linux-kernel - [PATCH V2 1/3] perf: add a dummy software event to keep tracking

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Message-Id: <1377975053-3811-2-git-send-email-adrian.hunter@intel.com>
Date:	Sat, 31 Aug 2013 21:50:51 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH V2 1/3] perf: add a dummy software event to keep tracking

When an event is disabled the "tracking" events
selected by the 'mmap', 'comm' and 'task' bits of
struct perf_event_attr, are also disabled.  However,
the information those events provide is necessary to
resolve symbols for when the main event is re-enabled.

The "tracking" events can be kept enabled by putting
them on another event, but that requires an event
that otherwise does nothing.  A new software event
PERF_COUNT_SW_DUMMY is added for that purpose.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Acked-by: Peter Zijlstra <peterz@...radead.org>
---
 include/uapi/linux/perf_event.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 42cb7b6..108c4bc 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -109,6 +109,7 @@ enum perf_sw_ids {
 	PERF_COUNT_SW_PAGE_FAULTS_MAJ		= 6,
 	PERF_COUNT_SW_ALIGNMENT_FAULTS		= 7,
 	PERF_COUNT_SW_EMULATION_FAULTS		= 8,
+	PERF_COUNT_SW_DUMMY			= 9,
 
 	PERF_COUNT_SW_MAX,			/* non-ABI */
 };
-- 
1.7.11.7

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