Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 12:11:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

perf evlist: Allow reusing the side band thread for more purposes

Browse Source 
I.e. so far we had just one event in that side band thread, a dummy one
with attr.bpf_event set, so that 'perf record' can go ahead and ask the
kernel for further information about BPF programs being loaded.

Allow for more than one event to be there, so that we can use it as
well for the upcoming --switch-output-event feature.

Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Link: http://lore.kernel.org/lkml/20200429131106.27974-6-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2020-04-27 17:54:27 -03:00
parent 9a39994467
commit 976be84504
2 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
tools/perf/util/evlist.h
View File

@ -111,6 +111,7 @@ int perf_evlist__add_sb_event(struct evlist *evlist,
struct perf_event_attr *attr,
perf_evsel__sb_cb_t cb,
void *data);
void evlist__set_cb(struct evlist *evlist, perf_evsel__sb_cb_t cb, void *data);
int perf_evlist__start_sb_thread(struct evlist *evlist,
struct target *target);
void perf_evlist__stop_sb_thread(struct evlist *evlist);

23
tools/perf/util/sideband_evlist.c
View File

@ -4,6 +4,7 @@
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/mmap.h"
#include "util/perf_api_probe.h"
#include <perf/mmap.h>
#include <linux/perf_event.h>
#include <limits.h>
@ -80,6 +81,19 @@ static void *perf_evlist__poll_thread(void *arg)
return NULL;
}
void evlist__set_cb(struct evlist *evlist, perf_evsel__sb_cb_t cb, void *data)
{
struct evsel *evsel;
evlist__for_each_entry(evlist, evsel) {
evsel->core.attr.sample_id_all = 1;
evsel->core.attr.watermark = 1;
evsel->core.attr.wakeup_watermark = 1;
evsel->side_band.cb = cb;
evsel->side_band.data = data;
}
}
int perf_evlist__start_sb_thread(struct evlist *evlist, struct target *target)
{
struct evsel *counter;
@ -90,6 +104,15 @@ int perf_evlist__start_sb_thread(struct evlist *evlist, struct target *target)
if (perf_evlist__create_maps(evlist, target))
goto out_delete_evlist;
if (evlist->core.nr_entries > 1) {
bool can_sample_identifier = perf_can_sample_identifier();
evlist__for_each_entry(evlist, counter)
perf_evsel__set_sample_id(counter, can_sample_identifier);
perf_evlist__set_id_pos(evlist);
}
evlist__for_each_entry(evlist, counter) {
if (evsel__open(counter, evlist->core.cpus, evlist->core.threads) < 0)
goto out_delete_evlist;