Re: [PATCH 1/3] perf tool: precise mode requires exclude_guest
From: Robert Richter
Date: Thu Sep 13 2012 - 05:13:10 EST
On 12.09.12 11:50:57, Arnaldo Carvalho de Melo wrote:
> Em Wed, Sep 12, 2012 at 07:46:55PM +0200, Robert Richter escreveu:
> > On 12.09.12 09:16:28, David Ahern wrote:
> > >
> > > Kernel side AMD currently ignores all exclude_* bits, so there is no impact
> > > to existing IBS code paths. Robert Richter has a patch where IBS code will
> > > return EINVAL if an exclude_* bit is set. When this goes in it means use
> > > of :p on AMD with IBS will first fail with EINVAL (because exclude_guest
> > > will be set). Then the existing fallback code within perf will unset
> > > exclude_guest and try again. The second attempt will succeed if the CPU
> > > supports IBS profiling.
> > >
> > > Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
> > > Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> > > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> > > Cc: Robert Richter <robert.richter@xxxxxxx>
> > > Cc: Gleb Natapov <gleb@xxxxxxxxxx>
> > > Cc: Avi Kivity <avi@xxxxxxxxxx>
> > > Link: https://lkml.org/lkml/2012/7/9/264
> > > ---
> > > tools/perf/util/parse-events.c | 3 +++
> > > 1 file changed, 3 insertions(+)
> > Acked-by: Robert Richter <robert.richter@xxxxxxx>
> > I tested the patch set with AMD IBS and it works fine.
> Ok, I think that in this specific patchset I can add:
> Tested-by: Robert Richter <robert.richter@xxxxxxx>
> Reviewed-by: Robert Richter <robert.richter@xxxxxxx>
> Instead of an Acked-by, may I?
I am fine with this.
> - Arnaldo
Advanced Micro Devices, Inc.
Operating System Research Center
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/