forked from Minki/linux
perf evlist: Default to syswide target when no thread/cpu maps set
If all a tool wants is to do system wide event monitoring, there is no more the need to setup thread_map and cpu_map objects, just call perf_evlist__open() and it will do create one fd per CPU monitoring all threads. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-poovolkigu72brx4783uq4cf@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
1aaf63b1ee
commit
4112eb1899
@ -1175,11 +1175,51 @@ void perf_evlist__close(struct perf_evlist *evlist)
|
||||
}
|
||||
}
|
||||
|
||||
static int perf_evlist__create_syswide_maps(struct perf_evlist *evlist)
|
||||
{
|
||||
int err = -ENOMEM;
|
||||
|
||||
/*
|
||||
* Try reading /sys/devices/system/cpu/online to get
|
||||
* an all cpus map.
|
||||
*
|
||||
* FIXME: -ENOMEM is the best we can do here, the cpu_map
|
||||
* code needs an overhaul to properly forward the
|
||||
* error, and we may not want to do that fallback to a
|
||||
* default cpu identity map :-\
|
||||
*/
|
||||
evlist->cpus = cpu_map__new(NULL);
|
||||
if (evlist->cpus == NULL)
|
||||
goto out;
|
||||
|
||||
evlist->threads = thread_map__new_dummy();
|
||||
if (evlist->threads == NULL)
|
||||
goto out_free_cpus;
|
||||
|
||||
err = 0;
|
||||
out:
|
||||
return err;
|
||||
out_free_cpus:
|
||||
cpu_map__delete(evlist->cpus);
|
||||
evlist->cpus = NULL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
int perf_evlist__open(struct perf_evlist *evlist)
|
||||
{
|
||||
struct perf_evsel *evsel;
|
||||
int err;
|
||||
|
||||
/*
|
||||
* Default: one fd per CPU, all threads, aka systemwide
|
||||
* as sys_perf_event_open(cpu = -1, thread = -1) is EINVAL
|
||||
*/
|
||||
if (evlist->threads == NULL && evlist->cpus == NULL) {
|
||||
err = perf_evlist__create_syswide_maps(evlist);
|
||||
if (err < 0)
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
perf_evlist__update_id_pos(evlist);
|
||||
|
||||
evlist__for_each(evlist, evsel) {
|
||||
|
Loading…
Reference in New Issue
Block a user