linux-kernel - [PATCH 08/14] perf tools: show side-band events overhead

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Date:   Wed, 23 Nov 2016 04:44:46 -0500
From:   kan.liang@...el.com
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, tglx@...utronix.de,
        namhyung@...nel.org, jolsa@...nel.org, adrian.hunter@...el.com,
        wangnan0@...wei.com, mark.rutland@....com, andi@...stfloor.org,
        Kan Liang <kan.liang@...el.com>
Subject: [PATCH 08/14] perf tools: show side-band events overhead

From: Kan Liang <kan.liang@...el.com>

Caculate the total overhead from accessing side-band events handler
function, and display them in perf report

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 tools/perf/builtin-report.c | 3 +++
 tools/perf/util/event.h     | 5 +++++
 tools/perf/util/machine.c   | 5 +++++
 tools/perf/util/session.c   | 4 ++++
 4 files changed, 17 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2515d7a..9c0a424 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -384,6 +384,9 @@ static int perf_evlist__tty_browse_hists(struct perf_evlist *evlist,
 			fprintf(stdout, "#\t\tMultiplexing#: %" PRIu64 " time: %" PRIu64 " ns\n",
 				evlist->stats.total_mux_overhead[cpu][0],
 				evlist->stats.total_mux_overhead[cpu][1]);
+			fprintf(stdout, "#\t\tSB#: %" PRIu64 " time: %" PRIu64 " ns\n",
+				evlist->stats.total_sb_overhead[cpu][0],
+				evlist->stats.total_sb_overhead[cpu][1]);
 		}
 		fprintf(stdout, "#\n");
 	}
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 70e2508..3357529 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -267,6 +267,10 @@ enum auxtrace_error_type {
  * The total NMI# is stored in [0], while the accumulated time is in [1].
  * The total_mux_overhead tells exactly the Multiplexing overhead on each CPU.
  * The total rotate# is stored in [0], while the accumulated time is in [1].
+ * The total_sb_overhead tells exactly the overhead to output side-band
+ * events on each CPU.
+ * The total number of accessing side-band events handler function is stored
+ * in [0], while the accumulated processing time is in [1].
  */
 struct events_stats {
 	u64 total_period;
@@ -277,6 +281,7 @@ struct events_stats {
 	u64 total_invalid_chains;
 	u64 total_nmi_overhead[MAX_NR_CPUS][2];
 	u64 total_mux_overhead[MAX_NR_CPUS][2];
+	u64 total_sb_overhead[MAX_NR_CPUS][2];
 	u32 nr_events[PERF_RECORD_HEADER_MAX];
 	u32 nr_non_filtered_samples;
 	u32 nr_lost_warned;
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index eca1f8b..d8cde21 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -568,6 +568,11 @@ int machine__process_overhead_event(struct machine *machine __maybe_unused,
 			    event->overhead.entry.nr,
 			    event->overhead.entry.time,
 			    event->overhead.entry.cpu);
+	} else if (event->overhead.type == PERF_SB_OVERHEAD) {
+		dump_printf(" SB nr: %llu  time: %llu cpu %u\n",
+			    event->overhead.entry.nr,
+			    event->overhead.entry.time,
+			    event->overhead.entry.cpu);
 	} else {
 		dump_printf("\tUNSUPPORT OVERHEAD TYPE 0x%x!\n", event->overhead.type);
 	}
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 594fd5e..e3aa9d7 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1222,6 +1222,10 @@ overhead_stats_update(struct perf_tool *tool,
 			evlist->stats.total_mux_overhead[event->overhead.entry.cpu][0] += event->overhead.entry.nr;
 			evlist->stats.total_mux_overhead[event->overhead.entry.cpu][1] += event->overhead.entry.time;
 			break;
+		case PERF_SB_OVERHEAD:
+			evlist->stats.total_sb_overhead[event->overhead.entry.cpu][0] += event->overhead.entry.nr;
+			evlist->stats.total_sb_overhead[event->overhead.entry.cpu][1] += event->overhead.entry.time;
+			break;
 		default:
 			break;
 		}
-- 
2.5.5