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authorFrederic Weisbecker <fweisbec@gmail.com>2009-10-08 16:37:12 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-08 16:56:33 +0200
commit9a92b479b2f088ee2d3194243f4c8e59b1b8c9c2 (patch)
tree000ea4a4e36e37af2867ba8aaf7cf38210373974 /tools/perf/builtin-sched.c
parent016e92fbc9ef33689cf654f343a94383d43235e7 (diff)
downloadop-kernel-dev-9a92b479b2f088ee2d3194243f4c8e59b1b8c9c2.zip
op-kernel-dev-9a92b479b2f088ee2d3194243f4c8e59b1b8c9c2.tar.gz
perf tools: Improve thread comm resolution in perf sched
When we get sched traces that involve a task that was already created before opening the event, we won't have the comm event for it. So if we can't find the comm event for a given thread, we look at the traces that may contain these informations. Before: ata/1:371 | 0.000 ms | 1 | avg: 3988.693 ms | max: 3988.693 ms | kondemand/1:421 | 0.096 ms | 3 | avg: 345.346 ms | max: 1035.989 ms | kondemand/0:420 | 0.025 ms | 3 | avg: 421.332 ms | max: 964.014 ms | :5124:5124 | 0.103 ms | 5 | avg: 74.082 ms | max: 277.194 ms | :6244:6244 | 0.691 ms | 9 | avg: 125.655 ms | max: 271.306 ms | firefox:5080 | 0.924 ms | 5 | avg: 53.833 ms | max: 257.828 ms | npviewer.bin:6225 | 21.871 ms | 53 | avg: 22.462 ms | max: 220.835 ms | :6245:6245 | 9.631 ms | 21 | avg: 41.864 ms | max: 213.349 ms | After: ata/1:371 | 0.000 ms | 1 | avg: 3988.693 ms | max: 3988.693 ms | kondemand/1:421 | 0.096 ms | 3 | avg: 345.346 ms | max: 1035.989 ms | kondemand/0:420 | 0.025 ms | 3 | avg: 421.332 ms | max: 964.014 ms | firefox:5124 | 0.103 ms | 5 | avg: 74.082 ms | max: 277.194 ms | npviewer.bin:6244 | 0.691 ms | 9 | avg: 125.655 ms | max: 271.306 ms | firefox:5080 | 0.924 ms | 5 | avg: 53.833 ms | max: 257.828 ms | npviewer.bin:6225 | 21.871 ms | 53 | avg: 22.462 ms | max: 220.835 ms | npviewer.bin:6245 | 9.631 ms | 21 | avg: 41.864 ms | max: 213.349 ms | Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1255012632-7882-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-sched.c')
-rw-r--r--tools/perf/builtin-sched.c44
1 files changed, 39 insertions, 5 deletions
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index e1df705..25b91e7 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1034,6 +1034,36 @@ add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
atoms->nb_atoms++;
}
+static struct thread *
+threads__findnew_from_ctx(u32 pid, struct trace_switch_event *switch_event)
+{
+ struct thread *th;
+
+ th = threads__findnew_nocomm(pid, &threads, &last_match);
+ if (th->comm)
+ return th;
+
+ if (pid == switch_event->prev_pid)
+ thread__set_comm(th, switch_event->prev_comm);
+ else
+ thread__set_comm(th, switch_event->next_comm);
+ return th;
+}
+
+static struct thread *
+threads__findnew_from_wakeup(struct trace_wakeup_event *wakeup_event)
+{
+ struct thread *th;
+
+ th = threads__findnew_nocomm(wakeup_event->pid, &threads, &last_match);
+ if (th->comm)
+ return th;
+
+ thread__set_comm(th, wakeup_event->comm);
+
+ return th;
+}
+
static void
latency_switch_event(struct trace_switch_event *switch_event,
struct event *event __used,
@@ -1059,8 +1089,10 @@ latency_switch_event(struct trace_switch_event *switch_event,
die("hm, delta: %Ld < 0 ?\n", delta);
- sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
- sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
+ sched_out = threads__findnew_from_ctx(switch_event->prev_pid,
+ switch_event);
+ sched_in = threads__findnew_from_ctx(switch_event->next_pid,
+ switch_event);
out_events = thread_atoms_search(&atom_root, sched_out, &cmp_pid);
if (!out_events) {
@@ -1126,7 +1158,7 @@ latency_wakeup_event(struct trace_wakeup_event *wakeup_event,
if (!wakeup_event->success)
return;
- wakee = threads__findnew(wakeup_event->pid, &threads, &last_match);
+ wakee = threads__findnew_from_wakeup(wakeup_event);
atoms = thread_atoms_search(&atom_root, wakee, &cmp_pid);
if (!atoms) {
thread_atoms_insert(wakee);
@@ -1386,8 +1418,10 @@ map_switch_event(struct trace_switch_event *switch_event,
die("hm, delta: %Ld < 0 ?\n", delta);
- sched_out = threads__findnew(switch_event->prev_pid, &threads, &last_match);
- sched_in = threads__findnew(switch_event->next_pid, &threads, &last_match);
+ sched_out = threads__findnew_from_ctx(switch_event->prev_pid,
+ switch_event);
+ sched_in = threads__findnew_from_ctx(switch_event->next_pid,
+ switch_event);
curr_thread[this_cpu] = sched_in;
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