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perf tools: Add evlist__disable_evsel/evlist__enable_evsel

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Adding interface to enable/disable single event in the evlist based on
its name. It will be used later in new control enable/disable interface.

Keeping the evlist::enabled true when one or more events are enabled so
the toggle can work properly and toggle evlist to disabled state.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Alexei Budankov <abudankov@huawei.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20201210204330.233864-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-12-10 21:43:28 +01:00 committed by Arnaldo Carvalho de Melo
parent 96aea4daa6
commit 7cfcd1e016
2 changed files with 68 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
tools/perf/util/evlist.c
View File

@ -381,7 +381,30 @@ bool evsel__cpu_iter_skip(struct evsel *ev, int cpu)
return true;
}
void evlist__disable(struct evlist *evlist)
static int evsel__strcmp(struct evsel *pos, char *evsel_name)
{
if (!evsel_name)
return 0;
if (evsel__is_dummy_event(pos))
return 1;
return strcmp(pos->name, evsel_name);
}
static int evlist__is_enabled(struct evlist *evlist)
{
struct evsel *pos;
evlist__for_each_entry(evlist, pos) {
if (!evsel__is_group_leader(pos) || !pos->core.fd)
continue;
/* If at least one event is enabled, evlist is enabled. */
if (!pos->disabled)
return true;
}
return false;
}
static void __evlist__disable(struct evlist *evlist, char *evsel_name)
{
struct evsel *pos;
struct affinity affinity;
@ -397,6 +420,8 @@ void evlist__disable(struct evlist *evlist)
affinity__set(&affinity, cpu);
evlist__for_each_entry(evlist, pos) {
if (evsel__strcmp(pos, evsel_name))
continue;
if (evsel__cpu_iter_skip(pos, cpu))
continue;
if (pos->disabled || !evsel__is_group_leader(pos) || !pos->core.fd)
@ -414,15 +439,34 @@ void evlist__disable(struct evlist *evlist)
affinity__cleanup(&affinity);
evlist__for_each_entry(evlist, pos) {
if (evsel__strcmp(pos, evsel_name))
continue;
if (!evsel__is_group_leader(pos) || !pos->core.fd)
continue;
pos->disabled = true;
}
/*
* If we disabled only single event, we need to check
* the enabled state of the evlist manually.
*/
if (evsel_name)
evlist->enabled = evlist__is_enabled(evlist);
else
evlist->enabled = false;
}
void evlist__enable(struct evlist *evlist)
void evlist__disable(struct evlist *evlist)
{
__evlist__disable(evlist, NULL);
}
void evlist__disable_evsel(struct evlist *evlist, char *evsel_name)
{
__evlist__disable(evlist, evsel_name);
}
static void __evlist__enable(struct evlist *evlist, char *evsel_name)
{
struct evsel *pos;
struct affinity affinity;
@ -435,6 +479,8 @@ void evlist__enable(struct evlist *evlist)
affinity__set(&affinity, cpu);
evlist__for_each_entry(evlist, pos) {
if (evsel__strcmp(pos, evsel_name))
continue;
if (evsel__cpu_iter_skip(pos, cpu))
continue;
if (!evsel__is_group_leader(pos) || !pos->core.fd)
@ -444,14 +490,31 @@ void evlist__enable(struct evlist *evlist)
}
affinity__cleanup(&affinity);
evlist__for_each_entry(evlist, pos) {
if (evsel__strcmp(pos, evsel_name))
continue;
if (!evsel__is_group_leader(pos) || !pos->core.fd)
continue;
pos->disabled = false;
}
/*
* Even single event sets the 'enabled' for evlist,
* so the toggle can work properly and toggle to
* 'disabled' state.
*/
evlist->enabled = true;
}
void evlist__enable(struct evlist *evlist)
{
__evlist__enable(evlist, NULL);
}
void evlist__enable_evsel(struct evlist *evlist, char *evsel_name)
{
__evlist__enable(evlist, evsel_name);
}
void evlist__toggle_enable(struct evlist *evlist)
{
(evlist->enabled ? evlist__disable : evlist__enable)(evlist);

2
tools/perf/util/evlist.h
View File

@ -186,6 +186,8 @@ size_t evlist__mmap_size(unsigned long pages);
void evlist__disable(struct evlist *evlist);
void evlist__enable(struct evlist *evlist);
void evlist__toggle_enable(struct evlist *evlist);
void evlist__disable_evsel(struct evlist *evlist, char *evsel_name);
void evlist__enable_evsel(struct evlist *evlist, char *evsel_name);
int evlist__enable_event_idx(struct evlist *evlist, struct evsel *evsel, int idx);