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perf tool: Save cmdline from user in file header vs what is passed to record

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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

v2: simplified to saving the command in parse_options per Stephane's suggestion

Signed-off-by: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1343616831-6408-1-git-send-email-dsahern@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
David Ahern 2012-07-29 20:53:51 -06:00 committed by Arnaldo Carvalho de Melo
parent 1a31fc904f
commit 56e6f602aa
3 changed files with 12 additions and 2 deletions
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2
tools/perf/builtin-record.c
View File

@ -844,8 +844,6 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
struct perf_record *rec = &record;
char errbuf[BUFSIZ];
perf_header__set_cmdline(argc, argv);
evsel_list = perf_evlist__new(NULL, NULL);
if (evsel_list == NULL)
return -ENOMEM;

9
tools/perf/util/header.c
View File

@ -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 */

3
tools/perf/util/parse-options.c
View File

@ -1,6 +1,7 @@
#include "util.h"
#include "parse-options.h"
#include "cache.h"
#include "header.h"
#define OPT_SHORT 1
#define OPT_UNSET 2
@ -413,6 +414,8 @@ int parse_options(int argc, const char **argv, const struct option *options,
{
struct parse_opt_ctx_t ctx;
perf_header__set_cmdline(argc, argv);
parse_options_start(&ctx, argc, argv, flags);
switch (parse_options_step(&ctx, options, usagestr)) {
case PARSE_OPT_HELP: