linux-kernel - Re: [PATCH] perf, ibs: Check syscall attribute flags

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Date:	Fri, 07 Sep 2012 11:11:56 -0600
From:	David Ahern <dsahern@...il.com>
To:	Robert Richter <robert.richter@....com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf, ibs: Check syscall attribute flags

On 9/7/12 11:07 AM, Robert Richter wrote:
>> Am I reading this right - if exclude_guest is set then perf_ibs_init
>> returns -EINVAL?
>
> Yes, the hardware does not support this. I will look for a solution
> which emulates this is software.

ugh, that's exactly we need for Intel: if precise is set, exclude_guest 
must be set.

In perf I would like to set exclude_guest if precise is set -- what I 
mentioned yesterday for the patch https://lkml.org/lkml/2012/7/20/437. 
With my patch -e cycles:p on AMD will then fail EINVAL.

David


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