linux-kernel - Re: [PATCH -mm 0/8] memcg: reparent kmem on css offline

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Date:	Mon, 7 Jul 2014 21:14:15 +0400
From:	Vladimir Davydov <vdavydov@...allels.com>
To:	Johannes Weiner <hannes@...xchg.org>
CC:	<akpm@...ux-foundation.org>, <mhocko@...e.cz>, <cl@...ux.com>,
	<glommer@...il.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mm 0/8] memcg: reparent kmem on css offline

07.07.2014 18:25, Johannes Weiner:
> In addition, Tejun made offlined css iterable and split css_tryget()
> and css_tryget_online(), which would allow memcg to pin the css until
> the last charge is gone while continuing to iterate and reclaim it on
> hierarchical pressure, even after it was offlined.

One more question.

With reparenting enabled, the number of cgroups (lruvecs) that must be
iterated on global reclaim is bound by the number of live containers,
while w/o reparenting it's practically unbound, isn't it? Won't it be
the source of latency spikes?

Thanks.
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