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: Namhyung 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: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index 2a09f36..4bc521a 100644 (file)
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -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;

diff --git a/tools/perf/util/bpf_lock_contention.c b/tools/perf/util/bpf_lock_contention.c
index 16b7451..f5e2b4f 100644 (file)
--- a/tools/perf/util/bpf_lock_contention.c
+++ b/tools/perf/util/bpf_lock_contention.c
@@ -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;
        }
 

diff --git a/tools/perf/util/lock-contention.h b/tools/perf/util/lock-contention.h
index 092c844..a0df530 100644 (file)
--- a/tools/perf/util/lock-contention.h
+++ b/tools/perf/util/lock-contention.h
@@ -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;
 }