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authorMike Galbraith <efault@gmx.de>2009-10-12 07:56:03 +0200
committerIngo Molnar <mingo@elte.hu>2009-10-12 09:10:55 +0200
commit7e4ff9e3e8f88de8a8536f43294cd32b4e7d9123 (patch)
tree4033b2ab865ce039f0287059c520be8703a08d42 /tools
parentfe9081cc9bdabb0be953a39ad977cea14e35bce5 (diff)
downloadblackbird-op-linux-7e4ff9e3e8f88de8a8536f43294cd32b4e7d9123.tar.gz
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perf tools: Fix counter sample frequency breakage
Commit 42e59d7d19dc4b4 switched to a default sample frequency of 1KHz, which overrides any user supplied count, causing sched, top and timechart to miss events due to their discrete events being flagged PERF_SAMPLE_PERIOD. Override default sample frequency when the user profides a period count, and make both record and top honor that user supplied option. Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Arjan van de Ven <arjan@infradead.org> LKML-Reference: <1255326963.15107.2.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-record.c14
-rw-r--r--tools/perf/builtin-top.c28
2 files changed, 34 insertions, 8 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 59af03d80d07..4e3a374e7aa7 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -26,7 +26,7 @@
static int fd[MAX_NR_CPUS][MAX_COUNTERS];
-static long default_interval = 100000;
+static long default_interval = 0;
static int nr_cpus = 0;
static unsigned int page_size;
@@ -730,6 +730,18 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
attrs[0].config = PERF_COUNT_HW_CPU_CYCLES;
}
+ /*
+ * User specified count overrides default frequency.
+ */
+ if (default_interval)
+ freq = 0;
+ else if (freq) {
+ default_interval = freq;
+ } else {
+ fprintf(stderr, "frequency and count are zero, aborting\n");
+ exit(EXIT_FAILURE);
+ }
+
for (counter = 0; counter < nr_counters; counter++) {
if (attrs[counter].sample_period)
continue;
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index d978dc99236c..c0f69e80b2cc 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -57,7 +57,7 @@ static int fd[MAX_NR_CPUS][MAX_COUNTERS];
static int system_wide = 0;
-static int default_interval = 100000;
+static int default_interval = 0;
static int count_filter = 5;
static int print_entries = 15;
@@ -975,7 +975,13 @@ static void start_counter(int i, int counter)
attr = attrs + counter;
attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
- attr->freq = freq;
+
+ if (freq) {
+ attr->sample_type |= PERF_SAMPLE_PERIOD;
+ attr->freq = 1;
+ attr->sample_freq = freq;
+ }
+
attr->inherit = (cpu < 0) && inherit;
try_again:
@@ -1130,11 +1136,6 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
if (argc)
usage_with_options(top_usage, options);
- if (freq) {
- default_interval = freq;
- freq = 1;
- }
-
/* CPU and PID are mutually exclusive */
if (target_pid != -1 && profile_cpu != -1) {
printf("WARNING: PID switch overriding CPU\n");
@@ -1151,6 +1152,19 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
parse_symbols();
parse_source(sym_filter_entry);
+
+ /*
+ * User specified count overrides default frequency.
+ */
+ if (default_interval)
+ freq = 0;
+ else if (freq) {
+ default_interval = freq;
+ } else {
+ fprintf(stderr, "frequency and count are zero, aborting\n");
+ exit(EXIT_FAILURE);
+ }
+
/*
* Fill in the ones not specifically initialized via -c:
*/
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