From 6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Thu, 4 Jun 2009 08:53:05 +0200 Subject: [PATCH] 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 Acked-by: Peter Zijlstra Cc: Mike Galbraith Cc: Paul Mackerras Cc: Corey Ashford Cc: Marcelo Tosatti Cc: Arnaldo Carvalho de Melo Cc: Thomas Gleixner LKML-Reference: Signed-off-by: Ingo Molnar --- Documentation/perf_counter/builtin-top.c | 13 ++++++++----- 1 file 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() };