linux-kernel - [tip:perf/live] perf report: Introduce special handling for pipe input

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Date:	Wed, 14 Apr 2010 10:04:13 GMT
From:	tip-bot for Tom Zanussi <tzanussi@...il.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tzanussi@...il.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/live] perf report: Introduce special handling for pipe input

Commit-ID:  46656ac7fb3252f8a3db29b18638e0e8067849ba
Gitweb:     http://git.kernel.org/tip/46656ac7fb3252f8a3db29b18638e0e8067849ba
Author:     Tom Zanussi <tzanussi@...il.com>
AuthorDate: Thu, 1 Apr 2010 23:59:17 -0500
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 14 Apr 2010 11:56:06 +0200

perf report: Introduce special handling for pipe input

Adds special treatment for stdin - if the user specifies '-i -'
to perf report, the intent is that the event stream be written
to stdin rather than from a disk file.

The actual handling of the '-' filename is done by the session;
this just adds a signal handler to stop reporting, and turns off
interference by the pager.

Signed-off-by: Tom Zanussi <tzanussi@...il.com>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: fweisbec@...il.com
Cc: rostedt@...dmis.org
Cc: k-keiichi@...jp.nec.com
Cc: acme@...stprotocols.net
LKML-Reference: <1270184365-8281-4-git-send-email-tzanussi@...il.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 tools/perf/builtin-report.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index daee082..00b358f 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -269,6 +269,13 @@ static struct perf_event_ops event_ops = {
 	.read	= process_read_event,
 };
 
+extern volatile int session_done;
+
+static void sig_handler(int sig __attribute__((__unused__)))
+{
+	session_done = 1;
+}
+
 static int __cmd_report(void)
 {
 	int ret = -EINVAL;
@@ -276,6 +283,8 @@ static int __cmd_report(void)
 	struct rb_node *next;
 	const char *help = "For a higher level overview, try: perf report --sort comm,dso";
 
+	signal(SIGINT, sig_handler);
+
 	session = perf_session__new(input_name, O_RDONLY, force);
 	if (session == NULL)
 		return -ENOMEM;
@@ -465,7 +474,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __used)
 {
 	argc = parse_options(argc, argv, options, report_usage, 0);
 
-	setup_browser();
+	if (strcmp(input_name, "-") != 0)
+		setup_browser();
 
 	if (symbol__init() < 0)
 		return -1;
--
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