linux-kernel - Re: [PATCH -mm 8/8] slab: reap dead memcg caches aggressively

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Message-ID: <CAAmzW4MiUmmqXFeiwVNPDmtOSf6U+9J_U4_ZAF4Qv9w=T4AMiA@mail.gmail.com>
Date:	Mon, 2 Jun 2014 23:01:55 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [PATCH -mm 8/8] slab: reap dead memcg caches aggressively

2014-06-02 21:10 GMT+09:00 Vladimir Davydov <vdavydov@...allels.com>:
> On Mon, Jun 02, 2014 at 01:41:55PM +0900, Joonsoo Kim wrote:
>> According to my code reading, slabs_to_free() doesn't return number of
>> free slabs. This bug is introduced by 0fa8103b. I think that it is
>> better to fix it before applyting this patch. Otherwise, use n->free_objects
>> instead of slabs_tofree() to achieve your purpose correctly.
>
> Hmm, I don't think slab_tofree() computes the number of free slabs
> wrong. If we have N free objects, there may be
> DIV_ROUND_UP(N,objs_per_slab) empty slabs at max, and that's exactly
> what slab_tofree() does, no?

Oops... Sorry for wrong comment.
You are right. Please ignore my comment. :)

BTW, we don't need DIV_ROUND_UP. I think that just N / objs_per_slab is
sufficient to get number of empty slabs at max. Am I missing too?

Thanks.
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