linux-kernel - Re: perf: regression -- missing /sys/devices/system/cpu/perf

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Message-ID: <alpine.DEB.2.00.1105241610390.24062@cl320.eecs.utk.edu>
Date:	Tue, 24 May 2011 16:12:49 -0400 (EDT)
From:	Vince Weaver <vweaver1@...s.utk.edu>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, paulus@...ba.org, acme@...hat.com
Subject: Re: perf: regression -- missing
 /sys/devices/system/cpu/perf_events

On Tue, 24 May 2011, Ingo Molnar wrote:
> 
> So, what is wrong with the method Peter suggested: the presence of the perf 
> syscall (it not returning -ENOSYS) is bona fide evidence that perf is 
> available.

it's just hard to do that from a shell script.

also, running the perf syscall can be tricky if you have a new kernel but 
an older set of header files that doesn't have the syscall number defined.

Vince
vweaver1@...s.utk.edu
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