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

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Message-ID: <20120907170700.GK8285@erda.amd.com>
Date:	Fri, 7 Sep 2012 19:07:00 +0200
From:	Robert Richter <robert.richter@....com>
To:	David Ahern <dsahern@...il.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 07.09.12 10:50:35, David Ahern wrote:
> On 9/7/12 10:41 AM, Robert Richter wrote:
> > +	struct perf_event_attr notsupp = {
> > +		.exclude_user	= 1,
> > +		.exclude_kernel	= 1,
> > +		.exclude_hv	= 1,
> > +		.exclude_idle	= 1,
> > +		.exclude_host	= 1,
> > +		.exclude_guest	= 1,
> > +	};
> >
> >   	perf_ibs = get_ibs_pmu(event->attr.type);
> >   	if (perf_ibs) {
> > @@ -229,6 +237,9 @@ static int perf_ibs_init(struct perf_event *event)
> >   	if (event->pmu != &perf_ibs->pmu)
> >   		return -ENOENT;
> >
> > +	if (perf_flags(&event->attr) & perf_flags(&notsupp))
> > +		return -EINVAL;
> > +
> 
> 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.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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