Messages in this thread | | | Date | Mon, 5 May 2014 20:37:36 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH 3/3] perf tools: Clarify the output of perf sched map. |
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* Dongsheng Yang <yangds.fnst@cn.fujitsu.com> wrote:
> From: Dongsheng <yangds.fnst@cn.fujitsu.com> > > 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 explaination 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
Sounds good!
I only have some minor nits about the code:
> tools/perf/builtin-sched.c | 35 +++++++++++++++++++---------------- > 1 file changed, 19 insertions(+), 16 deletions(-) > > diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c > index 4f0dd21..c2bf8f2 100644 > --- a/tools/perf/builtin-sched.c > +++ b/tools/perf/builtin-sched.c > @@ -1300,17 +1300,23 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel, > > new_shortname = 0; > if (!sched_in->shortname[0]) { > - sched_in->shortname[0] = sched->next_shortname1; > - sched_in->shortname[1] = sched->next_shortname2; > - > - if (sched->next_shortname1 < 'Z') { > - sched->next_shortname1++; > - } else { > - sched->next_shortname1='A'; > - if (sched->next_shortname2 < '9') { > - sched->next_shortname2++; > + if (!strcmp(thread__comm_str(sched_in), "swapper")) { > + sched_in->shortname[0] = '.'; > + sched_in->shortname[1] = '\0'; > + } > + else {
Should be '} else {' as per kernel coding style.
Also, a comment about handling the idle task in a special way would be useful - for the far future when this discussion will be distant memories or less!
With those nits addressed:
Acked-by: Ingo Molnar <mingo@kernel.org>
Thanks,
Ingo
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