linux-kernel - Re: [BUG] perf: perf sched warning possibly due to clock granularity on AMD

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Message-ID: <1328601068.2482.46.camel@laptop>
Date:	Tue, 07 Feb 2012 08:51:08 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Venki Pallipadi <venki@...gle.com>
Cc:	Borislav Petkov <bp@...64.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org, acme@...hat.com, mingo@...e.hu,
	robert.richter@....com, eric.dumazet@...il.com,
	Andreas Herrmann <andreas.herrmann3@....com>
Subject: Re: [BUG] perf: perf sched warning possibly due to clock
 granularity on AMD

On Mon, 2012-02-06 at 13:19 -0800, Venki Pallipadi wrote:
> 
> Yes. If these two flags are set, TSC should be consistent and sched_clock_stable
> could be set and it will be reset if there is a call to mark_tsc_unstable(). 

Only trouble is that sched_clock_cpu() et al. will jump when you flip
sched_clock_stable to 0 after you started using it.. its something we
might want to fix.

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