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Commit 9a92b479 authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar
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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: default avatarFrederic 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: default avatarIngo Molnar <mingo@elte.hu>
parent 016e92fb

tools/perf/builtin-sched.c

+39 −5
Original line number Diff line number Diff line
@@ -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;

tools/perf/util/thread.c

+25 −7
Original line number Diff line number Diff line
@@ -6,15 +6,17 @@ 
#include "util.h"

#include "debug.h"



static struct thread *thread__new(pid_t pid)

static struct thread *thread__new(pid_t pid, int set_comm)

{

	struct thread *self = calloc(1, sizeof(*self));



	if (self != NULL) {

		self->pid = pid;

		if (set_comm) {

			self->comm = malloc(32);

			if (self->comm)

				snprintf(self->comm, 32, ":%d", self->pid);

		}

		self->maps = RB_ROOT;

		INIT_LIST_HEAD(&self->removed_maps);

	}
@@ -50,8 +52,10 @@ static size_t thread__fprintf(struct thread *self, FILE *fp) 
	return ret;

}



struct thread *

threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match)

static struct thread *

__threads__findnew(pid_t pid, struct rb_root *threads,

		   struct thread **last_match,

		   int set_comm)

{

	struct rb_node **p = &threads->rb_node;

	struct rb_node *parent = NULL;
@@ -80,7 +84,8 @@ threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match) 
			p = &(*p)->rb_right;

	}



	th = thread__new(pid);

	th = thread__new(pid, set_comm);



	if (th != NULL) {

		rb_link_node(&th->rb_node, parent, p);

		rb_insert_color(&th->rb_node, threads);
@@ -90,6 +95,19 @@ threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match) 
	return th;

}



struct thread *

threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match)

{

	return __threads__findnew(pid, threads, last_match, 1);

}



struct thread *

threads__findnew_nocomm(pid_t pid, struct rb_root *threads,

			struct thread **last_match)

{

	return __threads__findnew(pid, threads, last_match, 0);

}



struct thread *

register_idle_thread(struct rb_root *threads, struct thread **last_match)

{

tools/perf/util/thread.h

+3 −0
Original line number Diff line number Diff line
@@ -18,6 +18,9 @@ int thread__set_comm(struct thread *self, const char *comm); 
struct thread *

threads__findnew(pid_t pid, struct rb_root *threads, struct thread **last_match);

struct thread *

threads__findnew_nocomm(pid_t pid, struct rb_root *threads,

			struct thread **last_match);

struct thread *

register_idle_thread(struct rb_root *threads, struct thread **last_match);

void thread__insert_map(struct thread *self, struct map *map);

int thread__fork(struct thread *self, struct thread *parent);