linux-kernel - [tip:perfcounters/core] perf top: Reduce default filter threshold

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Date:	Thu, 4 Jun 2009 08:06:33 GMT
From:	tip-bot for Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com, paulus@...ba.org,
	hpa@...or.com, mingo@...hat.com, a.p.zijlstra@...llo.nl,
	efault@....de, rostedt@...dmis.org, mtosatti@...hat.com,
	tglx@...utronix.de, cjashfor@...ux.vnet.ibm.com, mingo@...e.hu
Subject: [tip:perfcounters/core] perf top: Reduce default filter threshold

Commit-ID:  6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4
Gitweb:     http://git.kernel.org/tip/6e53cdf11dfc8d302ebb67e7112d1baf8d7c66d4
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Thu, 4 Jun 2009 08:53:05 +0200
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Thu, 4 Jun 2009 09:02:12 +0200

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@...dmis.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Mike Galbraith <efault@....de>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: Marcelo Tosatti <mtosatti@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 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()
 };
 
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