linux-kernel - Re: sched: tweak select_idle_sibling to look for idle threads

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Message-ID: <20160504154510.GH3448@twins.programming.kicks-ass.net>
Date:	Wed, 4 May 2016 17:45:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Mason <clm@...com>, Mike Galbraith <mgalbraith@...e.de>,
	Ingo Molnar <mingo@...nel.org>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	linux-kernel@...r.kernel.org
Subject: Re: sched: tweak select_idle_sibling to look for idle threads

On Tue, May 03, 2016 at 11:11:53AM -0400, Chris Mason wrote:
> # pick a single core, in my case cpus 0,20 are the same core
> # cpu_hog is any program that spins
> #
> taskset -c 20 cpu_hog &
> 
> # schbench -p 4 means message passing mode with 4 byte messages (like
> # pipe test), no sleeps, just bouncing as fast as it can.
> #
> # make the scheduler choose between the sibling of the hog and cpu 1
> #
> taskset -c 0,1 schbench -p 4 -m 1 -t 1

Will that schbench thingy print something? Mine doesn't seem to output
anything, not actually exit, although it stops consuming CPU cycles at
some point.