From: Michal Hocko <mhocko@suse.cz>
To: Balbir Singh <bsingharora@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
linux-mm <linux-mm@kvack.org>,
"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Ying Han <yinghan@google.com>, Hugh Dickins <hughd@google.com>,
Glauber Costa <glommer@parallels.com>,
Michel Lespinasse <walken@google.com>,
Greg Thelen <gthelen@google.com>, Tejun Heo <tj@kernel.org>
Subject: Re: [patch v4] Soft limit rework
Date: Tue, 4 Jun 2013 20:08:59 +0200 [thread overview]
Message-ID: <20130604180859.GB9321@dhcp22.suse.cz> (raw)
In-Reply-To: <CAKTCnz=MP5iadPJkngJqGMnXSwe9n-xGDEdzuT5Aqoyx0KAYwA@mail.gmail.com>
On Tue 04-06-13 23:27:05, Balbir Singh wrote:
> > OK, let me summarize. The primary intention is to get rid of the current
> > soft reclaim infrastructure which basically bypasses the standard
> > reclaim and tight it directly into shrink_zone code. This also means
> > that the soft reclaim doesn't reclaim at priority 0 and that it is
> > active also for the targeted (aka limit) reclaim.
> >
> > Does this help?
> >
>
> Yes. What are the limitations of no-priority 0 reclaim?
I am not sure I understand the question. What do you mean by
limitations?
The priority-0 scan was always a crude hack. With a lot of pages in on
the LRU it might cause huge big stalls during direct reclaim. There are
workloads which benefited from such an aggressive reclaim - e.g.
streaming IO but that doesn't justify this kind of reclaim.
--
Michal Hocko
SUSE Labs
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next prev parent reply other threads:[~2013-06-04 18:09 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-03 10:18 Michal Hocko
2013-06-03 10:18 ` [patch -v4 1/8] memcg: integrate soft reclaim tighter with zone shrinking code Michal Hocko
2013-06-03 10:18 ` [patch -v4 2/8] memcg: Get rid of soft-limit tree infrastructure Michal Hocko
2013-06-03 10:18 ` [patch -v4 3/8] vmscan, memcg: Do softlimit reclaim also for targeted reclaim Michal Hocko
2013-06-03 10:18 ` [patch -v4 4/8] memcg: enhance memcg iterator to support predicates Michal Hocko
2013-06-04 1:07 ` Tejun Heo
2013-06-04 13:45 ` Michal Hocko
2013-06-04 19:36 ` Tejun Heo
2013-06-04 20:48 ` Michal Hocko
2013-06-04 20:54 ` Tejun Heo
2013-06-05 7:37 ` Michal Hocko
2013-06-05 8:05 ` Tejun Heo
2013-06-05 8:52 ` Michal Hocko
2013-06-05 8:58 ` Tejun Heo
2013-06-05 9:07 ` Michal Hocko
2013-06-05 9:09 ` Tejun Heo
2013-06-07 0:48 ` Tejun Heo
2013-06-07 8:25 ` Michal Hocko
2013-06-10 7:48 ` Michal Hocko
2013-06-03 10:18 ` [patch -v4 5/8] memcg: track children in soft limit excess to improve soft limit Michal Hocko
2013-06-03 10:18 ` [patch -v4 6/8] memcg, vmscan: Do not attempt soft limit reclaim if it would not scan anything Michal Hocko
2013-06-03 10:18 ` [patch -v4 7/8] memcg: Track all children over limit in the root Michal Hocko
2013-06-03 10:18 ` [patch -v4 8/8] memcg, vmscan: do not fall into reclaim-all pass too quickly Michal Hocko
2013-06-04 16:27 ` [patch v4] Soft limit rework Balbir Singh
2013-06-04 16:38 ` Michal Hocko
2013-06-04 17:57 ` Balbir Singh
2013-06-04 18:08 ` Michal Hocko [this message]
2013-06-11 15:43 ` Michal Hocko
2013-06-17 14:01 ` Michal Hocko
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