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Commit abaff32a authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf record: Add --append option 



Allow incremental profiling via 'perf record -A' - this will append
to an existing perf.data.

Also reorder perf record options by utility / likelyhood of usage.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent cf25c63c

Documentation/perf_counter/builtin-record.c

+26 −14
Original line number Diff line number Diff line 




/*

 * perf record: Record the profile of a workload (or a CPU, or a PID) into

 * the perf.data output file - for later analysis via perf report.

 */

#include "perf.h"

#include "builtin.h"

#include "util/util.h"
@@ -28,6 +30,7 @@ static int system_wide = 0; 
static pid_t			target_pid			= -1;

static int			inherit				= 1;

static int			force				= 0;

static int			append_file			= 0;



const unsigned int default_count[] = {

	1000000,
@@ -385,22 +388,29 @@ static void open_counters(int cpu, pid_t pid) 
static int __cmd_record(int argc, const char **argv)

{

	int i, counter;

	struct stat st;

	pid_t pid;

	int flags;

	int ret;

	struct stat st;



	page_size = sysconf(_SC_PAGE_SIZE);

	nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);

	assert(nr_cpus <= MAX_NR_CPUS);

	assert(nr_cpus >= 0);



	if (!stat(output_name, &st) && !force) {

		fprintf(stderr, "Error, output file: %s exists, use -f to overwrite.\n",

	if (!stat(output_name, &st) && !force && !append_file) {

		fprintf(stderr, "Error, output file %s exists, use -A to append or -f to overwrite.\n",

				output_name);

		exit(-1);

	}



	output = open(output_name, O_CREAT|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR);

	flags = O_CREAT|O_RDWR;

	if (append_file)

		flags |= O_APPEND;

	else

		flags |= O_TRUNC;



	output = open(output_name, flags, S_IRUSR|S_IWUSR);

	if (output < 0) {

		perror("failed to create output file");

		exit(-1);
@@ -466,22 +476,24 @@ static char events_help_msg[EVENTS_HELP_MAX]; 
static const struct option options[] = {

	OPT_CALLBACK('e', "event", NULL, "event",

		     events_help_msg, parse_events),

	OPT_INTEGER('c', "count", &default_interval,

		    "event period to sample"),

	OPT_INTEGER('m', "mmap-pages", &mmap_pages,

		    "number of mmap data pages"),

	OPT_STRING('o', "output", &output_name, "file",

		    "output file name"),

	OPT_BOOLEAN('i', "inherit", &inherit,

		    "child tasks inherit counters"),

	OPT_INTEGER('p', "pid", &target_pid,

		    "record events on existing pid"),

	OPT_INTEGER('r', "realtime", &realtime_prio,

		    "collect data with this RT SCHED_FIFO priority"),

	OPT_BOOLEAN('a', "all-cpus", &system_wide,

			    "system-wide collection from all CPUs"),

	OPT_BOOLEAN('A', "append", &append_file,

			    "append to the output file to do incremental profiling"),

	OPT_BOOLEAN('f', "force", &force,

			"overwrite existing data file"),

	OPT_INTEGER('c', "count", &default_interval,

		    "event period to sample"),

	OPT_STRING('o', "output", &output_name, "file",

		    "output file name"),

	OPT_BOOLEAN('i', "inherit", &inherit,

		    "child tasks inherit counters"),

	OPT_INTEGER('m', "mmap-pages", &mmap_pages,

		    "number of mmap data pages"),

	OPT_END()

};