Commit 6bcab4e1 authored May 06, 2014 by Dongsheng Committed by Jiri Olsa May 12, 2014

perf tools: Clarify the output of perf sched map.



In output of perf sched map, any shortname of thread will be explained
at the first time when it appear.

Example:
              *A0       228836.978985 secs A0 => perf:23032
          *.   A0       228836.979016 secs B0 => swapper:0
           .  *C0       228836.979099 secs C0 => migration/3:22
  *A0      .   C0       228836.979115 secs
   A0      .  *.        228836.979115 secs

But B0, which is explained as swapper:0 did not appear in the
left part of output. Instead, we use '.' as the shortname of
swapper:0. So the comment of "B0 => swapper:0" is not easy to
understand.

This patch clarify the output of perf sched map with not allocating
one letter-number shortname for swapper:0 and print ". => swapper:0"
as the explanation for swapper:0.

Example:
              *A0       228836.978985 secs A0 => perf:23032
          * .  A0       228836.979016 secs .  => swapper:0
            . *B0       228836.979099 secs B0 => migration/3:22
  *A0       .  B0       228836.979115 secs
   A0       . * .       228836.979115 secs
   A0     *C0   .       228836.979225 secs C0 => ksoftirqd/2:18
   A0     *D0   .       228836.979236 secs D0 => rcu_sched:7

Signed-off-by: Dongsheng <yangds.fnst@cn.fujitsu.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/1399354741-19522-1-git-send-email-yangds.fnst@cn.fujitsu.com


[ small style fixes to make checkpatch happy ]
Signed-off-by: Jiri Olsa <jolsa@kernel.org>

parent e936e8e4

tools/perf/builtin-sched.c

+20 −15

Original line number	Diff line number	Diff line
		@@ -1300,6 +1300,14 @@ static int map_switch_event(struct perf_sched sched, struct perf_evsel evsel,

		new_shortname = 0;
		if (!sched_in->shortname[0]) {
		if (!strcmp(thread__comm_str(sched_in), "swapper")) {
		/*
		* Don't allocate a letter-number for swapper:0
		* as a shortname. Instead, we use '.' for it.
		*/
		sched_in->shortname[0] = '.';
		sched_in->shortname[1] = ' ';
		} else {
		sched_in->shortname[0] = sched->next_shortname1;
		sched_in->shortname[1] = sched->next_shortname2;

		@@ -1307,9 +1315,9 @@ static int map_switch_event(struct perf_sched sched, struct perf_evsel evsel,
		sched->next_shortname1++;
		} else {
		sched->next_shortname1 = 'A';
		if (sched->next_shortname2 < '9') {
		if (sched->next_shortname2 < '9')
		sched->next_shortname2++;
		} else {
		else
		sched->next_shortname2 = '0';
		}
		}
		@@ -1322,12 +1330,9 @@ static int map_switch_event(struct perf_sched sched, struct perf_evsel evsel,
		else
		printf("*");

		if (sched->curr_thread[cpu]) {
		if (sched->curr_thread[cpu]->tid)
		if (sched->curr_thread[cpu])
		printf("%2s ", sched->curr_thread[cpu]->shortname);
		else
		printf(". ");
		} else
		printf(" ");
		}