Commit d450bc50 authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
Browse files

perf daemon: Add daemon command 



Add a daemon skeleton with a minimal base (non) functionality, covering
various setup in start command.

Add an initial perf-daemon.txt with basic info.

This is in response to pople asking for the possibility to be able run
record long running sessions on the background.

The patchset that starts with this adds support to configure and run
record sessions on background via new 'perf daemon' command.

This is useful for being able to use perf as a flight recorder that one
can interact with asking for events to be enabled or disabled, added or
removed, etc.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexei Budankov <abudankov@huawei.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/20210208200908.1019149-2-jolsa@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 8524711d

tools/perf/Build

+1 −0
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ perf-y += builtin-mem.o 
perf-y += builtin-data.o

perf-y += builtin-version.o

perf-y += builtin-c2c.o

perf-y += builtin-daemon.o



perf-$(CONFIG_TRACE) += builtin-trace.o

perf-$(CONFIG_LIBELF) += builtin-probe.o

tools/perf/Documentation/perf-daemon.txt

0 → 100644
+40 −0
Original line number Diff line number Diff line 
perf-daemon(1)

==============





NAME

----

perf-daemon - Run record sessions on background





SYNOPSIS

--------

[verse]

'perf daemon'

'perf daemon' [<options>]

'perf daemon start'  [<options>]





DESCRIPTION

-----------

This command allows to run simple daemon process that starts and

monitors configured record sessions.





OPTIONS

-------

-v::

--verbose::

	Be more verbose.



All generic options are available also under commands.





START COMMAND

-------------

The start command creates the daemon process.





SEE ALSO

--------

linkperf:perf-record[1], linkperf:perf-config[1]

tools/perf/builtin-daemon.c

0 → 100644
+86 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

#include <subcmd/parse-options.h>

#include <linux/limits.h>

#include <string.h>

#include <signal.h>

#include <stdio.h>

#include <unistd.h>

#include "builtin.h"

#include "perf.h"

#include "debug.h"

#include "util.h"



struct daemon {

	char			*base;

	FILE			*out;

	char			 perf[PATH_MAX];

};



static struct daemon __daemon = { };



static const char * const daemon_usage[] = {

	"perf daemon start [<options>]",

	"perf daemon [<options>]",

	NULL

};



static bool done;



static void sig_handler(int sig __maybe_unused)

{

	done = true;

}



static int __cmd_start(struct daemon *daemon, struct option parent_options[],

		       int argc, const char **argv)

{

	struct option start_options[] = {

		OPT_PARENT(parent_options),

		OPT_END()

	};

	int err = 0;



	argc = parse_options(argc, argv, start_options, daemon_usage, 0);

	if (argc)

		usage_with_options(daemon_usage, start_options);



	debug_set_file(daemon->out);

	debug_set_display_time(true);



	pr_info("daemon started (pid %d)\n", getpid());



	signal(SIGINT, sig_handler);

	signal(SIGTERM, sig_handler);



	while (!done && !err) {

		sleep(1);

	}



	pr_info("daemon exited\n");

	fclose(daemon->out);

	return err;

}



int cmd_daemon(int argc, const char **argv)

{

	struct option daemon_options[] = {

		OPT_INCR('v', "verbose", &verbose, "be more verbose"),

		OPT_END()

	};



	perf_exe(__daemon.perf, sizeof(__daemon.perf));

	__daemon.out = stdout;



	argc = parse_options(argc, argv, daemon_options, daemon_usage,

			     PARSE_OPT_STOP_AT_NON_OPTION);



	if (argc) {

		if (!strcmp(argv[0], "start"))

			return __cmd_start(&__daemon, daemon_options, argc, argv);



		pr_err("failed: unknown command '%s'\n", argv[0]);

		return -1;

	}



	return -1;

}

tools/perf/builtin.h

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ int cmd_inject(int argc, const char **argv); 
int cmd_mem(int argc, const char **argv);

int cmd_data(int argc, const char **argv);

int cmd_ftrace(int argc, const char **argv);

int cmd_daemon(int argc, const char **argv);



int find_scripts(char **scripts_array, char **scripts_path_array, int num,

		 int pathlen);

tools/perf/command-list.txt

+1 −0
Original line number Diff line number Diff line
@@ -31,3 +31,4 @@ perf-timechart mainporcelain common 
perf-top			mainporcelain common

perf-trace			mainporcelain audit

perf-version			mainporcelain common

perf-daemon			mainporcelain common