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Date: Wed, 13 Jan 2010 10:31:52 GMT
From: tip-bot for Liming Wang <liming.wang@...driver.com>
To: linux-tip-commits@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
mingo@...hat.com, peterz@...radead.org, fweisbec@...il.com,
tglx@...utronix.de, liming.wang@...driver.com, mingo@...e.hu
Subject: [tip:perf/core] perf tools: Fix --pid option for stat
Commit-ID: 60666c630bdb33983a894b050b588b663f38f368
Gitweb: http://git.kernel.org/tip/60666c630bdb33983a894b050b588b663f38f368
Author: Liming Wang <liming.wang@...driver.com>
AuthorDate: Thu, 31 Dec 2009 16:05:50 +0800
Committer: Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 13 Jan 2010 10:09:08 +0100
perf tools: Fix --pid option for stat
current pid option doesn't work for perf stat. Change it to what
perf record --pid acts as.
Signed-off-by: Liming Wang <liming.wang@...driver.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <peterz@...radead.org>
LKML-Reference: <1262246750-2191-1-git-send-email-liming.wang@...driver.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
tools/perf/builtin-stat.c | 106 ++++++++++++++++++++++++++-------------------
1 files changed, 61 insertions(+), 45 deletions(-)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index c70d720..e8c85d5 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -44,6 +44,7 @@
#include "util/parse-events.h"
#include "util/event.h"
#include "util/debug.h"
+#include "util/header.h"
#include <sys/prctl.h>
#include <math.h>
@@ -79,6 +80,8 @@ static int fd[MAX_NR_CPUS][MAX_COUNTERS];
static int event_scaled[MAX_COUNTERS];
+static volatile int done = 0;
+
struct stats
{
double n, mean, M2;
@@ -247,61 +250,64 @@ static int run_perf_stat(int argc __used, const char **argv)
unsigned long long t0, t1;
int status = 0;
int counter;
- int pid;
+ int pid = target_pid;
int child_ready_pipe[2], go_pipe[2];
+ const bool forks = (target_pid == -1 && argc > 0);
char buf;
if (!system_wide)
nr_cpus = 1;
- 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);
}
- if ((pid = fork()) < 0)
- perror("failed to fork");
+ if (forks) {
+ if ((pid = fork()) < 0)
+ perror("failed to fork");
+
+ if (!pid) {
+ close(child_ready_pipe[0]);
+ close(go_pipe[1]);
+ fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
+
+ /*
+ * Do a dummy execvp to get the PLT entry resolved,
+ * so we avoid the resolver overhead on the real
+ * execvp call.
+ */
+ execvp("", (char **)argv);
+
+ /*
+ * Tell the parent we're ready to go
+ */
+ close(child_ready_pipe[1]);
+
+ /*
+ * Wait until the parent tells us to go.
+ */
+ if (read(go_pipe[0], &buf, 1) == -1)
+ perror("unable to read pipe");
+
+ execvp(argv[0], (char **)argv);
+
+ perror(argv[0]);
+ exit(-1);
+ }
- if (!pid) {
- close(child_ready_pipe[0]);
- close(go_pipe[1]);
- fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
+ child_pid = pid;
/*
- * Do a dummy execvp to get the PLT entry resolved,
- * so we avoid the resolver overhead on the real
- * execvp call.
- */
- execvp("", (char **)argv);
-
- /*
- * Tell the parent we're ready to go
+ * Wait for the child to be ready to exec.
*/
close(child_ready_pipe[1]);
-
- /*
- * Wait until the parent tells us to go.
- */
- if (read(go_pipe[0], &buf, 1) == -1)
+ close(go_pipe[0]);
+ if (read(child_ready_pipe[0], &buf, 1) == -1)
perror("unable to read pipe");
-
- execvp(argv[0], (char **)argv);
-
- perror(argv[0]);
- exit(-1);
+ close(child_ready_pipe[0]);
}
- child_pid = pid;
-
- /*
- * Wait for the child to be ready to exec.
- */
- close(child_ready_pipe[1]);
- close(go_pipe[0]);
- if (read(child_ready_pipe[0], &buf, 1) == -1)
- perror("unable to read pipe");
- close(child_ready_pipe[0]);
-
for (counter = 0; counter < nr_counters; counter++)
create_perf_stat_counter(counter, pid);
@@ -310,8 +316,12 @@ static int run_perf_stat(int argc __used, const char **argv)
*/
t0 = rdclock();
- close(go_pipe[1]);
- wait(&status);
+ if (forks) {
+ close(go_pipe[1]);
+ wait(&status);
+ } else {
+ while(!done);
+ }
t1 = rdclock();
@@ -417,10 +427,13 @@ static void print_stat(int argc, const char **argv)
fflush(stdout);
fprintf(stderr, "\n");
- fprintf(stderr, " Performance counter stats for \'%s", argv[0]);
-
- for (i = 1; i < argc; i++)
- fprintf(stderr, " %s", argv[i]);
+ fprintf(stderr, " Performance counter stats for ");
+ if(target_pid == -1) {
+ fprintf(stderr, "\'%s", argv[0]);
+ for (i = 1; i < argc; i++)
+ fprintf(stderr, " %s", argv[i]);
+ }else
+ fprintf(stderr, "task pid \'%d", target_pid);
fprintf(stderr, "\'");
if (run_count > 1)
@@ -445,6 +458,9 @@ static volatile int signr = -1;
static void skip_signal(int signo)
{
+ if(target_pid != -1)
+ done = 1;
+
signr = signo;
}
@@ -461,7 +477,7 @@ static void sig_atexit(void)
}
static const char * const stat_usage[] = {
- "perf stat [<options>] <command>",
+ "perf stat [<options>] [<command>]",
NULL
};
@@ -492,7 +508,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
argc = parse_options(argc, argv, options, stat_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
- if (!argc)
+ if (!argc && target_pid == -1)
usage_with_options(stat_usage, options);
if (run_count <= 0)
usage_with_options(stat_usage, options);
--
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