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

From: Peter Zijlstra
Date: Thu Oct 09 2014 - 11:17:41 EST

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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