1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
2 #ifndef __LIBPERF_BPF_PERF_H
3 #define __LIBPERF_BPF_PERF_H
5 #include <linux/types.h> /* for __u32 */
8 * bpf_perf uses a hashmap, the attr_map, to track all the leader programs.
9 * The hashmap is pinned in bpffs. flock() on this file is used to ensure
10 * no concurrent access to the attr_map. The key of attr_map is struct
11 * perf_event_attr, and the value is struct perf_event_attr_map_entry.
13 * struct perf_event_attr_map_entry contains two __u32 IDs, bpf_link of the
14 * leader prog, and the diff_map. Each perf-stat session holds a reference
15 * to the bpf_link to make sure the leader prog is attached to sched_switch
18 * Since the hashmap only contains IDs of the bpf_link and diff_map, it
19 * does not hold any references to the leader program. Once all perf-stat
20 * sessions of these events exit, the leader prog, its maps, and the
21 * perf_events will be freed.
23 struct perf_event_attr_map_entry {
28 /* default attr_map name */
29 #define BPF_PERF_DEFAULT_ATTR_MAP_PATH "perf_attr_map"
31 #endif /* __LIBPERF_BPF_PERF_H */