lkml.org 
[lkml]   [2018]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [RESEND PATCH] perf sched map: re-annotate shortname if thread comm changed
Hi,
On Fri, Mar 02, 2018 at 11:47:32PM +0900, Namhyung Kim wrote:
> Hi,
>
> On Fri, Mar 02, 2018 at 12:38:45PM +0100, Jiri Olsa wrote:
> > On Fri, Mar 02, 2018 at 06:52:54PM +0800, Du, Changbin wrote:
> > > Hello, any comment?
> >
> > sry, overlooked this one
> >
> > SNIP
> >
> > > > diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
> > > > index 68b65b1..c660fe6 100644
> > > > --- a/tools/perf/util/thread.c
> > > > +++ b/tools/perf/util/thread.c
> > > > @@ -212,6 +212,7 @@ static int ____thread__set_comm(struct thread *thread, const char *str,
> > > > unwind__flush_access(thread);
> > > > }
> > > >
> > > > + thread->comm_changed = true;
> > > > thread->comm_set = true;
> > > >
> > > > return 0;
> > > > diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h
> > > > index 40cfa36..b9a328b 100644
> > > > --- a/tools/perf/util/thread.h
> > > > +++ b/tools/perf/util/thread.h
> > > > @@ -27,6 +27,7 @@ struct thread {
> > > > int cpu;
> > > > refcount_t refcnt;
> > > > char shortname[3];
> > > > + bool comm_changed;
> >
> > I don't like that it's in struct thread and set by generic function,
> > and just one command (sched) checks/sets it back.. I'd rather see it
> > in thread::priv area..
>
> 100% agreed.
>
>
> > on the other hand it's simple enough and looks
> > like generic solution would be more tricky
>
> What about adding perf_sched__process_comm() to set it in the
> thread::priv?
>
I can be done, then thread->comm_changed moves to thread_runtime->comm_changed.
Draft code as below. It is also a little tricky.

+int perf_sched__process_comm(struct perf_tool *tool __maybe_unused,
+ union perf_event *event,
+ struct perf_sample *sample,
+ struct machine *machine)
+{
+ struct thread *thread;
+ struct thread_runtime *r;
+
+ perf_event__process_comm(tool, event, sample, machine);
+
+ thread = machine__findnew_thread(machine, pid, tid);
+ if (thread) {
+ r = thread__priv(thread);
+ if (r)
+ r->comm_changed = true;
+ thread__put(thread);
+ }
+}
+
static int perf_sched__read_events(struct perf_sched *sched)
{
const struct perf_evsel_str_handler handlers[] = {
@@ -3291,7 +3311,7 @@ int cmd_sched(int argc, const char **argv)
struct perf_sched sched = {
.tool = {
.sample = perf_sched__process_tracepoint_sample,
- .comm = perf_event__process_comm,
+ .comm = perf_sched__process_comm,


But I'd keep 'comm_changed' where 'shortname' is defined. I think they should appears
togother. And 'shortname' is only used by sched command, too.

So I still prefer my privous simpler change. Thanks!
> Thanks,
> Namhyung

--
Thanks,
Changbin Du

\
 
 \ /
  Last update: 2018-03-05 08:21    [W:0.069 / U:0.464 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site