linux-kernel - Re: [PATCH 5/7] memcg: get rid of once-per-second cache shrinking for dead memcgs

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Message-ID: <50A5CA16.7070603@jp.fujitsu.com>
Date:	Fri, 16 Nov 2012 14:07:34 +0900
From:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [PATCH 5/7] memcg: get rid of once-per-second cache shrinking
 for dead memcgs

(2012/11/15 22:47), Glauber Costa wrote:
> On 11/15/2012 01:41 PM, Kamezawa Hiroyuki wrote:
>> (2012/11/15 11:54), Glauber Costa wrote:
>>> The idea is to synchronously do it, leaving it up to the shrinking
>>> facilities in vmscan.c and/or others. Not actively retrying shrinking
>>> may leave the caches alive for more time, but it will remove the ugly
>>> wakeups. One would argue that if the caches have free objects but are
>>> not being shrunk, it is because we don't need that memory yet.
>>>
>>> Signed-off-by: Glauber Costa <glommer@...allels.com>
>>> CC: Michal Hocko <mhocko@...e.cz>
>>> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>>> CC: Johannes Weiner <hannes@...xchg.org>
>>> CC: Andrew Morton <akpm@...ux-foundation.org>
>>
>> I agree this patch but can we have a way to see the number of unaccounted
>> zombie cache usage for debugging ?
>>
>> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
>>
> Any particular interface in mind ?
> 

Hmm, it's debug interface and having cgroup file may be bad.....
If it can be seen in bytes or some, /proc/vmstat ?

out_of_track_slabs  xxxxxxx. hm ?

Thanks,
-Kame






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