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perf kwork: Overwrite original atom in the list when a new atom is pushed.

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work_push_atom() supports nesting. Currently, all supported kworks are not
nested. A `overwrite` parameter is added to overwrite the original atom in
the list.

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Sandipan Das <sandipan.das@amd.com>
Link: https://lore.kernel.org/r/20230812084917.169338-6-yangjihong1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Yang Jihong 2023-08-12 08:49:06 +00:00 committed by Arnaldo Carvalho de Melo
parent 95064b3352
commit 86c67c8af4
1 changed files with 18 additions and 6 deletions
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24
tools/perf/builtin-kwork.c
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@ -392,9 +392,10 @@ static int work_push_atom(struct perf_kwork *kwork,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine,
struct kwork_work **ret_work)
struct kwork_work **ret_work,
bool overwrite)
{
struct kwork_atom *atom, *dst_atom;
struct kwork_atom *atom, *dst_atom, *last_atom;
struct kwork_work *work, key;
BUG_ON(class->work_init == NULL);
@ -427,6 +428,17 @@ static int work_push_atom(struct perf_kwork *kwork,
if (ret_work != NULL)
*ret_work = work;
if (overwrite) {
last_atom = list_last_entry_or_null(&work->atom_list[src_type],
struct kwork_atom, list);
if (last_atom) {
atom_del(last_atom);
kwork->nr_skipped_events[src_type]++;
kwork->nr_skipped_events[KWORK_TRACE_MAX]++;
}
}
list_add_tail(&atom->list, &work->atom_list[src_type]);
return 0;
@ -502,7 +514,7 @@ static int report_entry_event(struct perf_kwork *kwork,
{
return work_push_atom(kwork, class, KWORK_TRACE_ENTRY,
KWORK_TRACE_MAX, evsel, sample,
machine, NULL);
machine, NULL, true);
}
static int report_exit_event(struct perf_kwork *kwork,
@ -557,7 +569,7 @@ static int latency_raise_event(struct perf_kwork *kwork,
{
return work_push_atom(kwork, class, KWORK_TRACE_RAISE,
KWORK_TRACE_MAX, evsel, sample,
machine, NULL);
machine, NULL, true);
}
static int latency_entry_event(struct perf_kwork *kwork,
@ -716,7 +728,7 @@ static int timehist_raise_event(struct perf_kwork *kwork,
{
return work_push_atom(kwork, class, KWORK_TRACE_RAISE,
KWORK_TRACE_MAX, evsel, sample,
machine, NULL);
machine, NULL, true);
}
static int timehist_entry_event(struct perf_kwork *kwork,
@ -730,7 +742,7 @@ static int timehist_entry_event(struct perf_kwork *kwork,
ret = work_push_atom(kwork, class, KWORK_TRACE_ENTRY,
KWORK_TRACE_RAISE, evsel, sample,
machine, &work);
machine, &work, true);
if (ret)
return ret;