From: Adrian Hunter Date: Thu, 31 Jul 2014 06:00:44 +0000 (+0300) Subject: perf tools: Identify which comms are from exec X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=65de51f93ebf9305ec011da59c0b5fe29429d1b9;p=openwrt%2Fstaging%2Fblogic.git perf tools: Identify which comms are from exec For grouping together all the data from a single execution, which is needed for pairing calls and returns e.g. any outstanding calls when a process exec's will never return. Signed-off-by: Adrian Hunter Cc: David Ahern Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/r/1406786474-9306-2-git-send-email-adrian.hunter@intel.com [ Remove testing if comm->exec is false before setting it to true ] Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/comm.c b/tools/perf/util/comm.c index f9e777629e21..b2bb59df65e1 100644 --- a/tools/perf/util/comm.c +++ b/tools/perf/util/comm.c @@ -74,7 +74,7 @@ static struct comm_str *comm_str__findnew(const char *str, struct rb_root *root) return new; } -struct comm *comm__new(const char *str, u64 timestamp) +struct comm *comm__new(const char *str, u64 timestamp, bool exec) { struct comm *comm = zalloc(sizeof(*comm)); @@ -82,6 +82,7 @@ struct comm *comm__new(const char *str, u64 timestamp) return NULL; comm->start = timestamp; + comm->exec = exec; comm->comm_str = comm_str__findnew(str, &comm_str_root); if (!comm->comm_str) { @@ -94,7 +95,7 @@ struct comm *comm__new(const char *str, u64 timestamp) return comm; } -int comm__override(struct comm *comm, const char *str, u64 timestamp) +int comm__override(struct comm *comm, const char *str, u64 timestamp, bool exec) { struct comm_str *new, *old = comm->comm_str; @@ -106,6 +107,8 @@ int comm__override(struct comm *comm, const char *str, u64 timestamp) comm_str__put(old); comm->comm_str = new; comm->start = timestamp; + if (exec) + comm->exec = true; return 0; } diff --git a/tools/perf/util/comm.h b/tools/perf/util/comm.h index fac5bd51befc..51c10ab257f8 100644 --- a/tools/perf/util/comm.h +++ b/tools/perf/util/comm.h @@ -11,11 +11,13 @@ struct comm { struct comm_str *comm_str; u64 start; struct list_head list; + bool exec; }; void comm__free(struct comm *comm); -struct comm *comm__new(const char *str, u64 timestamp); +struct comm *comm__new(const char *str, u64 timestamp, bool exec); const char *comm__str(const struct comm *comm); -int comm__override(struct comm *comm, const char *str, u64 timestamp); +int comm__override(struct comm *comm, const char *str, u64 timestamp, + bool exec); #endif /* __PERF_COMM_H */ diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index 16bba9fff2c8..ea3e09f6a9c6 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -404,11 +404,13 @@ int machine__process_comm_event(struct machine *machine, union perf_event *event struct thread *thread = machine__findnew_thread(machine, event->comm.pid, event->comm.tid); + bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC; if (dump_trace) perf_event__fprintf_comm(event, stdout); - if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) { + if (thread == NULL || + __thread__set_comm(thread, event->comm.comm, sample->time, exec)) { dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n"); return -1; } diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c index 12c7a253a63c..a9df7f2c6dc9 100644 --- a/tools/perf/util/thread.c +++ b/tools/perf/util/thread.c @@ -42,7 +42,7 @@ struct thread *thread__new(pid_t pid, pid_t tid) goto err_thread; snprintf(comm_str, 32, ":%d", tid); - comm = comm__new(comm_str, 0); + comm = comm__new(comm_str, 0, false); free(comm_str); if (!comm) goto err_thread; @@ -81,19 +81,33 @@ struct comm *thread__comm(const struct thread *thread) return list_first_entry(&thread->comm_list, struct comm, list); } +struct comm *thread__exec_comm(const struct thread *thread) +{ + struct comm *comm, *last = NULL; + + list_for_each_entry(comm, &thread->comm_list, list) { + if (comm->exec) + return comm; + last = comm; + } + + return last; +} + /* CHECKME: time should always be 0 if event aren't ordered */ -int thread__set_comm(struct thread *thread, const char *str, u64 timestamp) +int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, + bool exec) { struct comm *new, *curr = thread__comm(thread); int err; /* Override latest entry if it had no specific time coverage */ - if (!curr->start) { - err = comm__override(curr, str, timestamp); + if (!curr->start && !curr->exec) { + err = comm__override(curr, str, timestamp, exec); if (err) return err; } else { - new = comm__new(str, timestamp); + new = comm__new(str, timestamp, exec); if (!new) return -ENOMEM; list_add(&new->list, &thread->comm_list); diff --git a/tools/perf/util/thread.h b/tools/perf/util/thread.h index 716b7723cce2..8c75fa774706 100644 --- a/tools/perf/util/thread.h +++ b/tools/perf/util/thread.h @@ -38,9 +38,17 @@ static inline void thread__exited(struct thread *thread) thread->dead = true; } -int thread__set_comm(struct thread *thread, const char *comm, u64 timestamp); +int __thread__set_comm(struct thread *thread, const char *comm, u64 timestamp, + bool exec); +static inline int thread__set_comm(struct thread *thread, const char *comm, + u64 timestamp) +{ + return __thread__set_comm(thread, comm, timestamp, false); +} + int thread__comm_len(struct thread *thread); struct comm *thread__comm(const struct thread *thread); +struct comm *thread__exec_comm(const struct thread *thread); const char *thread__comm_str(const struct thread *thread); void thread__insert_map(struct thread *thread, struct map *map); int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp);