[tip:perf/core] perf evsel: Allow specifying if the inherit bit should be set

tip-bot for Arnaldo Carvalho de Melo
2011-01-26T07:15:49Z

Commit-ID: 9d04f1781772e11bd58806391555fc23ebb54377
Gitweb: http://git.kernel.org/tip/9d04f1781772e11bd58806391555fc23ebb54377
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Wed, 12 Jan 2011 00:08:18 -0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Sat, 22 Jan 2011 19:56:29 -0200

perf evsel: Allow specifying if the inherit bit should be set

As this is a per-cpu attribute, we can't set it up in advance and use it
for all the calls.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-stat.c | 4 ++--
tools/perf/builtin-test.c | 4 ++--
tools/perf/util/evsel.c | 16 +++++++++-------
tools/perf/util/evsel.h | 6 +++---
4 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index b5fe522..e2a2d02 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -169,7 +169,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)
PERF_FORMAT_TOTAL_TIME_RUNNING;

if (system_wide)
- return perf_evsel__open_per_cpu(evsel, cpus, false);
+ return perf_evsel__open_per_cpu(evsel, cpus, false, false);

attr->inherit = !no_inherit;
if (target_pid == -1 && target_tid == -1) {
@@ -177,7 +177,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel)
attr->enable_on_exec = 1;
}

- return perf_evsel__open_per_thread(evsel, threads, false);
+ return perf_evsel__open_per_thread(evsel, threads, false, false);
}

/*
diff --git a/tools/perf/builtin-test.c b/tools/perf/builtin-test.c
index 4282d67..7287158 100644
--- a/tools/perf/builtin-test.c
+++ b/tools/perf/builtin-test.c
@@ -289,7 +289,7 @@ static int test__open_syscall_event(void)
goto out_thread_map_delete;
}

- if (perf_evsel__open_per_thread(evsel, threads, false) < 0) {
+ if (perf_evsel__open_per_thread(evsel, threads, false, false) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
@@ -364,7 +364,7 @@ static int test__open_syscall_event_on_all_cpus(void)
goto out_thread_map_delete;
}

- if (perf_evsel__open(evsel, cpus, threads, false) < 0) {
+ if (perf_evsel__open(evsel, cpus, threads, false, false) < 0) {
pr_debug("failed to open counter: %s, "
"tweak /proc/sys/kernel/perf_event_paranoid?\n",
strerror(errno));
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index da473ec..82a0053 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -128,7 +128,7 @@ int __perf_evsel__read(struct perf_evsel *evsel,
}

static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group, bool inherit)
{
int cpu, thread;

@@ -139,6 +139,8 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
for (cpu = 0; cpu < cpus->nr; cpu++) {
int group_fd = -1;

+ evsel->attr.inherit = (cpus->map[cpu] < 0) && inherit;
+
for (thread = 0; thread < threads->nr; thread++) {
FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
threads->map[thread],
@@ -182,7 +184,7 @@ static struct {
};

int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group, bool inherit)
{
if (cpus == NULL) {
/* Work around old compiler warnings about strict aliasing */
@@ -192,17 +194,17 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
if (threads == NULL)
threads = &empty_thread_map.map;

- return __perf_evsel__open(evsel, cpus, threads, group);
+ return __perf_evsel__open(evsel, cpus, threads, group, inherit);
}

int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group)
+ struct cpu_map *cpus, bool group, bool inherit)
{
- return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group);
+ return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group, inherit);
}

int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group)
+ struct thread_map *threads, bool group, bool inherit)
{
- return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group);
+ return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group, inherit);
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 0962b50..1594696 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -46,11 +46,11 @@ void perf_evsel__free_fd(struct perf_evsel *evsel);
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads);

int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group);
+ struct cpu_map *cpus, bool group, bool inherit);
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group);
+ struct thread_map *threads, bool group, bool inherit);
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group);
+ struct thread_map *threads, bool group, bool inherit);

#define perf_evsel__match(evsel, t, c) \
(evsel->attr.type == PERF_TYPE_##t && \