linux-kernel - Re: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average tracking

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Date:	Mon, 28 Jul 2014 09:49:18 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Yuyang Du <yuyang.du@...el.com>
Cc:	mingo@...hat.com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, pjt@...gle.com, bsegall@...gle.com,
	arjan.van.de.ven@...el.com, len.brown@...el.com,
	rafael.j.wysocki@...el.com, alan.cox@...el.com,
	mark.gross@...el.com, fengguang.wu@...el.com
Subject: Re: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average
 tracking

On Mon, 2014-07-28 at 03:34 +0800, Yuyang Du wrote: 
> Thanks a lot, Mike.
> 
> Ben asked for this test, but actually I don't know how to get pipe-test, still
> not even after google it.

You could write it trivially, it's just pipe ping-pong.  I can send you
a copy of the one I use if you like.  Ingo wrote it way back in the dark
ages, I use it to watch out for fastpath lard accumulation.
> So the result is flat compared to before or a pass?

Yeah, my little box said it was a deep cgroup price noop, but a modest
win for root.  I love minus signs, they work great, though sometimes in
highly mysterious ways :)

-Mike

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