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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>
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <perf/threadmap.h>
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#include <stdlib.h>
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#include <linux/refcount.h>
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#include <internal/threadmap.h>
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#include <string.h>
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#include <asm/bug.h>
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#include <stdio.h>
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static void perf_thread_map__reset(struct perf_thread_map *map, int start, int nr)
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{
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size_t size = (nr - start) * sizeof(map->map[0]);
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memset(&map->map[start], 0, size);
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map->err_thread = -1;
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}
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struct perf_thread_map *perf_thread_map__realloc(struct perf_thread_map *map, int nr)
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{
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size_t size = sizeof(*map) + sizeof(map->map[0]) * nr;
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int start = map ? map->nr : 0;
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map = realloc(map, size);
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/*
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* We only realloc to add more items, let's reset new items.
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*/
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if (map)
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perf_thread_map__reset(map, start, nr);
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return map;
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}
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#define thread_map__alloc(__nr) perf_thread_map__realloc(NULL, __nr)
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void perf_thread_map__set_pid(struct perf_thread_map *map, int idx, pid_t pid)
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{
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map->map[idx].pid = pid;
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}
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char *perf_thread_map__comm(struct perf_thread_map *map, int idx)
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{
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return map->map[idx].comm;
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}
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struct perf_thread_map *perf_thread_map__new_array(int nr_threads, pid_t *array)
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{
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struct perf_thread_map *threads = thread_map__alloc(nr_threads);
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int i;
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if (!threads)
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return NULL;
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for (i = 0; i < nr_threads; i++)
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perf_thread_map__set_pid(threads, i, array ? array[i] : -1);
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threads->nr = nr_threads;
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refcount_set(&threads->refcnt, 1);
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return threads;
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}
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struct perf_thread_map *perf_thread_map__new_dummy(void)
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{
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return perf_thread_map__new_array(1, NULL);
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}
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static void perf_thread_map__delete(struct perf_thread_map *threads)
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{
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if (threads) {
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int i;
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WARN_ONCE(refcount_read(&threads->refcnt) != 0,
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"thread map refcnt unbalanced\n");
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for (i = 0; i < threads->nr; i++)
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free(perf_thread_map__comm(threads, i));
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free(threads);
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}
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}
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struct perf_thread_map *perf_thread_map__get(struct perf_thread_map *map)
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{
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if (map)
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refcount_inc(&map->refcnt);
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return map;
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}
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void perf_thread_map__put(struct perf_thread_map *map)
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{
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if (map && refcount_dec_and_test(&map->refcnt))
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perf_thread_map__delete(map);
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}
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int perf_thread_map__nr(struct perf_thread_map *threads)
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{
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return threads ? threads->nr : 1;
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}
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pid_t perf_thread_map__pid(struct perf_thread_map *map, int idx)
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{
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return map->map[idx].pid;
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}
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