub.c
>> +++ b/mm/slub.c
>> @@ -4280,7 +4280,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
>>                       struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab,
>>                                                              cpu);
>>                       int node;
>> -                     struct page *page;
>> +                     struct page *page, *p;
>>
>>                       page = ACCESS_ONCE(c->page);
>>                       if (!page)
>> @@ -4298,8 +4298,9 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
>>                       nodes[node] += x;
>>
>>                       page = ACCESS_ONCE(c->partial);
>> -                     if (page) {
>> -                             x = page->pobjects;
>> +                     while ((p = page)) {
>> +                             page = p->next;
>> +                             x = p->pobjects;
>>                               total += x;
>>                               nodes[node] += x;
>>                       }
>
> Can we apply this patch first? It was sent month ago, but Pekka was not responsive.

Applied. Wanpeng, care to resend your patch?
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