perf/util/bpf_counter.c

370 	if (evsel->core.leader->nr_members > 1) {  in bperf_check_target()
406 		pr_err("Failed to open leader skeleton\n");  in bperf_reload_leader_program()
413 		pr_err("Failed to load leader skeleton\n");  in bperf_reload_leader_program()
419 		pr_err("Failed to attach leader program\n");  in bperf_reload_leader_program()
467 	 * Step 1: hold a fd on the leader program and the bpf_link, if  in bperf__load()
492 	 * The bpf_link holds reference to the leader program, and the  in bperf__load()
493 	 * leader program holds reference to the maps. Therefore, if  in bperf__load()
522 	/* attach fexit program to the leader program */  in bperf__load()
526 	/* connect to leader diff_reading map */  in bperf__load()
586  * trigger the leader prog on each cpu, so the accum_reading map could get
713  * cs -> | leader prog |/         ||/        |         |
733  * The leader prog is triggered on each context switch (cs). The leader
736  * multiple perf-stat sessions share the same leader prog.
739  * leader prog. It is possible to attach up to BPF_MAX_TRAMP_PROGS (38)
740  * follower progs to the same leader prog. The follower prog checks current
746  * Besides context switch, it is also necessary to trigger the leader prog
753  * the leader prog.