Commit 447ec4e5 authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
Browse files

perf lock: Introduce struct lock_contention 



The lock_contention struct is to carry related fields together and to
minimize the change when we add new config options.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Blake Jones <blakejones@google.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220802191004.347740-1-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 4ee3c4da

tools/perf/builtin-lock.c

+14 −9
Original line number Diff line number Diff line
@@ -1595,7 +1595,10 @@ static int __cmd_contention(int argc, const char **argv) 
		.mode  = PERF_DATA_MODE_READ,

		.force = force,

	};

	struct evlist *evlist = NULL;

	struct lock_contention con = {

		.target = &target,

		.result = &lockhash_table[0],

	};



	session = perf_session__new(use_bpf ? NULL : &data, &eops);

	if (IS_ERR(session)) {
@@ -1621,24 +1624,26 @@ static int __cmd_contention(int argc, const char **argv) 
		signal(SIGCHLD, sighandler);

		signal(SIGTERM, sighandler);



		evlist = evlist__new();

		if (evlist == NULL) {

		con.machine = &session->machines.host;



		con.evlist = evlist__new();

		if (con.evlist == NULL) {

			err = -ENOMEM;

			goto out_delete;

		}



		err = evlist__create_maps(evlist, &target);

		err = evlist__create_maps(con.evlist, &target);

		if (err < 0)

			goto out_delete;



		if (argc) {

			err = evlist__prepare_workload(evlist, &target,

			err = evlist__prepare_workload(con.evlist, &target,

						       argv, false, NULL);

			if (err < 0)

				goto out_delete;

		}



		if (lock_contention_prepare(evlist, &target) < 0) {

		if (lock_contention_prepare(&con) < 0) {

			pr_err("lock contention BPF setup failed\n");

			goto out_delete;

		}
@@ -1673,13 +1678,13 @@ static int __cmd_contention(int argc, const char **argv) 
	if (use_bpf) {

		lock_contention_start();

		if (argc)

			evlist__start_workload(evlist);

			evlist__start_workload(con.evlist);



		/* wait for signal */

		pause();



		lock_contention_stop();

		lock_contention_read(&session->machines.host, &lockhash_table[0]);

		lock_contention_read(&con);

	} else {

		err = perf_session__process_events(session);

		if (err)
@@ -1692,7 +1697,7 @@ static int __cmd_contention(int argc, const char **argv) 
	print_contention_result();



out_delete:

	evlist__delete(evlist);

	evlist__delete(con.evlist);

	lock_contention_finish();

	perf_session__delete(session);

	return err;

tools/perf/util/bpf_lock_contention.c

+6 −3
Original line number Diff line number Diff line
@@ -27,10 +27,12 @@ struct lock_contention_data { 
	u32 flags;

};



int lock_contention_prepare(struct evlist *evlist, struct target *target)

int lock_contention_prepare(struct lock_contention *con)

{

	int i, fd;

	int ncpus = 1, ntasks = 1;

	struct evlist *evlist = con->evlist;

	struct target *target = con->target;



	skel = lock_contention_bpf__open();

	if (!skel) {
@@ -102,12 +104,13 @@ int lock_contention_stop(void) 
	return 0;

}



int lock_contention_read(struct machine *machine, struct hlist_head *head)

int lock_contention_read(struct lock_contention *con)

{

	int fd, stack;

	u32 prev_key, key;

	struct lock_contention_data data;

	struct lock_stat *st;

	struct machine *machine = con->machine;

	u64 stack_trace[CONTENTION_STACK_DEPTH];



	fd = bpf_map__fd(skel->maps.lock_stat);
@@ -163,7 +166,7 @@ int lock_contention_read(struct machine *machine, struct hlist_head *head) 
			return -1;

		}



		hlist_add_head(&st->hash_entry, head);

		hlist_add_head(&st->hash_entry, con->result);

		prev_key = key;

	}

tools/perf/util/lock-contention.h

+11 −6
Original line number Diff line number Diff line
@@ -107,18 +107,24 @@ struct evlist; 
struct machine;

struct target;



struct lock_contention {

	struct evlist *evlist;

	struct target *target;

	struct machine *machine;

	struct hlist_head *result;

};



#ifdef HAVE_BPF_SKEL



int lock_contention_prepare(struct evlist *evlist, struct target *target);

int lock_contention_prepare(struct lock_contention *con);

int lock_contention_start(void);

int lock_contention_stop(void);

int lock_contention_read(struct machine *machine, struct hlist_head *head);

int lock_contention_read(struct lock_contention *con);

int lock_contention_finish(void);



#else  /* !HAVE_BPF_SKEL */



static inline int lock_contention_prepare(struct evlist *evlist __maybe_unused,

					  struct target *target __maybe_unused)

static inline int lock_contention_prepare(struct lock_contention *con __maybe_unused)

{

	return 0;

}
@@ -127,8 +133,7 @@ static inline int lock_contention_start(void) { return 0; } 
static inline int lock_contention_stop(void) { return 0; }

static inline int lock_contention_finish(void) { return 0; }



static inline int lock_contention_read(struct machine *machine __maybe_unused,

				       struct hlist_head *head __maybe_unused)

static inline int lock_contention_read(struct lock_contention *con __maybe_unused)

{

	return 0;

}