[PATCH 39/52] perf c2c report: Add shared cachelines stats stdio output

Arnaldo Carvalho de Melo
2016-10-20T15:09:59Z

Display global shared cachelines related stats table as part of the
stdio output or when --stats option is speicified:

$ perf c2c report --stats
...
=================================================
Global Shared Cache Line Event Information
=================================================
Total Shared Cache Lines : 1384
Load HITs on shared lines : 5995
Fill Buffer Hits on shared lines : 1726
L1D hits on shared lines : 1943
L2D hits on shared lines : 0
LLC hits on shared lines : 1360
Locked Access on shared lines : 1993
Store HITs on shared lines : 1504
Store L1D hits on shared lines : 1446
Total Merged records : 3527

Original-patch-by: Dick Fowles <rfowles@redhat.com>
Original-patch-by: Don Zickus <dzickus@redhat.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/n/tip-p0gty8ctbdzisrniwqxhqmhq@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-c2c.c | 62 +++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 61 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index d365902acf61..7bbb969f284a 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -56,6 +56,10 @@ struct perf_c2c {
bool show_src;
bool use_stdio;
bool stats_only;
+
+ /* HITM shared clines stats */
+ struct c2c_stats hitm_stats;
+ int shared_clines;
};

static struct perf_c2c c2c;
@@ -1732,6 +1736,39 @@ static int setup_nodes(struct perf_session *session)
return 0;
}

+#define HAS_HITMS(__h) ((__h)->stats.lcl_hitm || (__h)->stats.rmt_hitm)
+
+static int resort_hitm_cb(struct hist_entry *he)
+{
+ struct c2c_hist_entry *c2c_he;
+ c2c_he = container_of(he, struct c2c_hist_entry, he);
+
+ if (HAS_HITMS(c2c_he)) {
+ c2c.shared_clines++;
+ c2c_add_stats(&c2c.hitm_stats, &c2c_he->stats);
+ }
+
+ return 0;
+}
+
+static int hists__iterate_cb(struct hists *hists, hists__resort_cb_t cb)
+{
+ struct rb_node *next = rb_first(&hists->entries);
+ int ret = 0;
+
+ while (next) {
+ struct hist_entry *he;
+
+ he = rb_entry(next, struct hist_entry, rb_node);
+ ret = cb(he);
+ if (ret)
+ break;
+ next = rb_next(&he->rb_node);
+ }
+
+ return ret;
+}
+
static void print_c2c__display_stats(FILE *out)
{
int llc_misses;
@@ -1777,6 +1814,26 @@ static void print_c2c__display_stats(FILE *out)
fprintf(out, " Unable to parse data source : %10d\n", stats->noparse);
}

+static void print_shared_cacheline_info(FILE *out)
+{
+ struct c2c_stats *stats = &c2c.hitm_stats;
+ int hitm_cnt = stats->lcl_hitm + stats->rmt_hitm;
+
+ fprintf(out, "=================================================\n");
+ fprintf(out, " Global Shared Cache Line Event Information \n");
+ fprintf(out, "=================================================\n");
+ fprintf(out, " Total Shared Cache Lines : %10d\n", c2c.shared_clines);
+ fprintf(out, " Load HITs on shared lines : %10d\n", stats->load);
+ fprintf(out, " Fill Buffer Hits on shared lines : %10d\n", stats->ld_fbhit);
+ fprintf(out, " L1D hits on shared lines : %10d\n", stats->ld_l1hit);
+ fprintf(out, " L2D hits on shared lines : %10d\n", stats->ld_l2hit);
+ fprintf(out, " LLC hits on shared lines : %10d\n", stats->ld_llchit + stats->lcl_hitm);
+ fprintf(out, " Locked Access on shared lines : %10d\n", stats->locks);
+ fprintf(out, " Store HITs on shared lines : %10d\n", stats->store);
+ fprintf(out, " Store L1D hits on shared lines : %10d\n", stats->st_l1hit);
+ fprintf(out, " Total Merged records : %10d\n", hitm_cnt + stats->store);
+}
+
static void print_cacheline(struct c2c_hists *c2c_hists,
struct hist_entry *he_cl,
struct perf_hpp_list *hpp_list,
@@ -1841,6 +1898,8 @@ static void perf_c2c__hists_fprintf(FILE *out)
setup_pager();

print_c2c__display_stats(out);
+ fprintf(out, "\n");
+ print_shared_cacheline_info(out);

if (c2c.stats_only)
return;
@@ -2131,7 +2190,8 @@ static int perf_c2c__report(int argc, const char **argv)
ui_progress__init(&prog, c2c.hists.hists.nr_entries, "Sorting...");

hists__collapse_resort(&c2c.hists.hists, NULL);
- hists__output_resort_cb(&c2c.hists.hists, &prog, resort_cl_cb);
+ hists__output_resort_cb(&c2c.hists.hists, &prog, resort_hitm_cb);
+ hists__iterate_cb(&c2c.hists.hists, resort_cl_cb);

ui_progress__finish();

--
2.7.4