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| author | Ingo Molnar <mingo@elte.hu> | 2009-06-05 13:27:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-05 13:39:23 +0200 |
| commit | cf1f45744c6fa3501e0a6f0ddc418f0ef27e725b (patch) | |
| tree | ca0823475af28c2b0bcbcc699111712d50836115 /Documentation/perf_counter/builtin-record.c | |
| parent | f250c030a87273f8838a2302bee7c2b4d03e9151 (diff) | |
| download | lwn-cf1f45744c6fa3501e0a6f0ddc418f0ef27e725b.tar.gz lwn-cf1f45744c6fa3501e0a6f0ddc418f0ef27e725b.zip | |
perf record, top: Implement --freq
Support frequency-based profiling and make it the default.
(Also add a Hz printout in perf top.)
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'Documentation/perf_counter/builtin-record.c')
| -rw-r--r-- | Documentation/perf_counter/builtin-record.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Documentation/perf_counter/builtin-record.c b/Documentation/perf_counter/builtin-record.c index 7f2d7ce94075..e2301f39e551 100644 --- a/Documentation/perf_counter/builtin-record.c +++ b/Documentation/perf_counter/builtin-record.c @@ -27,6 +27,7 @@ static int fd[MAX_NR_CPUS][MAX_COUNTERS]; static int nr_cpus = 0; static unsigned int page_size; static unsigned int mmap_pages = 128; +static int freq = 0; static int output; static const char *output_name = "perf.data"; static int group = 0; @@ -347,9 +348,10 @@ static void create_counter(int counter, int cpu, pid_t pid) attr.config = event_id[counter]; attr.sample_period = event_count[counter]; attr.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID; + attr.freq = freq; attr.mmap = track; attr.comm = track; - attr.inherit = (cpu < 0) && inherit; + attr.inherit = (cpu < 0) && inherit; track = 0; /* only the first counter needs these */ @@ -520,6 +522,8 @@ static const struct option options[] = { "output file name"), OPT_BOOLEAN('i', "inherit", &inherit, "child tasks inherit counters"), + OPT_INTEGER('F', "freq", &freq, + "profile at this frequency"), OPT_INTEGER('m', "mmap-pages", &mmap_pages, "number of mmap data pages"), OPT_END() @@ -540,6 +544,10 @@ int cmd_record(int argc, const char **argv, const char *prefix) event_id[0] = 0; } + if (freq) { + default_interval = freq; + freq = 1; + } for (counter = 0; counter < nr_counters; counter++) { if (event_count[counter]) continue; |