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From: Masami Hiramatsu <mhiramat@kernel.org>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: linux-kernel@vger.kernel.org,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	linux-perf-users@vger.kernel.org
Subject: [PATCH 3/3] perf/probe: docs: Add --bootconfig option to perf-probe manual
Date: Sat, 19 Jun 2021 01:11:08 +0900	[thread overview]
Message-ID: <162403266812.528888.12101980553259365416.stgit@devnote2> (raw)
In-Reply-To: <162403264218.528888.2914545241015551186.stgit@devnote2>

Add --bootconfig option and example to the perf-probe manual.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 tools/perf/Documentation/perf-probe.txt |   15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-probe.txt b/tools/perf/Documentation/perf-probe.txt
index ed3ecfa422e1..d0908170c3d2 100644
--- a/tools/perf/Documentation/perf-probe.txt
+++ b/tools/perf/Documentation/perf-probe.txt
@@ -103,7 +103,14 @@ OPTIONS
 -D::
 --definition=::
 	Show trace-event definition converted from given probe-event instead
-	of write it into tracing/[k,u]probe_events.
+	of write it into tracing/[k,u]probe_events. This accepts --bootconfig
+	option.
+
+--bootconfig::
+	Show the trace-event definition in Extra Boot Configuration (bootconfig)
+	syntax. This helps users to write the probe event definitions for the
+	boot-time tracing.
+	Note that this must be used with --definition(-D) option.
 
 --filter=FILTER::
 	(Only for --vars and --funcs) Set filter. FILTER is a combination of glob
@@ -294,6 +301,12 @@ Add a probe in a source file using special characters by backslash escape
 
  ./perf probe -x /opt/test/a.out 'foo\+bar.c:4'
 
+Define a kprobe event on the line 7 of path_lookup for the boot-time tracing
+and set it to the initrd.img.
+
+ ./perf probe -k /boot/vmlinux --bootconfig -D "path_lookup:7" > tmp.bconf
+ bootconfig -a tmp.bconf /boot/initrd.img
+
 
 SEE ALSO
 --------


  parent reply	other threads:[~2021-06-18 16:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-04 16:28 [PATCH 0/3] perf probe: Boot time tracing support Masami Hiramatsu
2021-06-04 16:28 ` [PATCH 1/3] perf/probe: Support probes on init functions for offline kernel Masami Hiramatsu
2021-06-04 16:28 ` [PATCH 2/3] perf/probe: Cleanup synthesize_probe_trace_command Masami Hiramatsu
2021-06-04 16:28 ` [PATCH 3/3] perf/probe: Add --bootconfig to output definition in bootconfig format Masami Hiramatsu
2021-06-18 13:14   ` Arnaldo Carvalho de Melo
2021-06-18 15:07     ` Masami Hiramatsu
2021-06-18 16:10     ` [PATCH 0/3] perf probe: Boot time tracing support followup Masami Hiramatsu
2021-06-18 16:10       ` [PATCH 1/3] [v2] perf/probe: Add --bootconfig to output definition in bootconfig format Masami Hiramatsu
2021-06-18 16:11       ` [PATCH 2/3] perf/probe: Show return probe correctly with --bootconfig Masami Hiramatsu
2021-06-18 16:11       ` Masami Hiramatsu [this message]
2021-06-18 15:55   ` [PATCH 3/3] perf/probe: Add --bootconfig to output definition in bootconfig format Masami Hiramatsu

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