linux-kernel - Re: [PATCH 3/3] sched: Implement interface for cgroup unified hierarchy

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Date:	Thu, 20 Aug 2015 10:47:26 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Paul Turner <pjt@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>, lizefan@...wei.com,
	cgroups <cgroups@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-team <kernel-team@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 3/3] sched: Implement interface for cgroup unified
 hierarchy

On Thu, 2015-08-20 at 00:52 -0700, Tejun Heo wrote:

> Hmmm... I think this discussion got pretty badly derailed at this
> point.  If I'm not mistaken, you're talking about tens or a few
> hundred millisecs of latency per migration which no longer exists and
> won't ever come back and the discussion originally was about something
> like migrating thread for issuing several IO requests versus bouncing
> that to a dedicated issuer thread in that domain.

Yes, ms latencies ever coming back is the concern, whether that be due
to something akin to the old synchronize_rcu() horror.. or some handoff
of whatever to whomever.

	-Mike

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