linux-kernel - [PATCH 07/11] perf: Handle injection iotcl for tracepoints from perf record

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Date:	Wed,  3 Feb 2010 10:14:31 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 07/11] perf: Handle injection iotcl for tracepoints from perf record

Call the injection iotcl request for tracepoint events, in case
some of them support it.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Hitoshi Mitake <mitake@....info.waseda.ac.jp>
Cc: Li Zefan <lizf@...fujitsu.com>
Cc: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Jens Axboe <jens.axboe@...cle.com>
---
 tools/perf/builtin-record.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index eea5691..da42519 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -386,6 +386,15 @@ try_again:
 	}
 
 	ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE);
+
+	/*
+	 * If a tracepoint has some events he wants us to catchup
+	 * let's inject them. We may have such injectable event
+	 * in several cpus, we want only one injection, so pick the
+	 * first cpu
+	 */
+	if (attr->type == PERF_TYPE_TRACEPOINT && !nr_cpu)
+		ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_INJECT);
 }
 
 static void open_counters(int cpu, pid_t pid)
-- 
1.6.2.3

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