diff options
| author | Mike Galbraith <efault@gmx.de> | 2009-10-12 07:56:03 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-10-12 09:10:55 +0200 |
| commit | 7e4ff9e3e8f88de8a8536f43294cd32b4e7d9123 (patch) | |
| tree | 4033b2ab865ce039f0287059c520be8703a08d42 /tools/perf/builtin-top.c | |
| parent | fe9081cc9bdabb0be953a39ad977cea14e35bce5 (diff) | |
| download | blackbird-op-linux-7e4ff9e3e8f88de8a8536f43294cd32b4e7d9123.tar.gz blackbird-op-linux-7e4ff9e3e8f88de8a8536f43294cd32b4e7d9123.zip | |
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/perf/builtin-top.c')
| -rw-r--r-- | tools/perf/builtin-top.c | 28 |
1 files changed, 21 insertions, 7 deletions
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: */ |
