linux-kernel - Re: [V2][PATCH 5/5] oprofile, x86: Reimplement nmi timer mode using perf event

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Message-ID: <1320929525.13800.13.camel@twins>
Date:	Thu, 10 Nov 2011 13:52:05 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Robert Richter <robert.richter@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>
Subject: Re: [V2][PATCH 5/5] oprofile, x86: Reimplement nmi timer mode using
 perf event

On Sun, 2011-10-23 at 13:27 +0200, Ingo Molnar wrote:
> * Robert Richter <robert.richter@....com> wrote:
> 
> > The legacy x86 nmi watchdog code was removed with the implementation
> > of the perf based nmi watchdog. This broke Oprofile's nmi timer
> > mode. To run nmi timer mode we relied on a continuous ticking nmi
> > source which the nmi watchdog provided. The nmi tick was no longer
> > available and current watchdog can not be used anymore since it runs
> > with very long periods in the range of seconds. This patch
> > reimplements the nmi timer mode using a perf counter nmi source.
> > 

> Looks clean to me. Peter, any objections?

No.
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