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

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Message-Id: <1211458176.5693.6.camel@marge.simson.net>
Date:	Thu, 22 May 2008 14:09:36 +0200
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Greg Smith <gsmith@...gsmith.com>,
	lkml <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: PostgreSQL pgbench performance regression in 2.6.23+


On Thu, 2008-05-22 at 13:44 +0200, Peter Zijlstra wrote:

> Humm,.. how to fix this.. we'd need to somehow detect the 1:n nature of
> its operation - I'm sure there are other scenarios that could benefit
> from this.

Maybe simple (minded): cache waker's last non-interrupt context wakee,
if the wakee != cached, ignore SYNC_WAKEUP unless sync was requested at
call time?

	-Mike

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