Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755013Ab0DNKEW (ORCPT ); Wed, 14 Apr 2010 06:04:22 -0400 Received: from hera.kernel.org ([140.211.167.34]:32923 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754993Ab0DNKES (ORCPT ); Wed, 14 Apr 2010 06:04:18 -0400 Date: Wed, 14 Apr 2010 10:03:56 GMT From: tip-bot for Tom Zanussi Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@redhat.com, tzanussi@gmail.com, tglx@linutronix.de, mingo@elte.hu Reply-To: mingo@redhat.com, hpa@zytor.com, linux-kernel@vger.kernel.org, tzanussi@gmail.com, tglx@linutronix.de, mingo@elte.hu In-Reply-To: <1270184365-8281-3-git-send-email-tzanussi@gmail.com> References: <1270184365-8281-3-git-send-email-tzanussi@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:perf/live] perf record: Introduce special handling for pipe output Message-ID: Git-Commit-ID: 529870e37473a9fc609078f03cc5b4148cf06a87 X-Mailer: tip-git-log-daemon MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.2.3 (hera.kernel.org [127.0.0.1]); Wed, 14 Apr 2010 10:03:57 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3172 Lines: 92 Commit-ID: 529870e37473a9fc609078f03cc5b4148cf06a87 Gitweb: http://git.kernel.org/tip/529870e37473a9fc609078f03cc5b4148cf06a87 Author: Tom Zanussi AuthorDate: Thu, 1 Apr 2010 23:59:16 -0500 Committer: Ingo Molnar CommitDate: Wed, 14 Apr 2010 11:56:06 +0200 perf record: Introduce special handling for pipe output Adds special treatment for stdout - if the user specifies '-o -' to perf record, the intent is that the event stream be written to stdout rather than to a disk file. Also, redirect stdout of forked child to stderr - in pipe mode, stdout of the forked child interferes with the stdout perf stream, so redirect it to stderr where it can still be seen but won't be mixed in with the perf output. Signed-off-by: Tom Zanussi Acked-by: Thomas Gleixner Cc: fweisbec@gmail.com Cc: rostedt@goodmis.org Cc: k-keiichi@bx.jp.nec.com Cc: acme@ghostprotocols.net LKML-Reference: <1270184365-8281-3-git-send-email-tzanussi@gmail.com> Signed-off-by: Ingo Molnar --- tools/perf/builtin-record.c | 18 +++++++++++++++--- 1 files changed, 15 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index d060fc5..d4464f7 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -35,6 +35,7 @@ static unsigned int page_size; static unsigned int mmap_pages = 128; static int freq = 1000; static int output; +static int pipe_output = 0; static const char *output_name = "perf.data"; static int group = 0; static unsigned int realtime_prio = 0; @@ -449,7 +450,9 @@ static int __cmd_record(int argc, const char **argv) exit(-1); } - if (!stat(output_name, &st) && st.st_size) { + if (!strcmp(output_name, "-")) + pipe_output = 1; + else if (!stat(output_name, &st) && st.st_size) { if (!force) { if (!append_file) { pr_err("Error, output file %s exists, use -A " @@ -474,7 +477,10 @@ static int __cmd_record(int argc, const char **argv) else flags |= O_TRUNC; - output = open(output_name, flags, S_IRUSR|S_IWUSR); + if (pipe_output) + output = STDOUT_FILENO; + else + output = open(output_name, flags, S_IRUSR | S_IWUSR); if (output < 0) { perror("failed to create output file"); exit(-1); @@ -513,6 +519,8 @@ static int __cmd_record(int argc, const char **argv) } if (!child_pid) { + if (pipe_output) + dup2(2, 1); close(child_ready_pipe[0]); close(go_pipe[1]); fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC); @@ -564,7 +572,11 @@ static int __cmd_record(int argc, const char **argv) open_counters(cpumap[i]); } - if (file_new) { + if (pipe_output) { + err = perf_header__write_pipe(output); + if (err < 0) + return err; + } else if (file_new) { err = perf_header__write(&session->header, output, false); if (err < 0) return err; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/