linux-kernel - [PATCH V3 5/6] perf auxtrace: Add itrace d+o option to direct debug log to stdout

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Message-Id: <20211027080334.365596-6-adrian.hunter@intel.com>
Date:   Wed, 27 Oct 2021 11:03:33 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Andi Kleen <ak@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH V3 5/6] perf auxtrace: Add itrace d+o option to direct debug log to stdout

It can be useful to see debug output in between normal output.

Add 'o' to the flags of debug option 'd', so that '--itrace=d+o' can
specify output of the debug log to stdout.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/Documentation/itrace.txt | 1 +
 tools/perf/util/auxtrace.h          | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt
index 141449e97bed..c52755481e2f 100644
--- a/tools/perf/Documentation/itrace.txt
+++ b/tools/perf/Documentation/itrace.txt
@@ -62,5 +62,6 @@
 	debug messages will or will not be logged. Each flag must be preceded
 	by either '+' or '-'. The flags are:
 		a	all perf events
+		o	output to stdout
 
 	If supported, the 'q' option may be repeated to increase the effect.
diff --git a/tools/perf/util/auxtrace.h b/tools/perf/util/auxtrace.h
index 889f976ea1a0..bbf0d78c6401 100644
--- a/tools/perf/util/auxtrace.h
+++ b/tools/perf/util/auxtrace.h
@@ -59,6 +59,7 @@ enum itrace_period_type {
 #define AUXTRACE_ERR_FLG_DATA_LOST	(1 << ('l' - 'a'))
 
 #define AUXTRACE_LOG_FLG_ALL_PERF_EVTS	(1 << ('a' - 'a'))
+#define AUXTRACE_LOG_FLG_USE_STDOUT	(1 << ('o' - 'a'))
 
 /**
  * struct itrace_synth_opts - AUX area tracing synthesis options.
@@ -641,6 +642,7 @@ bool auxtrace__evsel_is_auxtrace(struct perf_session *session,
 "				d[flags]:		create a debug log\n" \
 "							each flag must be preceded by + or -\n" \
 "							log flags are: a (all perf events)\n" \
+"							               o (output to stdout)\n" \
 "				f:	    		synthesize first level cache events\n" \
 "				m:	    		synthesize last level cache events\n" \
 "				t:	    		synthesize TLB events\n" \
-- 
2.25.1