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

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Date:	Tue, 15 Sep 2009 13:19:36 +0100
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"hpa@...or.com" <hpa@...or.com>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [patch, resend] x86, perf_counter, bts: optimize BTS overflow
 handling

>-----Original Message-----
>From: Peter Zijlstra [mailto:a.p.zijlstra@...llo.nl]
>Sent: Tuesday, September 15, 2009 1:40 PM


>You could also look at throttling the BTS interrupt when you notice
>you're doing them back-to-back..

There are always ~2k kernel branches between two interrupts.

I would need to detect whether the rest of the kernel has enough
time left. Any idea how I could do this?

thanks and regards,
markus.

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