linux-kernel - [PATCH 4/7] perf trace: add pagefault statistics

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Message-Id: <1403261389-13423-5-git-send-email-stfomichev@yandex-team.ru>
Date:	Fri, 20 Jun 2014 14:49:46 +0400
From:	Stanislav Fomichev <stfomichev@...dex-team.ru>
To:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, dsahern@...il.com, stfomichev@...dex-team.ru,
	jolsa@...hat.com, xiaoguangrong@...ux.vnet.ibm.com,
	yangds.fnst@...fujitsu.com, adrian.hunter@...el.com,
	namhyung@...nel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] perf trace: add pagefault statistics

'perf trace' can show summary of events using -S option. This commit
also reports number of major/minor pagefault events in this summary.

Signed-off-by: Stanislav Fomichev <stfomichev@...dex-team.ru>
---
 tools/perf/builtin-trace.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 9d3f3f7f3ea1..9dd21dd26ef2 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -1132,6 +1132,7 @@ struct thread_trace {
 	u64		  exit_time;
 	bool		  entry_pending;
 	unsigned long	  nr_events;
+	unsigned long	  pfmaj, pfmin;
 	char		  *entry_str;
 	double		  runtime_ms;
 	struct {
@@ -1786,8 +1787,12 @@ static int trace__pgfault(struct trace *trace,
 	u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
 	struct addr_location al;
 	char map_type = 'd';
+	struct thread_trace *ttrace;
 
 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
+	ttrace = thread__trace(thread, trace->output);
+	if (ttrace == NULL)
+		return -1;
 
 	thread__find_addr_location(thread, trace->host, cpumode, MAP__FUNCTION,
 			      sample->ip, &al);
@@ -1798,6 +1803,11 @@ static int trace__pgfault(struct trace *trace,
 		evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?
 		"maj" : "min");
 
+	if (evsel->attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)
+		ttrace->pfmaj++;
+	else
+		ttrace->pfmin++;
+
 	if (al.sym)
 		fprintf(trace->output, "[%s+0x%lx]",
 			al.sym->name, al.addr - al.sym->start);
@@ -2338,6 +2348,7 @@ static int trace__fprintf_one_thread(struct thread *thread, void *priv)
 	printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread->tid);
 	printed += fprintf(fp, "%lu events, ", ttrace->nr_events);
 	printed += fprintf(fp, "%.1f%%", ratio);
+	printed += fprintf(fp, ", %lu:%lu faults", ttrace->pfmaj, ttrace->pfmin);
 	printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);
 	printed += thread__dump_stats(ttrace, trace, fp);
 
-- 
1.8.3.2

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