From: Jiri Olsa <jolsa@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: lkml <linux-kernel@vger.kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Namhyung Kim <namhyung@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Michael Petlan <mpetlan@redhat.com>,
Ian Rogers <irogers@google.com>,
Alexei Budankov <abudankov@huawei.com>
Subject: [PATCH 08/24] perf daemon: Add background support
Date: Mon, 8 Feb 2021 21:08:52 +0100 [thread overview]
Message-ID: <20210208200908.1019149-9-jolsa@kernel.org> (raw)
In-Reply-To: <20210208200908.1019149-1-jolsa@kernel.org>
Adding support to put daemon process in the background.
It's now enabled by default and -f option is added to
keep daemon process on the console for debugging.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
tools/perf/Documentation/perf-daemon.txt | 4 ++
tools/perf/builtin-daemon.c | 62 ++++++++++++++++++++++++
2 files changed, 66 insertions(+)
diff --git a/tools/perf/Documentation/perf-daemon.txt b/tools/perf/Documentation/perf-daemon.txt
index 173b3f9f3a41..af5916d1c3e0 100644
--- a/tools/perf/Documentation/perf-daemon.txt
+++ b/tools/perf/Documentation/perf-daemon.txt
@@ -56,6 +56,10 @@ START COMMAND
-------------
The start command creates the daemon process.
+-f::
+--foreground::
+ Do not put the process in background.
+
CONFIG FILE
-----------
diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
index bdddaa2ea388..2d7f282809b6 100644
--- a/tools/perf/builtin-daemon.c
+++ b/tools/perf/builtin-daemon.c
@@ -675,10 +675,61 @@ static int setup_config(struct daemon *daemon)
return daemon->config_real ? 0 : -1;
}
+static int go_background(struct daemon *daemon)
+{
+ int pid, fd;
+
+ pid = fork();
+ if (pid < 0)
+ return -1;
+
+ if (pid > 0)
+ return 1;
+
+ if (setsid() < 0)
+ return -1;
+
+ umask(0);
+
+ if (chdir(daemon->base)) {
+ perror("failed: chdir");
+ return -1;
+ }
+
+ fd = open("output", O_RDWR|O_CREAT|O_TRUNC, 0644);
+ if (fd < 0) {
+ perror("failed: open");
+ return -1;
+ }
+
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
+ perror("failed: fcntl FD_CLOEXEC");
+ close(fd);
+ return -1;
+ }
+
+ close(0);
+ dup2(fd, 1);
+ dup2(fd, 2);
+ close(fd);
+
+ daemon->out = fdopen(1, "w");
+ if (!daemon->out) {
+ close(1);
+ close(2);
+ return -1;
+ }
+
+ setbuf(daemon->out, NULL);
+ return 0;
+}
+
static int __cmd_start(struct daemon *daemon, struct option parent_options[],
int argc, const char **argv)
{
+ bool foreground = false;
struct option start_options[] = {
+ OPT_BOOLEAN('f', "foreground", &foreground, "stay on console"),
OPT_PARENT(parent_options),
OPT_END()
};
@@ -699,6 +750,17 @@ static int __cmd_start(struct daemon *daemon, struct option parent_options[],
if (setup_server_config(daemon))
return -1;
+ if (!foreground) {
+ err = go_background(daemon);
+ if (err) {
+ /* original process, exit normally */
+ if (err == 1)
+ err = 0;
+ daemon__exit(daemon);
+ return err;
+ }
+ }
+
debug_set_file(daemon->out);
debug_set_display_time(true);
--
2.29.2
next prev parent reply other threads:[~2021-02-08 21:13 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 20:08 [PATCHv4 00/24] perf tools: Add daemon command Jiri Olsa
2021-02-08 20:08 ` [PATCH 01/24] perf daemon: " Jiri Olsa
2021-02-08 20:08 ` [PATCH 02/24] perf daemon: Add config option Jiri Olsa
2021-02-08 20:08 ` [PATCH 03/24] perf daemon: Add base option Jiri Olsa
2021-02-08 20:08 ` [PATCH 04/24] perf daemon: Add server socket support Jiri Olsa
2021-02-08 20:08 ` [PATCH 05/24] perf daemon: Add client " Jiri Olsa
2021-02-11 12:52 ` Arnaldo Carvalho de Melo
2021-02-11 16:35 ` Jiri Olsa
2021-02-08 20:08 ` [PATCH 06/24] perf daemon: Add config file support Jiri Olsa
2021-02-11 6:01 ` Namhyung Kim
2021-02-11 16:45 ` Jiri Olsa
2021-02-11 17:10 ` Arnaldo Carvalho de Melo
2021-02-11 22:52 ` Jiri Olsa
2021-02-08 20:08 ` [PATCH 07/24] perf daemon: Add config file change check Jiri Olsa
2021-02-08 20:08 ` Jiri Olsa [this message]
2021-02-08 20:08 ` [PATCH 09/24] perf daemon: Add signalfd support Jiri Olsa
2021-02-08 20:08 ` [PATCH 10/24] perf daemon: Add list command Jiri Olsa
2021-02-08 20:08 ` [PATCH 11/24] perf daemon: Add signal command Jiri Olsa
2021-02-08 20:08 ` [PATCH 12/24] perf daemon: Add stop command Jiri Olsa
2021-02-08 20:08 ` [PATCH 13/24] perf daemon: Allow only one daemon over base directory Jiri Olsa
2021-02-11 13:20 ` Arnaldo Carvalho de Melo
2021-02-11 16:35 ` Jiri Olsa
2021-02-08 20:08 ` [PATCH 14/24] perf daemon: Set control fifo for session Jiri Olsa
2021-02-08 20:08 ` [PATCH 15/24] perf daemon: Add ping command Jiri Olsa
2021-02-10 12:51 ` Arnaldo Carvalho de Melo
2021-02-10 13:27 ` Jiri Olsa
2021-02-08 20:09 ` [PATCH 16/24] perf daemon: Use control to stop session Jiri Olsa
2021-02-08 20:09 ` [PATCH 17/24] perf daemon: Add up time for daemon/session list Jiri Olsa
2021-02-08 20:09 ` [PATCH 18/24] perf daemon: Add examples to man page Jiri Olsa
2021-02-08 20:09 ` [PATCH 19/24] perf tests: Add daemon list command test Jiri Olsa
2021-02-08 20:09 ` [PATCH 20/24] perf tests: Add daemon reconfig test Jiri Olsa
2021-02-08 20:09 ` [PATCH 21/24] perf tests: Add daemon stop command test Jiri Olsa
2021-02-08 20:09 ` [PATCH 22/24] perf tests: Add daemon signal " Jiri Olsa
2021-02-08 20:09 ` [PATCH 23/24] perf tests: Add daemon ping " Jiri Olsa
2021-02-08 20:09 ` [PATCH 24/24] perf tests: Add daemon lock test Jiri Olsa
[not found] <20210129134855.195810-1-jolsa@redhat.com>
2021-01-30 23:48 ` [PATCHv3 00/24] perf tools: Add daemon command Jiri Olsa
2021-01-30 23:48 ` [PATCH 08/24] perf daemon: Add background support Jiri Olsa
2021-02-03 21:16 ` Arnaldo Carvalho de Melo
2021-02-04 14:52 ` Jiri Olsa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210208200908.1019149-9-jolsa@kernel.org \
--to=jolsa@kernel.org \
--cc=a.p.zijlstra@chello.nl \
--cc=abudankov@huawei.com \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=irogers@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@kernel.org \
--cc=mpetlan@redhat.com \
--cc=namhyung@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).