Re: [PATCH v2 04/11] kmem accounting basic infrastructure

[Ying Han]

On Wed, Aug 15, 2012 at 8:34 AM, Christoph Lameter <cl@xxxxxxxxx> wrote:
> On Wed, 15 Aug 2012, Glauber Costa wrote:
>
>> On 08/15/2012 06:47 PM, Christoph Lameter wrote:
>> > On Wed, 15 Aug 2012, Michal Hocko wrote:
>> >
>> >>> That is not what the kernel does, in general. We assume that if he wants
>> >>> that memory and we can serve it, we should. Also, not all kernel memory
>> >>> is unreclaimable. We can shrink the slabs, for instance. Ying Han
>> >>> claims she has patches for that already...
>> >>
>> >> Are those patches somewhere around?
>> >
>> > You can already shrink the reclaimable slabs (dentries / inodes) via
>> > calls to the subsystem specific shrinkers. Did Ying Han do anything to
>> > go beyond that?
>> >
>> That is not enough for us.
>> We would like to make sure that the objects being discarded belong to
>> the memcg which is under pressure. We don't need to be perfect here, and
>> an occasional slip is totally fine. But if in general, shrinking from
>> memcg A will mostly wipe out objects from memcg B, we harmed the system
>> in return for nothing good.
>
> How can you figure out which objects belong to which memcg? The ownerships
> of dentries and inodes is a dubious concept already.

I figured it out based on the kernel slab accounting.
obj->page->kmem_cache->memcg

--Ying
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/