linux-kernel - Re: [patch] make wake-affine a sysctl variable

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Date:	Fri, 05 Dec 2008 09:51:57 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ken Chen <kenchen@...gle.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [patch] make wake-affine a sysctl variable

On Fri, 2008-12-05 at 00:44 -0800, Ken Chen wrote:
> On Thu, Dec 4, 2008 at 11:49 PM, Peter Zijlstra wrote:
> > This patch looks like utter rubbish, sorry.
> 
> Yeah, I think turning off wake-affine completely is a lot cleaner and
> is a preferred solution.  I proposed sysctl variable earlier so that
> it can give people a knob to adjust and is more flexible.

Hehe, right, I guess I deserved that.

What I meant was, sysctl_sched_features is a horrid user interface. If
you want to expose it as a sysctl - which I still don't think we want -
create a new one that goes on/off, like sysctl_sched_wake_affine.

Anyway, is this thing you're seeing the same as pgbench, if not, care to
cook a benchmark? I really think the 1:N waker issue is solvable (not
saying its easy though).

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