linux-kernel - Re: [patch] Re: PostgreSQL pgbench performance regression in 2.6.23+

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Message-Id: <1211877312.5760.30.camel@marge.simson.net>
Date:	Tue, 27 May 2008 10:35:12 +0200
From:	Mike Galbraith <efault@....de>
To:	Greg Smith <gsmith@...gsmith.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] Re: PostgreSQL pgbench performance regression in
	2.6.23+


On Tue, 2008-05-27 at 10:20 +0200, Mike Galbraith wrote:

> Hm, pbench's extreme dislike of preemption, and the starvation testcase
> I sent earlier having an absolute requirement of preemption kinda argues
> that some knobs and dials should be per task or task group (or, or... or
> scheduler should be all knowing all seeing;) 

(to somewhat solidify the random thought i'm sharing...)

Perhaps a SCHED_PREEMPT class so such things can co-exist:

SCHED_BATCH == I never preempt.
SCHED_NORMAL == I preempt sometimes.
SCHED_PREEMPT == I always preempt my waker.

(end of random synaptic firing;)

	-Mike

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