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

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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: Jens 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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jens Axboe 2009-08-12 11:18:01 +02:00 committed by Ingo Molnar
parent 1340e6bbaf
commit 0a5ac84650
1 changed files with 14 additions and 3 deletions
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17
tools/perf/builtin-record.c
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@ -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(i, target_pid);
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,