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authorEric B Munson <ebmunson@us.ibm.com>2010-03-15 11:46:57 -0300
committerIngo Molnar <mingo@elte.hu>2010-03-15 16:08:22 +0100
commitbedbfdea31daf3880745001d56450c683959ee7e (patch)
treef039ee87fc0c76805f5f42c46b25ee732b8d6e0c /tools/perf/builtin-record.c
parente4495262826d1eabca3529fa6ac22394eb348132 (diff)
downloadlinux-2.6.34-ux500-bedbfdea31daf3880745001d56450c683959ee7e.tar.gz
perf record: Enable the enable_on_exec flag if record forks the target
When forking its target, perf record can capture data from before the target application is started. Perf stat uses the enable_on_exec flag in the event attributes to keep from displaying events from before the target program starts, this patch adds the same functionality to perf record when it is will fork the target process. Signed-off-by: Eric B Munson <ebmunson@us.ibm.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <1268664418-28328-1-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.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index bed175d59e5..962cdbf44ae 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -225,7 +225,7 @@ static struct perf_header_attr *get_header_attr(struct perf_event_attr *a, int n
return h_attr;
}
-static void create_counter(int counter, int cpu, pid_t pid)
+static void create_counter(int counter, int cpu, pid_t pid, bool forks)
{
char *filter = filters[counter];
struct perf_event_attr *attr = attrs + counter;
@@ -277,6 +277,9 @@ static void create_counter(int counter, int cpu, pid_t pid)
attr->inherit = inherit;
attr->disabled = 1;
+ if (forks)
+ attr->enable_on_exec = 1;
+
try_again:
fd[nr_cpu][counter] = sys_perf_event_open(attr, pid, cpu, group_fd, 0);
@@ -381,13 +384,13 @@ try_again:
ioctl(fd[nr_cpu][counter], PERF_EVENT_IOC_ENABLE);
}
-static void open_counters(int cpu, pid_t pid)
+static void open_counters(int cpu, pid_t pid, bool forks)
{
int counter;
group_fd = -1;
for (counter = 0; counter < nr_counters; counter++)
- create_counter(counter, cpu, pid);
+ create_counter(counter, cpu, pid, forks);
nr_cpu++;
}
@@ -547,11 +550,11 @@ static int __cmd_record(int argc, const char **argv)
if ((!system_wide && !inherit) || profile_cpu != -1) {
- open_counters(profile_cpu, target_pid);
+ open_counters(profile_cpu, target_pid, forks);
} else {
nr_cpus = read_cpu_map();
for (i = 0; i < nr_cpus; i++)
- open_counters(cpumap[i], target_pid);
+ open_counters(cpumap[i], target_pid, forks);
}
if (file_new) {