Re: [PATCH] slub: Fix calculation of cpu slabs

From: Pekka Enberg
Date: Sun Dec 29 2013 - 06:46:01 EST

On Sat, Oct 5, 2013 at 10:48 AM, Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Sep 10, 2013 at 11:43:37AM +0800, Li Zefan wrote:
>> /sys/kernel/slab/:t-0000048 # cat cpu_slabs
>> 231 N0=16 N1=215
>> /sys/kernel/slab/:t-0000048 # cat slabs
>> 145 N0=36 N1=109
>>See, the number of slabs is smaller than that of cpu slabs.
>>The bug was introduced by commit 49e2258586b423684f03c278149ab46d8f8b6700
>>("slub: per cpu cache for partial pages").
>>We should use page->pages instead of page->pobjects when calculating
>>the number of cpu partial slabs. This also fixes the mapping of slabs
>>and nodes.
>>As there's no variable storing the number of total/active objects in
>>cpu partial slabs, and we don't have user interfaces requiring those
>>statistics, I just add WARN_ON for those cases.
>>Cc: <stable@xxxxxxxxxxxxxxx> # 3.2+
>>Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
> Reviewed-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>

Applied and sorry for the slow response!
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at