[PATCH v3 3/4] limit nr_dentries per superblock

Pavel Emelyanov xemul at parallels.com
Mon Aug 15 05:12:55 PDT 2011


On 08/15/2011 03:55 PM, Pekka Enberg wrote:
> On Mon, Aug 15, 2011 at 2:32 PM, Pavel Emelyanov <xemul at parallels.com> wrote:
>>> Couldn't you simply do per-container "struct kmem_accounted_cache" in struct superblock?
>>
>> If by this you mean "account for all the kmem associated with particular superblock" then
>> this is OK for us, but this can't be done in a simple
>>
>>        if (used + size > limit)
>>                return -ENOMEM
>>        else {
>>                used += size;
>>                return 0;
>>        }
>>
>> manner, since once we hit the limit we should shrink the unused dentries. And most of the
>> patches are about this.
> 
> So you want to shrink dentries that were allocated in the container
> that hit the dcache limit? How does this patch set deal with that? Or
> are you referring to some other patches?

Yes, this patchset does only the API part. The full idea is implemented (with poor API though) here:
http://lwn.net/Articles/441164/

>                          Pekka
> .
> 



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