linux-kernel - Re: s2r badness

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Date:	Mon, 20 Jul 2009 17:00:38 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Thomas Gleixner <tglx@...utronix.de>
cc:	Peter Zijlstra <peterz@...radead.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Len Brown <lenb@...nel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: s2r badness



>  
> Just to make the list more complete. If tracing is enabled across
> suspend/resume you'll hit that one as well:
> 
> WARNING: at /home/tglx/work/kernel/git/linux-2.6/kernel/trace/ring_buffer.c:1392 rb_reserve_next_event+0x133/0x27c()
> 
> Negative timestamp delta which is probably due to sched_clock not yet
> adjusted to the TSC which got reset.

Perhaps we need to prevent tracing during a "blackout period" of suspend 
to ram?

-- Steve

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