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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-04 15:09:33 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-06 02:03:55 +0200 |
| commit | d2c11034406733374d1cdc588c53bb076d95a4e2 (patch) | |
| tree | 02982c3afd746b12a094f306a7c84a7494dd1861 /tools/perf/util/machine.c | |
| parent | perf/x86/intel/pt: Convert ACCESS_ONCE()s (diff) | |
| download | linux-d2c11034406733374d1cdc588c53bb076d95a4e2.tar.xz linux-d2c11034406733374d1cdc588c53bb076d95a4e2.zip | |
perf machine: Introduce number of threads member
To be used, for instance, for pre-allocating an rb_tree array for
sorting by other keys besides the current pid one.
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Milian Wolff <milian.wolff@kdab.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-ja0ifkwue7ttjhbwijn6g6eu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/machine.c')
| -rw-r--r-- | tools/perf/util/machine.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 2cb95bbf9ea6..9d0913107dc7 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -32,6 +32,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid) machine->threads = RB_ROOT; pthread_rwlock_init(&machine->threads_lock, NULL); + machine->nr_threads = 0; INIT_LIST_HEAD(&machine->dead_threads); machine->last_match = NULL; @@ -430,6 +431,7 @@ static struct thread *____machine__findnew_thread(struct machine *machine, */ thread__get(th); machine->last_match = th; + ++machine->nr_threads; } return th; @@ -681,11 +683,13 @@ size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) size_t machine__fprintf(struct machine *machine, FILE *fp) { - size_t ret = 0; + size_t ret; struct rb_node *nd; pthread_rwlock_rdlock(&machine->threads_lock); + ret = fprintf(fp, "Threads: %u\n", machine->nr_threads); + for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) { struct thread *pos = rb_entry(nd, struct thread, rb_node); @@ -1419,6 +1423,7 @@ static void __machine__remove_thread(struct machine *machine, struct thread *th, pthread_rwlock_wrlock(&machine->threads_lock); rb_erase_init(&th->rb_node, &machine->threads); RB_CLEAR_NODE(&th->rb_node); + --machine->nr_threads; /* * Move it first to the dead_threads list, then drop the reference, * if this is the last reference, then the thread__delete destructor |