linux-kernel - Re: [tip:sched/core] sched: Ensure that a child can't gain time over it's parent after fork()

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Message-Id: <1252413733.11445.0.camel@marge.simson.net>
Date:	Tue, 08 Sep 2009 14:42:13 +0200
From:	Mike Galbraith <efault@....de>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	tglx@...utronix.de, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:sched/core] sched: Ensure that a child can't gain time
 over it's parent after fork()

On Tue, 2009-09-08 at 13:53 +0200, Jens Axboe wrote:
> On Tue, Sep 08 2009, Ingo Molnar wrote:
> > 
> > * tip-bot for Mike Galbraith <efault@....de> wrote:
> > 
> > > Commit-ID:  b5d9d734a53e0204aab0089079cbde2a1285a38f
> > > Gitweb:     http://git.kernel.org/tip/b5d9d734a53e0204aab0089079cbde2a1285a38f
> > > Author:     Mike Galbraith <efault@....de>
> > > AuthorDate: Tue, 8 Sep 2009 11:12:28 +0200
> > > Committer:  Ingo Molnar <mingo@...e.hu>
> > > CommitDate: Tue, 8 Sep 2009 13:15:34 +0200
> > > 
> > > sched: Ensure that a child can't gain time over it's parent after fork()
> > 
> > > This improves latencies of make -j<n> kernel build workloads.
> > > 
> > > Reported-by: Jens Axboe <jens.axboe@...cle.com>
> > 
> > Jens, mind trying this patch (or latest tip:master) with your make 
> > -j4 workload, does it improve in any way?
> 
> Already booted it, makes no real difference... I'm trying with NO_HZ
> disabled now to see if that changes the picture.

Oh well, BTTODB.  Thanks for trying it out.

	-Mike

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