linux-kernel - Re: [PATCH 1/1] kthread: disable preemption during complete()

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Message-ID: <1343330992.26034.92.camel@twins>
Date:	Thu, 26 Jul 2012 21:29:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Tejun Heo <tj@...nel.org>,
	Peter Boonstoppel <pboonstoppel@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
	Andy Walls <awalls@...metrocast.net>,
	Diwakar Tundlam <dtundlam@...dia.com>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/1] kthread: disable preemption during complete()

On Thu, 2012-07-26 at 17:54 +0200, Oleg Nesterov wrote:
> Yes, but this "avoid the preemption after wakeup" can actually help
> kthread_bind()->wait_task_inactive() ?

Yeah.

> This reminds me, Peter had a patch which teaches wait_task_inactive()
> to use sched_in/sched_out notifiers to avoid the polling... 

I did, but from what I could remember you shot holes in it and I didn't
find a way to plug them and not make it a bigger mess than it is now :/
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