From: Tejun Heo <tj@kernel.org>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: akpm@linux-foundation.org, mhocko@kernel.org,
cgroups@vger.kernel.org, linux-mm@kvack.org,
vdavydov@parallels.com, kernel-team@fb.com
Subject: Re: [PATCH v3 2/2] memcg: punt high overage reclaim to return-to-userland path
Date: Tue, 15 Sep 2015 11:53:55 -0400 [thread overview]
Message-ID: <20150915155355.GH2905@mtj.duckdns.org> (raw)
In-Reply-To: <20150915074724.GE2858@cmpxchg.org>
Hello, Johannes.
On Tue, Sep 15, 2015 at 09:47:24AM +0200, Johannes Weiner wrote:
> Why can't we simply fail NOWAIT allocations when the high limit is
> breached? We do the same for the max limit.
Because that can lead to continued systematic failures of NOWAIT
allocations. For that to work, we'll have to add async reclaimaing.
> As I see it, NOWAIT allocations are speculative attempts on available
> memory. We should be able to just fail them and have somebody that is
> allowed to reclaim try again, just like with the max limit.
Yes, but the assumption is that even back-to-back NOWAIT allocations
won't continue to fail indefinitely.
Thanks.
--
tejun
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next prev parent reply other threads:[~2015-09-15 15:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-13 18:59 [PATCH 1/2] memcg: flatten task_struct->memcg_oom Tejun Heo
2015-09-13 19:00 ` [PATCH v3 2/2] memcg: punt high overage reclaim to return-to-userland path Tejun Heo
2015-09-15 7:47 ` Johannes Weiner
2015-09-15 15:53 ` Tejun Heo [this message]
2015-09-15 16:12 ` Johannes Weiner
2015-09-15 16:22 ` Tejun Heo
2015-09-15 16:33 ` Johannes Weiner
2015-09-15 7:37 ` [PATCH 1/2] memcg: flatten task_struct->memcg_oom Johannes Weiner
2015-09-20 14:45 ` Sasha Levin
2015-09-21 20:01 ` Tejun Heo
2015-09-30 18:54 ` Tejun Heo
2015-11-25 14:43 ` Peter Zijlstra
2015-11-25 15:02 ` Peter Zijlstra
2015-11-25 15:31 ` Andrey Ryabinin
2015-11-25 17:34 ` Dmitry Vyukov
2015-11-25 17:44 ` Peter Zijlstra
2015-12-11 16:25 ` Tejun Heo
2015-12-15 19:22 ` Peter Zijlstra
2015-12-30 9:23 ` [PATCH v4.4-rc7] sched: isolate task_struct bitfields according to synchronization domains Tejun Heo
2015-12-30 20:10 ` Linus Torvalds
2015-12-30 20:17 ` Linus Torvalds
2015-12-30 20:41 ` Tejun Heo
2015-12-30 20:43 ` Linus Torvalds
2016-01-01 2:56 ` [PATCH v4.4-rc7] sched: move sched lock synchronized bitfields in task_struct into ->atomic_flags Tejun Heo
2016-01-06 13:44 ` Tejun Heo
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