linux-kernel - [PATCH] perf report: Create option to disable raw event ordering

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Date:   Fri, 19 Feb 2021 15:00:05 +0800
From:   Jin Yao <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH] perf report: Create option to disable raw event ordering

Warning "dso not found" is reported when using "perf report -D".

 66702781413407 0x32c0 [0x30]: PERF_RECORD_SAMPLE(IP, 0x2): 28177/28177: 0x55e493e00563 period: 106578 addr: 0
  ... thread: perf:28177
  ...... dso: <not found>

 66702727832429 0x9dd8 [0x38]: PERF_RECORD_COMM exec: triad_loop:28177/28177

The PERF_RECORD_SAMPLE event (timestamp: 66702781413407) should be after the
PERF_RECORD_COMM event (timestamp: 66702727832429), but it's early processed.

So for most of cases, it makes sense to keep the event ordered even for dump
mode. But it would be also useful to disable ordered_events for reporting raw
dump to see events as they are stored in the perf.data file.

So now, set ordered_events by default to true and add a new option
'disable-order' to disable it. For example,

perf report -D --disable-order

Fixes: 977f739b7126b ("perf report: Disable ordered_events for raw dump")
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
 tools/perf/Documentation/perf-report.txt | 3 +++
 tools/perf/builtin-report.c              | 5 ++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index f546b5e9db05..87112e8d904e 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -224,6 +224,9 @@ OPTIONS
 --dump-raw-trace::
         Dump raw trace in ASCII.
 
+--disable-order::
+	Disable raw trace ordering.
+
 -g::
 --call-graph=<print_type,threshold[,print_limit],order,sort_key[,branch],value>::
         Display call chains using type, min percent threshold, print limit,
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 2a845d6cac09..0d65c98794a8 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -84,6 +84,7 @@ struct report {
 	bool			nonany_branch_mode;
 	bool			group_set;
 	bool			stitch_lbr;
+	bool			disable_order;
 	int			max_stack;
 	struct perf_read_values	show_threads_values;
 	struct annotation_options annotation_opts;
@@ -1296,6 +1297,8 @@ int cmd_report(int argc, const char **argv)
 	OPTS_EVSWITCH(&report.evswitch),
 	OPT_BOOLEAN(0, "total-cycles", &report.total_cycles_mode,
 		    "Sort all blocks by 'Sampled Cycles%'"),
+	OPT_BOOLEAN(0, "disable-order", &report.disable_order,
+		    "Disable raw trace ordering"),
 	OPT_END()
 	};
 	struct perf_data data = {
@@ -1329,7 +1332,7 @@ int cmd_report(int argc, const char **argv)
 	if (report.mmaps_mode)
 		report.tasks_mode = true;
 
-	if (dump_trace)
+	if (dump_trace && report.disable_order)
 		report.tool.ordered_events = false;
 
 	if (quiet)
-- 
2.17.1