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Date: Mon, 2 Jul 2012 22:08:26 -0600
From: David Ahern <dsahern@...il.com>
To: linux-kernel@...r.kernel.org
Cc: David Ahern <dsahern@...il.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...il.com>,
Stephane Eranian <eranian@...gle.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH] perf tool: save cmdline from user in file header vs what is passed to record
A number of builtin commands process some user args and then pass the rest
to cmd_record. cmd_record then saves argc/argv that it receives into the
header of the perf data file. But this loses the arguments handled by the
first command -- ie., the real command line from the user. This patch saves
the command line as typed by the user rather than what was passed to
cmd_record.
As an example consider the command:
$ perf kvm --guest --host --guestmount=/tmp/guest-mount record
-fo /tmp/perf.data -ag -- sleep 10
Currently the command saved to the header is:
cmdline : /tmp/p3.5/perf record -o perf.data.kvm -fo /tmp/perf.data -ag -- sleep 1
(ignore the duplicated -o -- the first would be yet another bug with perf-kvm).
With this patch the command line saved to the header is:
cmdline : /tmp/p3.5/perf kvm --guest --host --guestmount=/tmp/guest-mount
record -fo /tmp/perf.data -ag -- sleep 1
Signed-off-by: David Ahern <dsahern@...il.com>
CC: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...il.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
---
tools/perf/builtin-kmem.c | 2 ++
tools/perf/builtin-kvm.c | 2 ++
tools/perf/builtin-lock.c | 2 ++
tools/perf/builtin-sched.c | 2 ++
tools/perf/builtin-script.c | 2 ++
tools/perf/builtin-timechart.c | 2 ++
tools/perf/util/header.c | 9 +++++++++
7 files changed, 21 insertions(+)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ce35015..08c8f74 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -770,6 +770,8 @@ static int __cmd_record(int argc, const char **argv)
int cmd_kmem(int argc, const char **argv, const char *prefix __used)
{
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, kmem_options, kmem_usage, 0);
if (!argc)
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 9fc6e0f..913d0a8 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -107,6 +107,8 @@ int cmd_kvm(int argc, const char **argv, const char *prefix __used)
perf_host = 0;
perf_guest = 1;
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, kvm_options, kvm_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index b3c4285..89917e1 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -980,6 +980,8 @@ int cmd_lock(int argc, const char **argv, const char *prefix __used)
for (i = 0; i < LOCKHASH_SIZE; i++)
INIT_LIST_HEAD(lockhash_table + i);
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, lock_options, lock_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7a9ad2b..25113b2 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1899,6 +1899,8 @@ static int __cmd_record(int argc, const char **argv)
int cmd_sched(int argc, const char **argv, const char *prefix __used)
{
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, sched_options, sched_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 1e60ab7..07bc60b 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1206,6 +1206,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __used)
setup_scripting();
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, options, script_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 3b75b2e..1e776a6 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -1108,6 +1108,8 @@ static const struct option options[] = {
int cmd_timechart(int argc, const char **argv, const char *prefix __used)
{
+ perf_header__set_cmdline(argc, argv);
+
argc = parse_options(argc, argv, options, timechart_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 5a47aba..99e410c 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -174,6 +174,15 @@ perf_header__set_cmdline(int argc, const char **argv)
{
int i;
+ /*
+ * If header_argv has already been set, do not override it.
+ * This allows a command to set the cmdline, parse args and
+ * then call another builtin function that implements a
+ * command -- e.g, cmd_kvm calling cmd_record.
+ */
+ if (header_argv)
+ return 0;
+
header_argc = (u32)argc;
/* do not include NULL termination */
--
1.7.10.1
--
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