Adding cpu count dimension key wrapper.

It is to be displayed in the single cacheline output:

  cpucnt

It displays number of distinct cpus that hit cacheline.

Link: http://lkml.kernel.org/n/tip-ib2kdwam52fby9u2k3ij6...@git.kernel.org
Signed-off-by: Jiri Olsa <jo...@kernel.org>
---
 tools/perf/builtin-c2c.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 5d42f7912450..2318249362f8 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -1012,6 +1012,20 @@ MEAN_ENTRY(mean_rmt_entry,  rmt_hitm);
 MEAN_ENTRY(mean_lcl_entry,  lcl_hitm);
 MEAN_ENTRY(mean_load_entry, load);
 
+static int
+cpucnt_entry(struct perf_hpp_fmt *fmt __maybe_unused, struct perf_hpp *hpp,
+            struct hist_entry *he)
+{
+       struct c2c_hist_entry *c2c_he;
+       int width = c2c_width(fmt, hpp, he->hists);
+       char buf[10];
+
+       c2c_he = container_of(he, struct c2c_hist_entry, he);
+
+       snprintf(buf, 10, "%d", bitmap_weight(c2c_he->cpuset, c2c.cpus_cnt));
+       return snprintf(hpp->buf, hpp->size, "%*s", width, buf);
+}
+
 #define HEADER_LOW(__h)                        \
        {                               \
                .line[1] = {            \
@@ -1338,6 +1352,14 @@ static struct c2c_dimension dim_mean_load = {
        .width          = 8,
 };
 
+static struct c2c_dimension dim_cpucnt = {
+       .header         = HEADER_BOTH("cpu", "cnt"),
+       .name           = "cpucnt",
+       .cmp            = empty_cmp,
+       .entry          = cpucnt_entry,
+       .width          = 8,
+};
+
 static struct c2c_dimension *dimensions[] = {
        &dim_dcacheline,
        &dim_offset,
@@ -1375,6 +1397,7 @@ static struct c2c_dimension *dimensions[] = {
        &dim_mean_rmt,
        &dim_mean_lcl,
        &dim_mean_load,
+       &dim_cpucnt,
        NULL,
 };
 
-- 
2.7.4

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