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| author | Ingo Molnar <mingo@elte.hu> | 2009-06-04 08:53:05 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-04 09:02:12 +0200 |
| commit | 6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4 (patch) | |
| tree | 0a883faa7e870ccac443a0697b66c4a6f275fe3a | |
| parent | a4c43beaff0fe6c83aa2505dce8ffe65db8e0a33 (diff) | |
| download | op-kernel-dev-6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4.zip op-kernel-dev-6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4.tar.gz | |
perf top: Reduce default filter threshold
On idle systems 'perf top' comes up empty by default, because the event
count filter is set to 100.
Reduce it to 5 instead.
Also add an option to limit the number of functions displayed.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Acked-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>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | Documentation/perf_counter/builtin-top.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c index 7c907e2..3f7778b 100644 --- a/Documentation/perf_counter/builtin-top.c +++ b/Documentation/perf_counter/builtin-top.c @@ -64,9 +64,10 @@ static int default_interval = 100000; static int event_count[MAX_COUNTERS]; static int fd[MAX_NR_CPUS][MAX_COUNTERS]; -static __u64 count_filter = 100; +static __u64 count_filter = 5; +static int print_entries = 15; -static int target_pid = -1; +static int target_pid = -1; static int profile_cpu = -1; static int nr_cpus = 0; static unsigned int realtime_prio = 0; @@ -254,7 +255,7 @@ static void print_sym_table(void) struct symbol *sym = (struct symbol *)(syme + 1); float pcnt; - if (++printed > 18 || syme->snap_count < count_filter) + if (++printed > print_entries || syme->snap_count < count_filter) continue; pcnt = 100.0 - (100.0 * ((sum_kevents - syme->snap_count) / @@ -650,7 +651,7 @@ static const struct option options[] = { "number of seconds to delay between refreshes"), OPT_BOOLEAN('D', "dump-symtab", &dump_symtab, "dump the symbol table used for profiling"), - OPT_INTEGER('f', "--count-filter", &count_filter, + OPT_INTEGER('f', "count-filter", &count_filter, "only display functions with more events than this"), OPT_BOOLEAN('g', "group", &group, "put the counters into a counter group"), @@ -662,8 +663,10 @@ static const struct option options[] = { "track mmap events"), OPT_BOOLEAN('U', "use-munmap", &use_munmap, "track munmap events"), - OPT_INTEGER('F', "--freq", &freq, + OPT_INTEGER('F', "freq", &freq, "profile at this frequency"), + OPT_INTEGER('E', "entries", &print_entries, + "display this many functions"), OPT_END() }; |
