perf tools: Default to 1 KHz auto-sampling freq events

Use auto-freq events by default in perf record and
perf top.

This allows more consistent hardware event sampling,
regardless of the intensity of the underlying event.

It also keeps us from over-sampling on larger/busier
systems.

(also make surrounding initializations more consistent)

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>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

tools/perf/builtin-record.c

@@ -32,7 +32,7 @@ static long			default_interval		= 100000;
 static int			nr_cpus				=      0;
 static unsigned int		page_size;
 static unsigned int		mmap_pages			=    128;
-static int			freq				= 0;
+static int			freq				=   1000;
 static int			output;
 static const char		*output_name			= "perf.data";
 static int			group				=      0;
@@ -52,20 +52,20 @@ static int			sample_address			= 0;
 static int			multiplex			=      0;
 static int			multiplex_fd			=     -1;
 
-static long			samples;
+static long			samples				=      0;
 static struct timeval		last_read;
 static struct timeval		this_read;
 
-static u64			bytes_written;
+static u64			bytes_written			=      0;
 
 static struct pollfd		event_array[MAX_NR_CPUS * MAX_COUNTERS];
 
-static int			nr_poll;
-static int			nr_cpu;
+static int			nr_poll				=      0;
+static int			nr_cpu				=      0;
 
 static int			file_new			=      1;
 
-struct perf_header		*header;
+struct perf_header		*header				=   NULL;
 
 struct mmap_data {
 	int			counter;

tools/perf/builtin-top.c

@@ -70,11 +70,11 @@ static unsigned int		realtime_prio			=  0;
 static int			group				=      0;
 static unsigned int		page_size;
 static unsigned int		mmap_pages			=     16;
-static int			freq				=  0;
+static int			freq				=   1000; /* 1 KHz */
 
 static int			delay_secs			=      2;
-static int			zero;
-static int			dump_symtab;
+static int			zero                            =      0;
+static int			dump_symtab                     =      0;
 
 /*
  * Source