From: "KAMEZAWA Hiroyuki" <kamezawa.hiroyu@jp.fujitsu.com>
To: balbir@linux.vnet.ibm.com
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, lizf@cn.fujitsu.com,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: Re: [RFC][PATCH 5/5] Memory controller soft limit reclaim on contention (v8)
Date: Fri, 10 Jul 2009 23:15:20 +0900 (JST) [thread overview]
Message-ID: <fda5a0e71781c85d850573fd9166c895.squirrel@webmail-b.css.fujitsu.com> (raw)
In-Reply-To: <20090710105620.GI20129@balbir.in.ibm.com>
Balbir Singh wrote：
> * Balbir Singh <balbir@linux.vnet.ibm.com> [2009-07-10 13:19:06]:
>>
>> Yes, worth experimenting with, I'll redo with the special code
>> removed.
>
>
> OK, so I experimented with it, I found the following behaviour
>
> 1. We try to reclaim, priority is high, scanned pages are low and
> hence memory cgroup zone reclaim returns 0 (no pages could be
> reclaimed).
> 2. Now regular reclaim from balance_pgdat() is called, it is able
> to shrink from global LRU and hence some other mem cgroup, thus
> breaking soft limit semantics.
>
IMO, "breaking soft limit" cannot be an excuse for delaying kswapd too much.
Thanks,
-Kame
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next prev parent reply other threads:[~2009-07-10 13:50 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-09 17:14 [RFC][PATCH 0/5] Memory controller soft limit patches (v8) Balbir Singh
2009-07-09 17:14 ` [RFC][PATCH 1/5] Memory controller soft limit documentation (v8) Balbir Singh
2009-07-10 5:32 ` KAMEZAWA Hiroyuki
2009-07-10 6:48 ` Balbir Singh
2009-07-09 17:14 ` [RFC][PATCH 2/5] Memory controller soft limit interface (v8) Balbir Singh
2009-07-09 17:15 ` [RFC][PATCH 3/5] Memory controller soft limit organize cgroups (v8) Balbir Singh
2009-07-10 5:21 ` KAMEZAWA Hiroyuki
2009-07-10 6:47 ` Balbir Singh
2009-07-10 7:16 ` KAMEZAWA Hiroyuki
2009-07-10 8:05 ` Balbir Singh
2009-07-10 8:14 ` KAMEZAWA Hiroyuki
2009-07-10 8:20 ` Balbir Singh
2009-07-09 17:15 ` [RFC][PATCH 4/5] Memory controller soft limit refactor reclaim flags (v8) Balbir Singh
2009-07-09 17:15 ` [RFC][PATCH 5/5] Memory controller soft limit reclaim on contention (v8) Balbir Singh
2009-07-10 5:30 ` KAMEZAWA Hiroyuki
2009-07-10 6:53 ` Balbir Singh
2009-07-10 7:30 ` KAMEZAWA Hiroyuki
2009-07-10 7:49 ` Balbir Singh
2009-07-10 10:56 ` Balbir Singh
2009-07-10 14:15 ` KAMEZAWA Hiroyuki [this message]
2009-07-10 14:22 ` Balbir Singh
2009-07-10 4:53 ` [RFC][PATCH 0/5] Memory controller soft limit patches (v8) KAMEZAWA Hiroyuki
2009-07-10 5:53 ` Balbir Singh
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