perf script: Add comm filtering option

Allows collecting events system wide and then pulling out events for a
specific task name(s). e.g,

    perf script -c gnome-shell,gnome-terminal

Applies on top of:
    https://lkml.org/lkml/2011/11/13/74

v2->v3
- update Documentation

v1->v2
- use comm_list from symbol_conf

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1321894972-24246-1-git-send-email-dsahern@gmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 17 insertions, 0 deletions

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index 3613b0a1aff2..7f61eaaf9ab8 100644
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -188,6 +188,11 @@ OPTIONS
         CPUs are specified with -: 0-2. Default is to report samples on all
         CPUs.
 
+-c::
+--comms=::
+        Only display events for these comms. CSV that understands
+        file://filename entries.
+
 -I::
 --show-info::
         Display extended information about the perf.data file. This adds
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 7731a09e975c..619d6dcaa1d9 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -441,6 +441,7 @@ static int process_sample_event(struct perf_tool *tool __used,
                                 struct perf_evsel *evsel,
                                 struct machine *machine)
 {
+        struct addr_location al;
         struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
 
         if (thread == NULL) {
@@ -460,6 +461,15 @@ static int process_sample_event(struct perf_tool *tool __used,
                 return 0;
         }
 
+        if (perf_event__preprocess_sample(event, machine, &al, sample, 0) < 0) {
+                pr_err("problem processing %d event, skipping it.\n",
+                       event->header.type);
+                return -1;
+        }
+
+        if (al.filtered)
+                return 0;
+
         if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
                 return 0;
 
@@ -1086,6 +1096,8 @@ static const struct option options[] = {
                      "comma separated output fields prepend with 'type:'. Valid types: hw,sw,trace,raw. Fields: comm,tid,pid,time,cpu,event,trace,ip,sym,dso,addr",
                      parse_output_fields),
         OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
+        OPT_STRING('c', "comms", &symbol_conf.comm_list_str, "comm[,comm...]",
+                   "only display events for these comms"),
         OPT_BOOLEAN('I', "show-info", &show_full_info,
                     "display extended information from perf.data file"),
         OPT_END()