linux-kernel - Re: [PATCH] perf_counter: fix perf

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Message-ID: <20090324122520.GA17442@elte.hu>
Date:	Tue, 24 Mar 2009 13:25:20 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <efault@....de>, Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] perf_counter: fix perf_poll()


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, 2009-03-24 at 13:18 +0100, Peter Zijlstra wrote:
> > The below does seem to fix things (along with the previous kerneltop.c
> > patch),.. however now kerneltop is going splat like:
> > 
> > # ./kerneltop -e 1:2 -c 10
> > KernelTop refresh period: 2 seconds
> > ret: 1
> >  left: 0000000080200000
> >    ip: 000000008038d4ad
> > right: 00000000ffffffff
> > kerneltop: kerneltop.c:985: record_ip: Assertion `left <= ip && ip <= right' failed.
> > Aborted
> > 
> > Which isn't making much sense..
> 
> Seems to be an artefact of running a 32bit kerneltop on a 64bit 
> kernel.. freshyl compiled 64bit kerneltop works just fine.

Looks like you discovered a real bug by accident :)

	Ingo
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