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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-06-02 15:52:24 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-02 16:16:26 +0200
commit97124d5e2df5b9eaa5bb684bb1e8ebc7e29d0f5d (patch)
tree3fcfeacdaefe0b268984a49ebf018b6c8ebbfe0d /Documentation
parentf70e87d7a6d9c5a23d5f43ed0a0c224c157ef597 (diff)
downloadop-kernel-dev-97124d5e2df5b9eaa5bb684bb1e8ebc7e29d0f5d.zip
op-kernel-dev-97124d5e2df5b9eaa5bb684bb1e8ebc7e29d0f5d.tar.gz
perf_counter: tools: Better handle existing data files
Provide an argument (-f) to overwrite existing data files. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: John Kacur <jkacur@redhat.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/perf_counter/builtin-record.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c
index 810fc27..bace7a8 100644
--- a/Documentation/perf_counter/builtin-record.c
+++ b/Documentation/perf_counter/builtin-record.c
@@ -7,6 +7,7 @@
#include "util/parse-events.h"
#include "util/string.h"
+#include <unistd.h>
#include <sched.h>
#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1)
@@ -26,7 +27,7 @@ static unsigned int realtime_prio = 0;
static int system_wide = 0;
static pid_t target_pid = -1;
static int inherit = 1;
-static int nmi = 1;
+static int force = 0;
const unsigned int default_count[] = {
1000000,
@@ -337,7 +338,6 @@ static void open_counters(int cpu, pid_t pid)
hw_event.config = event_id[counter];
hw_event.irq_period = event_count[counter];
hw_event.record_type = PERF_RECORD_IP | PERF_RECORD_TID;
- hw_event.nmi = nmi;
hw_event.mmap = track;
hw_event.comm = track;
hw_event.inherit = (cpu < 0) && inherit;
@@ -387,13 +387,20 @@ static int __cmd_record(int argc, const char **argv)
int i, counter;
pid_t pid;
int ret;
+ struct stat st;
page_size = sysconf(_SC_PAGE_SIZE);
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
assert(nr_cpus <= MAX_NR_CPUS);
assert(nr_cpus >= 0);
- output = open(output_name, O_CREAT|O_EXCL|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR);
+ if (!stat(output_name, &st) && !force) {
+ fprintf(stderr, "Error, output file: %s exists, use -f to overwrite.\n",
+ output_name);
+ exit(-1);
+ }
+
+ output = open(output_name, O_CREAT|O_TRUNC|O_RDWR, S_IRUSR|S_IWUSR);
if (output < 0) {
perror("failed to create output file");
exit(-1);
@@ -473,6 +480,8 @@ static const struct option options[] = {
"collect data with this RT SCHED_FIFO priority"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
+ OPT_BOOLEAN('f', "force", &force,
+ "overwrite existing data file"),
OPT_END()
};
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