linux-kernel - [tip:perf/core] perf evlist: Add perf_evlist__to

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Date:	Mon, 16 Dec 2013 07:27:33 -0800
From:	tip-bot for Adrian Hunter <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, eranian@...gle.com, mingo@...hat.com,
	mingo@...nel.org, a.p.zijlstra@...llo.nl, efault@....de,
	jolsa@...hat.com, fweisbec@...il.com, ak@...ux.intel.com,
	dsahern@...il.com, tglx@...utronix.de, hpa@...or.com,
	paulus@...ba.org, linux-kernel@...r.kernel.org, namhyung@...il.com,
	adrian.hunter@...el.com
Subject: [tip:perf/core] perf evlist: Add perf_evlist__to_front()

Commit-ID:  a025e4f0d8a92b38539d39b495b530015296b4d9
Gitweb:     http://git.kernel.org/tip/a025e4f0d8a92b38539d39b495b530015296b4d9
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Wed, 11 Dec 2013 14:36:35 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 13 Dec 2013 10:30:21 -0300

perf evlist: Add perf_evlist__to_front()

Add a function to move a selected event to the
front of the list.

This is needed because it is not possible
to use the PERF_EVENT_IOC_SET_OUTPUT IOCTL
from an Instruction Tracing event to a
non-Instruction Tracing event.  Thus the
Instruction Tracing event must come first.

Cc: Andi Kleen <ak@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/r/1386765443-26966-24-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 17 +++++++++++++++++
 tools/perf/util/evlist.h |  3 +++
 2 files changed, 20 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 2eb7378..0b31cee 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1212,3 +1212,20 @@ int perf_evlist__strerror_open(struct perf_evlist *evlist __maybe_unused,
 
 	return 0;
 }
+
+void perf_evlist__to_front(struct perf_evlist *evlist,
+			   struct perf_evsel *move_evsel)
+{
+	struct perf_evsel *evsel, *n;
+	LIST_HEAD(move);
+
+	if (move_evsel == perf_evlist__first(evlist))
+		return;
+
+	list_for_each_entry_safe(evsel, n, &evlist->entries, node) {
+		if (evsel->leader == move_evsel->leader)
+			list_move_tail(&evsel->node, &move);
+	}
+
+	list_splice(&move, &evlist->entries);
+}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 8a04aae..9f64ede 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -194,5 +194,8 @@ static inline void perf_mmap__write_tail(struct perf_mmap *md,
 }
 
 bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str);
+void perf_evlist__to_front(struct perf_evlist *evlist,
+			   struct perf_evsel *move_evsel);
+
 
 #endif /* __PERF_EVLIST_H */
--
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