linux-kernel - Re: [PATCH] sched/clock: prevent tracing recursion in sched_clock

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Date:	Thu, 6 Mar 2014 11:51:31 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Fernando Luis Vázquez Cao 
	<fernando_b1@....ntt.co.jp>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	StevenRostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched/clock: prevent tracing recursion in
 sched_clock_cpu()

On Thu, Mar 06, 2014 at 02:25:28PM +0900, Fernando Luis Vázquez Cao wrote:
> From: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>
> 
> Prevent tracing of preempt_disable/enable() in sched_clock_cpu().
> When CONFIG_DEBUG_PREEMPT is enabled, preempt_disable/enable() are
> traced and this causes trace_clock() users (and probably others) to
> go into an infinite recursion. Systems with a stable sched_clock()
> are not affected.
> 
> This problem is similar to that fixed by upstream commit 95ef1e52922
> ("KVM guest: prevent tracing recursion with kvmclock").
> 
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>

Thanks!
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