perf evlist: Factor out a function to propagate maps for a single evsel

[firefly-linux-kernel-4.4.55.git] / tools / perf / util / record.c

diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index d457c523a33d8bb7d00669dbd09e589eecf6de4b..0467367dc31551122c47e0274e01ac48378c5a6e 100644 (file)
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -64,7 +64,7 @@ static bool perf_probe_api(setup_probe_fn_t fn)
        if (!cpus)
                return false;
        cpu = cpus->map[0];
-       cpu_map__delete(cpus);
+       cpu_map__put(cpus);
 
        do {
                ret = perf_do_probe_api(fn, cpu, try[i++]);
@@ -85,6 +85,11 @@ static void perf_probe_comm_exec(struct perf_evsel *evsel)
        evsel->attr.comm_exec = 1;
 }
 
+static void perf_probe_context_switch(struct perf_evsel *evsel)
+{
+       evsel->attr.context_switch = 1;
+}
+
 bool perf_can_sample_identifier(void)
 {
        return perf_probe_api(perf_probe_sample_identifier);
@@ -95,6 +100,35 @@ static bool perf_can_comm_exec(void)
        return perf_probe_api(perf_probe_comm_exec);
 }
 
+bool perf_can_record_switch_events(void)
+{
+       return perf_probe_api(perf_probe_context_switch);
+}
+
+bool perf_can_record_cpu_wide(void)
+{
+       struct perf_event_attr attr = {
+               .type = PERF_TYPE_SOFTWARE,
+               .config = PERF_COUNT_SW_CPU_CLOCK,
+               .exclude_kernel = 1,
+       };
+       struct cpu_map *cpus;
+       int cpu, fd;
+
+       cpus = cpu_map__new(NULL);
+       if (!cpus)
+               return false;
+       cpu = cpus->map[0];
+       cpu_map__put(cpus);
+
+       fd = sys_perf_event_open(&attr, -1, cpu, -1, 0);
+       if (fd < 0)
+               return false;
+       close(fd);
+
+       return true;
+}
+
 void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts)
 {
        struct perf_evsel *evsel;
@@ -226,7 +260,7 @@ bool perf_evlist__can_select_event(struct perf_evlist *evlist, const char *str)
                struct cpu_map *cpus = cpu_map__new(NULL);
 
                cpu =  cpus ? cpus->map[0] : 0;
-               cpu_map__delete(cpus);
+               cpu_map__put(cpus);
        } else {
                cpu = evlist->cpus->map[0];
        }