On 7/23/12 12:13 PM, Arnaldo Carvalho de Melo wrote:
Em Fri, Jul 20, 2012 at 05:25:53PM -0600, David Ahern escreveu:
PEBS cannot be used with guest mode. If user adds :p modifier set
exclude_guest as well.
Is this something Intel specific? Or can someone think of an arch where
this limitation wouldn't exist?
Good point. So far precise_ip is used by arch/x86 only. I don't have an
AMD based server so I don't know if there is a conflict between
virtualization and IBS. Added Robert for advice.
David
Signed-off-by: David Ahern <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Gleb Natapov <[email protected]>
Link: https://lkml.org/lkml/2012/7/9/264
---
tools/perf/util/parse-events.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 1aa721d..f34629b 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -653,6 +653,9 @@ int parse_events_modifier(struct list_head *list, char *str)
eH = 0;
} else if (*str == 'p') {
precise++;
+ /* use of precise requires exclude_guest */
+ if (!exclude_GH)
+ eG = 1;
} else
break;
--
1.7.10.1
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