linux-kernel - [tip:perf/core] perf record: Add new -I option to sample interrupted machine state

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Message-ID: <tip-4b6c51773d86883a2e80cffadbe4f178ac1babd8@git.kernel.org>
Date:	Sun, 16 Nov 2014 04:36:46 -0800
From:	tip-bot for Stephane Eranian <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...nel.org, hpa@...or.com, mingo@...nel.org,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	khandual@...ux.vnet.ibm.com, adrian.hunter@...el.com,
	eranian@...gle.com, peterz@...radead.org, standby24x7@...il.com,
	linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf record:
  Add new -I option to sample interrupted machine state

Commit-ID:  4b6c51773d86883a2e80cffadbe4f178ac1babd8
Gitweb:     http://git.kernel.org/tip/4b6c51773d86883a2e80cffadbe4f178ac1babd8
Author:     Stephane Eranian <eranian@...gle.com>
AuthorDate: Wed, 24 Sep 2014 13:48:41 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Sun, 16 Nov 2014 11:42:02 +0100

perf record: Add new -I option to sample interrupted machine state

Add -I/--intr-regs option to capture machine state registers at
interrupt.

Add the corresponding man page description

Signed-off-by: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1411559322-16548-6-git-send-email-eranian@google.com
Cc: cebbert.lkml@...il.com
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Anshuman Khandual <khandual@...ux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Masanari Iida <standby24x7@...il.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 tools/perf/Documentation/perf-record.txt | 6 ++++++
 tools/perf/builtin-record.c              | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 398f8d5..af9a54e 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -214,6 +214,12 @@ if combined with -a or -C options.
 After starting the program, wait msecs before measuring. This is useful to
 filter out the startup phase of the program, which is often very different.
 
+-I::
+--intr-regs::
+Capture machine state (registers) at interrupt, i.e., on counter overflows for
+each sample. List of captured registers depends on the architecture. This option
+is off by default.
+
 SEE ALSO
 --------
 linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 582c4da..8648c6d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -811,6 +811,8 @@ struct option __record_options[] = {
 		    "sample transaction flags (special events only)"),
 	OPT_BOOLEAN(0, "per-thread", &record.opts.target.per_thread,
 		    "use per-thread mmaps"),
+	OPT_BOOLEAN('I', "intr-regs", &record.opts.sample_intr_regs,
+		    "Sample machine registers on interrupt"),
 	OPT_END()
 };
 
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