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authorIngo Molnar <mingo@elte.hu>2009-06-04 08:53:05 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-04 09:02:12 +0200
commit6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4 (patch)
tree0a883faa7e870ccac443a0697b66c4a6f275fe3a
parenta4c43beaff0fe6c83aa2505dce8ffe65db8e0a33 (diff)
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.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index 7c907e25d82..3f7778ba00b 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()
};