[RFC PATCH v1 26/37] perf evsel: add evsel__open_per_cpu_no_fallback function
From: Riccardo Mancini <hidden>
Date: 2021-08-21 09:22:03
Also in:
lkml
Subsystem:
performance events subsystem, the rest · Maintainers:
Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo, Namhyung Kim, Linus Torvalds
This function is equivalent to evsel__open, but without any fallback mechanism, which should be handled separately. It is also possible to a starting thread to be able to resume a previous failing evsel__open_per_cpu_no_fallback. Signed-off-by: Riccardo Mancini <redacted> --- tools/perf/util/evsel.c | 44 +++++++++++++++++++++++++++++++++++++++++ tools/perf/util/evsel.h | 9 +++++++++ 2 files changed, 53 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index e41f55a7a70ea630..74aad07f3c1102cb 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c@@ -2021,6 +2021,50 @@ static struct perf_event_open_result perf_event_open(struct evsel *evsel, return res; } +struct evsel_open_result evsel__open_per_cpu_no_fallback(struct evsel *evsel, + struct perf_cpu_map *cpus, + struct perf_thread_map *threads, + int cpu, int start_thread) +{ + int thread, nthreads, pid = -1; + struct evsel_open_result res = { .thread = start_thread }; + + if (cpus == NULL) + cpus = empty_cpu_map; + + if (threads == NULL) + threads = empty_thread_map; + + if (evsel->core.system_wide) + nthreads = 1; + else + nthreads = threads->nr; + + if (evsel->cgrp) + pid = evsel->cgrp->fd; + + display_attr(&evsel->core.attr); + + + for (thread = start_thread; thread < nthreads; thread++) { + res.peo_res = perf_event_open(evsel, pid, cpu, thread, cpus, + threads); + + switch (res.peo_res.err) { + case PEO_SUCCESS: + continue; + case PEO_FALLBACK: + goto out; + default: + case PEO_ERROR: + goto out; + } + } +out: + res.thread = thread; + return res; +} + static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, struct perf_thread_map *threads, int start_cpu, int end_cpu)
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 8c9827a93ac001a7..fa0d732d0a088016 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h@@ -294,10 +294,19 @@ struct perf_event_open_result { int fd; }; +struct evsel_open_result { + int thread; + struct perf_event_open_result peo_res; +}; + int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu); int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads); int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus, struct perf_thread_map *threads); +struct evsel_open_result evsel__open_per_cpu_no_fallback(struct evsel *evsel, + struct perf_cpu_map *cpus, + struct perf_thread_map *threads, + int cpu, int start_thread); void evsel__close(struct evsel *evsel); int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus, struct perf_thread_map *threads);
--
2.31.1