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perf machine: Introduce number of threads member

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2016-05-04 10:09:33 -03:00
parent 1b6de59171
commit d2c1103440
2 changed files with 7 additions and 1 deletions
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7
tools/perf/util/machine.c
View File

@ -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

1
tools/perf/util/machine.h
View File

@ -31,6 +31,7 @@ struct machine {
char *root_dir;
struct rb_root threads;
pthread_rwlock_t threads_lock;
unsigned int nr_threads;
struct list_head dead_threads;
struct thread *last_match;
struct vdso_info *vdso_info;