linux-kernel - Re: [PATCH v3 15/16] memcg/sl[au]b: shrink dead caches

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Date:	Fri, 21 Sep 2012 13:48:30 +0900
From:	JoonSoo Kim <js1304@...il.com>
To:	Glauber Costa <glommer@...allels.com>
Cc:	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
	kamezawa.hiroyu@...fujitsu.com, devel@...nvz.org,
	Tejun Heo <tj@...nel.org>, linux-mm@...ck.org,
	Suleiman Souhlal <suleiman@...gle.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mel Gorman <mgorman@...e.de>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v3 15/16] memcg/sl[au]b: shrink dead caches

Hi Glauber.

2012/9/18 Glauber Costa <glommer@...allels.com>:
> diff --git a/mm/slub.c b/mm/slub.c
> index 0b68d15..9d79216 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -2602,6 +2602,7 @@ redo:
>         } else
>                 __slab_free(s, page, x, addr);
>
> +       kmem_cache_verify_dead(s);
>  }

As far as u know, I am not a expert and don't know anything about memcg.
IMHO, this implementation may hurt system performance in some case.

In case of memcg is destoried, remained kmem_cache is marked "dead".
After it is marked,
every free operation to this "dead" kmem_cache call
kmem_cache_verify_dead() and finally call kmem_cache_shrink().
kmem_cache_shrink() do invoking kmalloc and flush_all() and taking a
lock for online node and invoking kfree.
Especially, flush_all() may hurt performance largely, because it call
has_cpu_slab() against all the cpus.

And I know some other case it can hurt system performance.
But, I don't mention it, because above case is sufficient to worry.

And, I found one case that destroying memcg's kmem_cache don't works properly.
If we destroy memcg after all object is freed, current implementation
doesn't destroy kmem_cache.
kmem_cache_destroy_work_func() check "cachep->memcg_params.nr_pages == 0",
but in this case, it return false, because kmem_cache may have
cpu_slab, and cpu_partials_slabs.
As we already free all objects, kmem_cache_verify_dead() is not invoked forever.
I think that we need another kmem_cache_shrink() in
kmem_cache_destroy_work_func().

I don't convince that I am right, so think carefully my humble opinion.

Thanks.
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