linux-kernel - [tip:perf/core] perf record: Prepare picking perf_event_mmap

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Date:	Wed, 29 Jun 2016 02:44:17 -0700
From:	tip-bot for Wang Nan <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, namhyung@...nel.org, nilayvaish@...il.com,
	wangnan0@...wei.com, lizefan@...wei.com, acme@...hat.com,
	tglx@...utronix.de, jolsa@...nel.org, hpa@...or.com,
	linux-kernel@...r.kernel.org, mhiramat@...nel.org,
	hekuang@...wei.com
Subject: [tip:perf/core] perf record: Prepare picking perf_event_mmap_page
 from multiple evlists

Commit-ID:  ee667f947c926eda1b8d6eccd0894bfbed75b6e3
Gitweb:     http://git.kernel.org/tip/ee667f947c926eda1b8d6eccd0894bfbed75b6e3
Author:     Wang Nan <wangnan0@...wei.com>
AuthorDate: Mon, 27 Jun 2016 10:24:05 +0000
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 28 Jun 2016 10:54:54 -0300

perf record: Prepare picking perf_event_mmap_page from multiple evlists

Following commits introduce new evlists to record. This patch adjusts
record__pick_pc() and introduces perf_evlist__pick_pc() to read control
page from one specific evlist. record__pick_pc() will be improved to
search control page from multiple evlists.

Signed-off-by: Wang Nan <wangnan0@...wei.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Nilay Vaish <nilayvaish@...il.com>
Cc: Zefan Li <lizefan@...wei.com>
Cc: pi3orama@....com
Link: http://lkml.kernel.org/r/1467023052-146749-4-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-record.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 18e9abc..b2b3b60 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -686,10 +686,21 @@ perf_event__synth_time_conv(const struct perf_event_mmap_page *pc __maybe_unused
 	return 0;
 }
 
+static const struct perf_event_mmap_page *
+perf_evlist__pick_pc(struct perf_evlist *evlist)
+{
+	if (evlist && evlist->mmap && evlist->mmap[0].base)
+		return evlist->mmap[0].base;
+	return NULL;
+}
+
 static const struct perf_event_mmap_page *record__pick_pc(struct record *rec)
 {
-	if (rec->evlist && rec->evlist->mmap && rec->evlist->mmap[0].base)
-		return rec->evlist->mmap[0].base;
+	const struct perf_event_mmap_page *pc;
+
+	pc = perf_evlist__pick_pc(rec->evlist);
+	if (pc)
+		return pc;
 	return NULL;
 }