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Commit 83e815ee authored by Jiri Olsa's avatar Jiri Olsa Committed by Arnaldo Carvalho de Melo
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tools lib traceevent: Add sched_switch plugin 

Backporting sched_switch plugin.

Backported from Steven Rostedt's trace-cmd repo (HEAD 0f2c2fb):
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git



This plugin adds fields resolving for sched:sched_switch tracepoint
event.

The diff of 'perf script' output generated by old and new code:
(data was generated by 'perf record -e sched:sched_switch -a')

  --- script.sched_switch.old
  +++ script.sched_switch.new
  -            perf   577 [002] 30965.311852: sched:sched_switch: prev_comm=perf prev_pid=577 prev_prio=120 prev_state=S ==> next_comm=swapper/2 next_pid=0 next_prio=120
  +            perf   577 [002] 30965.311852: sched:sched_switch: perf:577 [120] S ==> swapper/2:0 [120]

Signed-off-by: default avatarJiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/1386076182-14484-18-git-send-email-jolsa@redhat.com


Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent de705e2e

tools/lib/traceevent/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -217,6 +217,7 @@ PLUGIN_OBJS += plugin_hrtimer.o 
PLUGIN_OBJS += plugin_kmem.o

PLUGIN_OBJS += plugin_kvm.o

PLUGIN_OBJS += plugin_mac80211.o

PLUGIN_OBJS += plugin_sched_switch.o



PLUGINS := $(PLUGIN_OBJS:.o=.so)

tools/lib/traceevent/plugin_sched_switch.c

0 → 100644
+148 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation;

 * version 2.1 of the License (not later!)

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this program; if not,  see <http://www.gnu.org/licenses>

 *

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>



#include "event-parse.h"



static void write_state(struct trace_seq *s, int val)

{

	const char states[] = "SDTtZXxW";

	int found = 0;

	int i;



	for (i = 0; i < (sizeof(states) - 1); i++) {

		if (!(val & (1 << i)))

			continue;



		if (found)

			trace_seq_putc(s, '|');



		found = 1;

		trace_seq_putc(s, states[i]);

	}



	if (!found)

		trace_seq_putc(s, 'R');

}



static void write_and_save_comm(struct format_field *field,

				struct pevent_record *record,

				struct trace_seq *s, int pid)

{

	const char *comm;

	int len;



	comm = (char *)(record->data + field->offset);

	len = s->len;

	trace_seq_printf(s, "%.*s",

			 field->size, comm);



	/* make sure the comm has a \0 at the end. */

	trace_seq_terminate(s);

	comm = &s->buffer[len];



	/* Help out the comm to ids. This will handle dups */

	pevent_register_comm(field->event->pevent, comm, pid);

}



static int sched_wakeup_handler(struct trace_seq *s,

				struct pevent_record *record,

				struct event_format *event, void *context)

{

	struct format_field *field;

	unsigned long long val;



	if (pevent_get_field_val(s, event, "pid", record, &val, 1))

		return trace_seq_putc(s, '!');



	field = pevent_find_any_field(event, "comm");

	if (field) {

		write_and_save_comm(field, record, s, val);

		trace_seq_putc(s, ':');

	}

	trace_seq_printf(s, "%lld", val);



	if (pevent_get_field_val(s, event, "prio", record, &val, 0) == 0)

		trace_seq_printf(s, " [%lld]", val);



	if (pevent_get_field_val(s, event, "success", record, &val, 1) == 0)

		trace_seq_printf(s, " success=%lld", val);



	if (pevent_get_field_val(s, event, "target_cpu", record, &val, 0) == 0)

		trace_seq_printf(s, " CPU:%03llu", val);



	return 0;

}



static int sched_switch_handler(struct trace_seq *s,

				struct pevent_record *record,

				struct event_format *event, void *context)

{

	struct format_field *field;

	unsigned long long val;



	if (pevent_get_field_val(s, event, "prev_pid", record, &val, 1))

		return trace_seq_putc(s, '!');



	field = pevent_find_any_field(event, "prev_comm");

	if (field) {

		write_and_save_comm(field, record, s, val);

		trace_seq_putc(s, ':');

	}

	trace_seq_printf(s, "%lld ", val);



	if (pevent_get_field_val(s, event, "prev_prio", record, &val, 0) == 0)

		trace_seq_printf(s, "[%lld] ", val);



	if (pevent_get_field_val(s,  event, "prev_state", record, &val, 0) == 0)

		write_state(s, val);



	trace_seq_puts(s, " ==> ");



	if (pevent_get_field_val(s, event, "next_pid", record, &val, 1))

		return trace_seq_putc(s, '!');



	field = pevent_find_any_field(event, "next_comm");

	if (field) {

		write_and_save_comm(field, record, s, val);

		trace_seq_putc(s, ':');

	}

	trace_seq_printf(s, "%lld", val);



	if (pevent_get_field_val(s, event, "next_prio", record, &val, 0) == 0)

		trace_seq_printf(s, " [%lld]", val);



	return 0;

}



int PEVENT_PLUGIN_LOADER(struct pevent *pevent)

{

	pevent_register_event_handler(pevent, -1, "sched", "sched_switch",

				      sched_switch_handler, NULL);



	pevent_register_event_handler(pevent, -1, "sched", "sched_wakeup",

				      sched_wakeup_handler, NULL);



	pevent_register_event_handler(pevent, -1, "sched", "sched_wakeup_new",

				      sched_wakeup_handler, NULL);

	return 0;

}