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perf tools: Fix counter sample frequency breakage

Browse source 
Commit 42e59d7d19 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>
This commit is contained in:
Mike Galbraith 2009-10-12 07:56:03 +02:00 committed by Ingo Molnar
parent fe9081cc9b
commit 7e4ff9e3e8
2 changed files with 34 additions and 8 deletions
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14
tools/perf/builtin-record.c
View file

@ -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;

28
tools/perf/builtin-top.c
View file

@ -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:
*/