path: root/tools/perf/builtin-record.c

/*
 * builtin-record.c
 *
 * Builtin record command: Record the profile of a workload
 * (or a CPU, or a PID) into the perf.data output file - for
 * later analysis via perf report.
 */
#define _FILE_OFFSET_BITS 64

#include "builtin.h"

#include "perf.h"

#include "util/build-id.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"

#include "util/header.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/debug.h"
#include "util/session.h"
#include "util/symbol.h"
#include "util/cpumap.h"
#include "util/thread_map.h"

#include <unistd.h>
#include <sched.h>
#include <sys/mman.h>

enum write_mode_t {
	WRITE_FORCE,
	WRITE_APPEND
};

static u64			user_interval			= ULLONG_MAX;
static u64			default_interval		=      0;

static unsigned int		page_size;
static unsigned int		mmap_pages			= UINT_MAX;
static unsigned int		user_freq 			= UINT_MAX;
static int			freq				=   1000;
static int			output;
static int			pipe_output			=      0;
static const char		*output_name			= NULL;
static bool			group				=  false;
static int			realtime_prio			=      0;
static bool			nodelay				=  false;
static bool			raw_samples			=  false;
static bool			sample_id_all_avail		=   true;
static bool			system_wide			=  false;
static pid_t			target_pid			=     -1;
static pid_t			target_tid			=     -1;
static pid_t			child_pid			=     -1;
static bool			no_inherit			=  false;
static enum write_mode_t	write_mode			= WRITE_FORCE;
static bool			call_graph			=  false;
static bool			inherit_stat			=  false;
static bool			no_samples			=  false;
static bool			sample_address			=  false;
static bool			sample_time			=  false;
static bool			no_buildid			=  false;
static bool			no_buildid_cache		=  false;
static struct perf_evlist	*evsel_list;

static long			samples				=      0;
static u64			bytes_written			=      0;

static int			file_new			=      1;
static off_t			post_processing_offset;

static struct perf_session	*session;
static const char		*cpu_list;

static void advance_output(size_t size)
{
	bytes_written += size;
}

static void write_output(void *buf, size_t size)
{
	while (size) {
		int ret = write(output, buf, size);

		if (ret < 0)
			die("failed to write");

		size -= ret;
		buf += ret;

		bytes_written += ret;
	}
}

static int process_synthesized_event(union perf_event *event,
				     struct perf_sample *sample __used,
				     struct perf_session *self __used)
{
	write_output(event, event->header.size);
	return 0;
}

static void mmap_read(struct perf_mmap *md)
{
	unsigned int head = perf_mmap__read_head(md);
	unsigned int old = md->prev;
	unsigned char *data = md->base + page_size;
	unsigned long size;
	void *buf;

	if (old == head)
		return;

	samples++;

	size = head - old;

	if ((old & md->mask) + size != (head & md->mask)) {
		buf = &data[old & md->mask];
		size = md->mask + 1 - (old & md->mask);
		old += size;

		write_output(buf, size);
	}

	buf = &data[old & md->mask];
	size = head - old;
	old += size;

	write_output(buf, size);

	md->prev = old;
	perf_mmap__write_tail(md, old);
}

static volatile int done = 0;
static volatile int signr = -1;

static void sig_handler(int sig)
{
	done = 1;
	signr = sig;
}

static void sig_atexit(void)
{
	if (child_pid > 0)
		kill(child_pid, SIGTERM);

	if (signr == -1 || signr == SIGUSR1)
		return;

	signal(signr, SIG_DFL);
	kill(getpid(), signr);
}

static void config_attr(struct perf_evsel *evsel, struct perf_evlist *evlist)
{
	struct perf_event_attr *attr = &evsel->attr;
	int track = !evsel->idx; /* only the first counter needs these */

	attr->inherit		= !no_inherit;
	attr->read_format	= PERF_FORMAT_TOTAL_TIME_ENABLED |
				  PERF_FORMAT_TOTAL_TIME_RUNNING |
				  PERF_FORMAT_ID;

	attr->sample_type	|= PERF_SAMPLE_IP | PERF_SAMPLE_TID