mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 02:52:22 +00:00
56dce86819
The existing API perf_thread_map__new_dummy() allocates new thread map for one thread. I couldn't find a way to reallocate the map with more threads, or to allocate a new map for more than one thread. Having multiple threads in a thread map is essential for some use cases. That's why a new API is proposed, which allocates a new thread map for given number of threads: perf_thread_map__new_array() Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Ian Rogers <irogers@google.com> Link: https://lore.kernel.org/linux-perf-users/20220221102628.43904-1-tz.stoyanov@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <perf/threadmap.h>
|
|
#include <stdlib.h>
|
|
#include <linux/refcount.h>
|
|
#include <internal/threadmap.h>
|
|
#include <string.h>
|
|
#include <asm/bug.h>
|
|
#include <stdio.h>
|
|
|
|
static void perf_thread_map__reset(struct perf_thread_map *map, int start, int nr)
|
|
{
|
|
size_t size = (nr - start) * sizeof(map->map[0]);
|
|
|
|
memset(&map->map[start], 0, size);
|
|
map->err_thread = -1;
|
|
}
|
|
|
|
struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr)
|
|
{
|
|
size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
|
|
int start = map ? map->nr : 0;
|
|
|
|
map = realloc(map, size);
|
|
/*
|
|
* We only realloc to add more items, let's reset new items.
|
|
*/
|
|
if (map)
|
|
perf_thread_map__reset(map, start, nr);
|
|
|
|
return map;
|
|
}
|
|
|
|
#define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
|
|
|
|
void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid)
|
|
{
|
|
map->map[idx].pid = pid;
|
|
}
|
|
|
|
char *perf_thread_map__comm(struct perf_thread_map *map, int idx)
|
|
{
|
|
return map->map[idx].comm;
|
|
}
|
|
|
|
struct perf_thread_map *perf_thread_map__new_array(int nr_threads, pid_t *array)
|
|
{
|
|
struct perf_thread_map *threads = thread_map__alloc(nr_threads);
|
|
int i;
|
|
|
|
if (!threads)
|
|
return NULL;
|
|
|
|
for (i = 0; i < nr_threads; i++)
|
|
perf_thread_map__set_pid(threads, i, array ? array[i] : -1);
|
|
|
|
threads->nr = nr_threads;
|
|
refcount_set(&threads->refcnt, 1);
|
|
|
|
return threads;
|
|
}
|
|
|
|
struct perf_thread_map *perf_thread_map__new_dummy(void)
|
|
{
|
|
return perf_thread_map__new_array(1, NULL);
|
|
}
|
|
|
|
static void perf_thread_map__delete(struct perf_thread_map *threads)
|
|
{
|
|
if (threads) {
|
|
int i;
|
|
|
|
WARN_ONCE(refcount_read(&threads->refcnt) != 0,
|
|
"thread map refcnt unbalanced\n");
|
|
for (i = 0; i < threads->nr; i++)
|
|
free(perf_thread_map__comm(threads, i));
|
|
free(threads);
|
|
}
|
|
}
|
|
|
|
struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
|
|
{
|
|
if (map)
|
|
refcount_inc(&map->refcnt);
|
|
return map;
|
|
}
|
|
|
|
void perf_thread_map__put(struct perf_thread_map *map)
|
|
{
|
|
if (map && refcount_dec_and_test(&map->refcnt))
|
|
perf_thread_map__delete(map);
|
|
}
|
|
|
|
int perf_thread_map__nr(struct perf_thread_map *threads)
|
|
{
|
|
return threads ? threads->nr : 1;
|
|
}
|
|
|
|
pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx)
|
|
{
|
|
return map->map[idx].pid;
|
|
}
|