perf sched map: Display only given cpus

Introducing --cpus option that will display only given cpus. Could be
used together with color-cpus option.

  $ perf sched map  --cpus 0,1
        *A0   309999.786924 secs A0 => rcu_sched:7
        *.    309999.786930 secs
    *B0  .    309999.786931 secs B0 => rcuos/2:25
     B0 *A0   309999.786947 secs

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1460467771-26532-9-git-send-email-jolsa@kernel.org
[ Added entry to man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt
index 58bff6cbc3f3..1cc08cc47ac5 100644
--- a/tools/perf/Documentation/perf-sched.txt
+++ b/tools/perf/Documentation/perf-sched.txt
@@ -57,6 +57,9 @@ OPTIONS for 'perf sched map'
         Show only CPUs with activity. Helps visualizing on high core
         count systems.
 
+--cpus::
+        Show just entries with activities for the given CPUs.
+
 --color-cpus::
         Highlight the given cpus.
 
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7de04b297c14..afa057666c2a 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -135,6 +135,8 @@ struct perf_sched_map {
         const char              *color_pids_str;
         struct cpu_map          *color_cpus;
         const char              *color_cpus_str;
+        struct cpu_map          *cpus;
+        const char              *cpus_str;
 };
 
 struct perf_sched {
@@ -1469,6 +1471,9 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
                 if (curr_thread && thread__has_color(curr_thread))
                         pid_color = COLOR_PIDS;
 
+                if (sched->map.cpus && !cpu_map__has(sched->map.cpus, cpu))
+                        continue;
+
                 if (sched->map.color_cpus && cpu_map__has(sched->map.color_cpus, cpu))
                         cpu_color = COLOR_CPUS;
 
@@ -1483,6 +1488,9 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
                         color_fprintf(stdout, color, "   ");
         }
 
+        if (sched->map.cpus && !cpu_map__has(sched->map.cpus, this_cpu))
+                goto out;
+
         color_fprintf(stdout, color, "  %12.6f secs ", (double)timestamp/1e9);
         if (new_shortname) {
                 const char *pid_color = color;
@@ -1497,6 +1505,7 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
         if (sched->map.comp && new_cpu)
                 color_fprintf(stdout, color, " (CPU %d)", this_cpu);
 
+out:
         color_fprintf(stdout, color, "\n");
 
         thread__put(sched_in);
@@ -1756,6 +1765,8 @@ static int perf_sched__lat(struct perf_sched *sched)
 
 static int setup_map_cpus(struct perf_sched *sched)
 {
+        struct cpu_map *map;
+
         sched->max_cpu  = sysconf(_SC_NPROCESSORS_CONF);
 
         if (sched->map.comp) {
@@ -1764,6 +1775,16 @@ static int setup_map_cpus(struct perf_sched *sched)
                         return -1;
         }
 
+        if (!sched->map.cpus_str)
+                return 0;
+
+        map = cpu_map__new(sched->map.cpus_str);
+        if (!map) {
+                pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
+                return -1;
+        }
+
+        sched->map.cpus = map;
         return 0;
 }
 
@@ -1971,6 +1992,8 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
                    "highlight given pids in map"),
         OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
                     "highlight given CPUs in map"),
+        OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
+                    "display given CPUs in map"),
         OPT_END()
         };
         const char * const latency_usage[] = {