linux-kernel - Re: [RFC PATCH 2/4] sched: Use traced preempt count operations to toggle PREEMPT

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Message-ID: <20150128154230.GH23038@twins.programming.kicks-ass.net>
Date:	Wed, 28 Jan 2015 16:42:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH 2/4] sched: Use traced preempt count operations to
 toggle PREEMPT_ACTIVE

On Wed, Jan 28, 2015 at 01:24:10AM +0100, Frederic Weisbecker wrote:
> d1f74e20b5b064a130cd0743a256c2d3cfe84010 turned PREEMPT_ACTIVE modifiers
> to use raw untraced preempt count operations. Meanwhile this prevents
> from debugging and tracing preemption disabled if we pull that
> responsibility to schedule() callers (see following patches).
> 
Why do you care anyhow? The trace format has the preempt count in, so
any change is obvious.
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