Commit 0a5ac846 authored by Jens Axboe's avatar Jens Axboe Committed by Ingo Molnar
Browse files

perf record: Add missing -C option support for specifying profile cpu 



perf top supports a -C for setting the profile CPU, but perf
record does not. This adds the same option for perf record,
allowing the user to specify a specific target profile CPU.

Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20090812091801.GC12579@kernel.dk>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 1340e6bb

tools/perf/builtin-record.c

+14 −3
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ static const char *output_name = "perf.data"; 
static int			group				= 0;

static unsigned int		realtime_prio			= 0;

static int			system_wide			= 0;

static int			profile_cpu			= -1;

static pid_t			target_pid			= -1;

static int			inherit				= 1;

static int			force				= 0;
@@ -431,6 +432,8 @@ try_again: 


		if (err == EPERM)

			die("Permission error - are you root?\n");

		else if (err ==  ENODEV && profile_cpu != -1)

			die("No such device - did you specify an out-of-range profile CPU?\n");



		/*

		 * If it's cycles then fall back to hrtimer
@@ -564,9 +567,15 @@ static int __cmd_record(int argc, const char **argv) 
		if (pid == -1)

			pid = getpid();



		open_counters(-1, pid);

	} else for (i = 0; i < nr_cpus; i++)

		open_counters(profile_cpu, pid);

	} else {

		if (profile_cpu != -1) {

			open_counters(profile_cpu, target_pid);

		} else {

			for (i = 0; i < nr_cpus; i++)

				open_counters(i, target_pid);

		}

	}



	if (file_new)

		perf_header__write(header, output);
@@ -645,6 +654,8 @@ static const struct option options[] = { 
			    "system-wide collection from all CPUs"),

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

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

	OPT_INTEGER('C', "profile_cpu", &profile_cpu,

			    "CPU to profile on"),

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

			"overwrite existing data file"),

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

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