perf record: Use per-task-per-cpu events for inherited events
Peter Zijlstra [Wed, 16 Dec 2009 16:55:56 +0000 (17:55 +0100)]
Create events with a pid and cpu contraint for inherited events
so that we get a stream per cpu, instead of all cpus contending
on a single stream.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: fweisbec@gmail.com
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091216165904.987643843@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-record.c

index 9b7c6d8..63136d0 100644 (file)
@@ -278,7 +278,7 @@ static void create_counter(int counter, int cpu, pid_t pid)
 
        attr->mmap              = track;
        attr->comm              = track;
-       attr->inherit           = (cpu < 0) && inherit;
+       attr->inherit           = inherit;
        attr->disabled          = 1;
 
 try_again:
@@ -537,7 +537,7 @@ static int __cmd_record(int argc __used, const char **argv)
        }
 
 
-       if (!system_wide || profile_cpu != -1) {
+       if ((!system_wide && !inherit) || profile_cpu != -1) {
                open_counters(profile_cpu, target_pid);
        } else {
                for (i = 0; i < nr_cpus; i++)