linux-kernel - [PATCH v2 6/6] perf report: Add option to specify time window of interest

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Date:   Tue, 29 Nov 2016 10:15:46 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     acme@...nel.org
Cc:     mingo@...nel.org, peterz@...radead.org, namhyung@...nel.org,
        jolsa@...nel.org, linux-kernel@...r.kernel.org,
        David Ahern <dsahern@...il.com>
Subject: [PATCH v2 6/6] perf report: Add option to specify time window of interest

Add option to allow user to control analysis window. e.g., collect data
for time window and analyze a segment of interest within that window.

Signed-off-by: David Ahern <dsahern@...il.com>
---
 tools/perf/Documentation/perf-report.txt |  7 +++++++
 tools/perf/builtin-report.c              | 14 +++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 2d1746295abf..3a166ae4a4d3 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -382,6 +382,13 @@ OPTIONS
 --header-only::
 	Show only perf.data header (forces --stdio).
 
+--time::
+	Only analyze samples within given time window: <start>,<stop>. Times
+	have the format seconds.microseconds. If start is not given (i.e., time
+	string is ',x.y') then analysis starts at the beginning of the file. If
+	stop time is not given (i.e, time string is 'x.y,') then analysis goes
+	to end of file.
+
 --itrace::
 	Options for decoding instruction tracing data. The options are:
 
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 3dfbfffe2ecd..d2afbe4a240d 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -36,7 +36,7 @@
 #include "util/hist.h"
 #include "util/data.h"
 #include "arch/common.h"
-
+#include "util/time-utils.h"
 #include "util/auxtrace.h"
 
 #include <dlfcn.h>
@@ -59,6 +59,8 @@ struct report {
 	const char		*pretty_printing_style;
 	const char		*cpu_list;
 	const char		*symbol_filter_str;
+	const char		*time_str;
+	struct perf_time_interval ptime;
 	float			min_percent;
 	u64			nr_entries;
 	u64			queue_size;
@@ -158,6 +160,9 @@ static int process_sample_event(struct perf_tool *tool,
 	};
 	int ret = 0;
 
+	if (perf_time__skip_sample(&rep->ptime, sample->time))
+		return 0;
+
 	if (machine__resolve(machine, &al, sample) < 0) {
 		pr_debug("problem processing %d event, skipping it.\n",
 			 event->header.type);
@@ -830,6 +835,8 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 	OPT_CALLBACK_DEFAULT(0, "stdio-color", NULL, "mode",
 			     "'always' (default), 'never' or 'auto' only applicable to --stdio mode",
 			     stdio__config_color, "always"),
+	OPT_STRING(0, "time", &report.time_str, "str",
+		   "Time span of interest (start,stop)"),
 	OPT_END()
 	};
 	struct perf_data_file file = {
@@ -1015,6 +1022,11 @@ int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
 	if (symbol__init(&session->header.env) < 0)
 		goto error;
 
+	if (perf_time__parse_str(&report.ptime, report.time_str) != 0) {
+		pr_err("Invalid time string\n");
+		return -EINVAL;
+	}
+
 	sort__setup_elide(stdout);
 
 	ret = __cmd_report(&report);
-- 
2.7.4 (Apple Git-66)