linux-kernel - Re: [PATCH v2 1/2] sched: schedule_tail() should disable preemption

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Message-ID: <20141009151730.GW10832@worktop.programming.kicks-ass.net>
Date:	Thu, 9 Oct 2014 17:17:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Kirill Tkhai <tkhai@...dex.ru>, Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] sched: schedule_tail() should disable preemption

On Thu, Oct 09, 2014 at 04:57:26PM +0200, Oleg Nesterov wrote:

> but first we need to remove ->saved_preempt_count.

Why do you want to kill that? Your earlier proposal would penalize every
!x86 arch by adding extra code to the scheduler core while they already
automagically preserve their thread_info::preempt_count.

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