Messages in this thread Patch in this message | | | Date | Wed, 12 Aug 2009 11:18:01 +0200 | From | Jens Axboe <> | Subject | [PATCH] perf: add support for specifying profile cpu for record |
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Hi,
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>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 6da0992..8e85543 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -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; @@ -425,6 +426,9 @@ 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 @@ -554,9 +558,13 @@ 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); @@ -635,6 +643,8 @@ 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, -- Jens Axboe
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