perf machine: Add machine__thread_exec_comm()

Add machine__thread_exec_comm() to return the comm that matches the last
exec, if the comm_exec flag is present, or the last comm otherwise.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1406786474-9306-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index ea3e09f..b093b93 100644 (file)
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -31,6 +31,7 @@ int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
 
        machine->symbol_filter = NULL;
        machine->id_hdr_size = 0;
+       machine->comm_exec = false;
 
        machine->root_dir = strdup(root_dir);
        if (machine->root_dir == NULL)
@@ -179,6 +180,19 @@ void machines__set_symbol_filter(struct machines *machines,
        }
 }
 
+void machines__set_comm_exec(struct machines *machines, bool comm_exec)
+{
+       struct rb_node *nd;
+
+       machines->host.comm_exec = comm_exec;
+
+       for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
+               struct machine *machine = rb_entry(nd, struct machine, rb_node);
+
+               machine->comm_exec = comm_exec;
+       }
+}
+
 struct machine *machines__find(struct machines *machines, pid_t pid)
 {
        struct rb_node **p = &machines->guests.rb_node;
@@ -398,6 +412,15 @@ struct thread *machine__find_thread(struct machine *machine, pid_t pid,
        return __machine__findnew_thread(machine, pid, tid, false);
 }
 
+struct comm *machine__thread_exec_comm(struct machine *machine,
+                                      struct thread *thread)
+{
+       if (machine->comm_exec)
+               return thread__exec_comm(thread);
+       else
+               return thread__comm(thread);
+}
+
 int machine__process_comm_event(struct machine *machine, union perf_event *event,
                                struct perf_sample *sample)
 {
@@ -406,6 +429,9 @@ int machine__process_comm_event(struct machine *machine, union perf_event *event
                                                        event->comm.tid);
        bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
 
+       if (exec)
+               machine->comm_exec = true;
+
        if (dump_trace)
                perf_event__fprintf_comm(event, stdout);
 

diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h
index b972824..61216e0 100644 (file)
--- a/tools/perf/util/machine.h
+++ b/tools/perf/util/machine.h
@@ -26,6 +26,7 @@ struct machine {
        struct rb_node    rb_node;
        pid_t             pid;
        u16               id_hdr_size;
+       bool              comm_exec;
        char              *root_dir;
        struct rb_root    threads;
        struct list_head  dead_threads;
@@ -47,6 +48,8 @@ struct map *machine__kernel_map(struct machine *machine, enum map_type type)
 
 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
                                    pid_t tid);
+struct comm *machine__thread_exec_comm(struct machine *machine,
+                                      struct thread *thread);
 
 int machine__process_comm_event(struct machine *machine, union perf_event *event,
                                struct perf_sample *sample);
@@ -88,6 +91,7 @@ char *machine__mmap_name(struct machine *machine, char *bf, size_t size);
 
 void machines__set_symbol_filter(struct machines *machines,
                                 symbol_filter_t symbol_filter);
+void machines__set_comm_exec(struct machines *machines, bool comm_exec);
 
 struct machine *machine__new_host(void);
 int machine__init(struct machine *machine, const char *root_dir, pid_t pid);

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 1b383bd..6d2d50d 100644 (file)
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -67,6 +67,25 @@ static void perf_session__destroy_kernel_maps(struct perf_session *session)
        machines__destroy_kernel_maps(&session->machines);
 }
 
+static bool perf_session__has_comm_exec(struct perf_session *session)
+{
+       struct perf_evsel *evsel;
+
+       evlist__for_each(session->evlist, evsel) {
+               if (evsel->attr.comm_exec)
+                       return true;
+       }
+
+       return false;
+}
+
+static void perf_session__set_comm_exec(struct perf_session *session)
+{
+       bool comm_exec = perf_session__has_comm_exec(session);
+
+       machines__set_comm_exec(&session->machines, comm_exec);
+}
+
 struct perf_session *perf_session__new(struct perf_data_file *file,
                                       bool repipe, struct perf_tool *tool)
 {
@@ -90,6 +109,7 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
                                goto out_close;
 
                        perf_session__set_id_hdr_size(session);
+                       perf_session__set_comm_exec(session);
                }
        }
 
@@ -866,8 +886,10 @@ static s64 perf_session__process_user_event(struct perf_session *session,
        switch (event->header.type) {
        case PERF_RECORD_HEADER_ATTR:
                err = tool->attr(tool, event, &session->evlist);
-               if (err == 0)
+               if (err == 0) {
                        perf_session__set_id_hdr_size(session);
+                       perf_session__set_comm_exec(session);
+               }
                return err;
        case PERF_RECORD_HEADER_EVENT_TYPE:
                /*