From 98e4833ba3c314c99dc364012fba6ac894230ad0 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 23 Nov 2009 08:03:09 +0100 Subject: ring-buffer benchmark: Run producer/consumer threads at nice +19 The ring-buffer benchmark threads run on nice 0 by default, using up a lot of CPU time and slowing down the system: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1024 root 20 0 0 0 0 D 95.3 0.0 4:01.67 rb_producer 1023 root 20 0 0 0 0 R 93.5 0.0 2:54.33 rb_consumer 21569 mingo 40 0 14852 1048 772 R 3.6 0.1 0:00.05 top 1 root 40 0 4080 928 668 S 0.0 0.0 0:23.98 init Renice them to +19 to make them less intrusive. Cc: Steven Rostedt Cc: Frederic Weisbecker Cc: Peter Zijlstra Cc: Mike Galbraith LKML-Reference: Signed-off-by: Ingo Molnar --- kernel/trace/ring_buffer_benchmark.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'kernel') diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 70df73e4ff21..3875d49da990 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -399,6 +399,12 @@ static int __init ring_buffer_benchmark_init(void) if (IS_ERR(producer)) goto out_kill; + /* + * Run them as low-prio background tasks by default: + */ + set_user_nice(consumer, 19); + set_user_nice(producer, 19); + return 0; out_kill: -- cgit v1.2.3