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authorArnaldo Carvalho de Melo <acme@redhat.com>2009-12-27 21:36:57 -0200
committerIngo Molnar <mingo@elte.hu>2009-12-28 09:02:50 +0100
commitd4db3f164529013b11a171bb1bd38e8681ddaec8 (patch)
tree0198f14c37e86f88a7bc3443f93abc8cfbb266d4 /tools/perf/builtin-record.c
parent0422a4fc2c6a41c3d4184984797512af2650014e (diff)
downloadlinux-2.6.34-ux500-d4db3f164529013b11a171bb1bd38e8681ddaec8.tar.gz
perf record: We should fork only if a program was specified to run
IOW: Now 'perf record -a' works, this was a bug introduced in: 856e96608a72412d319e498a3a7c557571f811bd "perf record: Properly synchronize child creation" Also fix the -C usage, i.e. allow for profiling all the tasks in one CPU. Reported-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Paul Mackerras <paulus@samba.org> LKML-Reference: <1261957026-15580-1-git-send-email-acme@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 63136d0534d..26542532273 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -402,7 +402,7 @@ static void atexit_header(void)
perf_header__write(&session->header, output, true);
}
-static int __cmd_record(int argc __used, const char **argv)
+static int __cmd_record(int argc, const char **argv)
{
int i, counter;
struct stat st;
@@ -411,6 +411,7 @@ static int __cmd_record(int argc __used, const char **argv)
int err;
unsigned long waking = 0;
int child_ready_pipe[2], go_pipe[2];
+ const bool forks = target_pid == -1 && argc > 0;
char buf;
page_size = sysconf(_SC_PAGE_SIZE);
@@ -422,7 +423,7 @@ static int __cmd_record(int argc __used, const char **argv)
signal(SIGCHLD, sig_handler);
signal(SIGINT, sig_handler);
- if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
+ if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
perror("failed to create pipes");
exit(-1);
}
@@ -483,7 +484,7 @@ static int __cmd_record(int argc __used, const char **argv)
atexit(atexit_header);
- if (target_pid == -1) {
+ if (forks) {
pid = fork();
if (pid < 0) {
perror("failed to fork");
@@ -550,7 +551,7 @@ static int __cmd_record(int argc __used, const char **argv)
return err;
}
- if (!system_wide)
+ if (!system_wide && profile_cpu == -1)
event__synthesize_thread(pid, process_synthesized_event,
session);
else
@@ -569,7 +570,8 @@ static int __cmd_record(int argc __used, const char **argv)
/*
* Let the child rip
*/
- close(go_pipe[1]);
+ if (forks)
+ close(go_pipe[1]);
for (;;) {
int hits = samples;
@@ -667,7 +669,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
argc = parse_options(argc, argv, options, record_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (!argc && target_pid == -1 && (!system_wide || profile_cpu == -1))
+ if (!argc && target_pid == -1 && !system_wide && profile_cpu == -1)
usage_with_options(record_usage, options);
symbol__init();