Em Mon, Mar 05, 2018 at 10:03:39AM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Sat, Mar 03, 2018 at 12:30:22AM +0100, Jiri Olsa escreveu:
> > On Thu, Mar 01, 2018 at 06:08:59PM -0500, [email protected] wrote:
> > > From: Kan Liang <[email protected]>
> > > The perf trace still use the legacy interface.
> > > +++ b/tools/perf/builtin-trace.c
> > > @@ -2472,8 +2472,14 @@ static int trace__run(struct trace *trace, int
> > > argc, const char **argv)
> > >
> > > for (i = 0; i < evlist->nr_mmaps; i++) {
> > > union perf_event *event;
> > > + struct perf_mmap *md;
> > > + u64 end, start;
> > >
> > > - while ((event = perf_evlist__mmap_read(evlist, i)) != NULL) {
> > > + md = &evlist->mmap[i];
> > > + if (perf_mmap__read_init(md, 0, &start, &end) < 0)
> > > + continue;
> > > +
> > > + while ((event = perf_mmap__read_event(md, 0, &start, end)) !=
> > > NULL) {
> > > struct perf_sample sample;
> > >
> > > ++trace->nr_events;
> > > @@ -2486,7 +2492,7 @@ static int trace__run(struct trace *trace, int
> > > argc, const char **argv)
> > >
> > > trace__handle_event(trace, event, &sample);
> > > next_event:
> > > - perf_evlist__mmap_consume(evlist, i);
> > > + perf_mmap__consume(md, 0);
> >
> > could you call this with 'false' instead of 0, it's 'bool overwrite'
> > applies also to the rest of the patchset
>
> I'm doing this, the argument is 'bool', so the value should be false or
> true, even '0' being way shorter...
While doing that I wonder why is that we can't do it without those
explicit start/end variables in all the call sites and passing
overwrite, start and end as parameters...
Can't we just add 'overwrite, 'start' and 'end' to struct perf_mmap,
then have perf_mmap__read_init() with just 'md' and 'overwrite' as
parameters, initialize md->{start,end} and set md->overwrite to the
'overwrite' parameter in 'perf_mmap__read_init()' and then use just
md as parameters for both perf_mmap__read_event() and
perf_mmap__consume()?
What am I missing to have this much simpler without all this
boilerplate?
Anyway, finishing the s/0/false/g, will leave this for later, but please
comment on it.
- Arnaldo
