linux-kernel - Re: [patch] x86, perf_counter, bts: optimize BTS overflow handling

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Message-ID: <20090915113408.GD1328@ucw.cz>
Date:	Tue, 15 Sep 2009 13:34:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	Markus Metzger <markus.t.metzger@...el.com>
Cc:	mingo@...e.hu, tglx@...utronix.de, hpa@...or.com,
	markus.t.metzger@...il.com, linux-kernel@...r.kernel.org,
	a.p.zijlstra@...llo.nl
Subject: Re: [patch] x86, perf_counter, bts: optimize BTS overflow handling

On Tue 2009-09-08 08:31:10, Markus Metzger wrote:
> Draining the BTS buffer on a buffer overflow interrupt takes too long
> resulting in a kernel lockup when tracing the kernel.

Wait. If 'takes too long' leads to 'lockup'...solution is not making
it faster. Solution should be making kernel robust -- maybe disable
tracing when it can't keep up or something...? or maybe disabling
interrupt until you handle the previous one...?
								Pavel 



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