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| author | Ingo Molnar <mingo@elte.hu> | 2009-11-23 08:03:09 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-11-23 08:03:09 +0100 |
| commit | 98e4833ba3c314c99dc364012fba6ac894230ad0 (patch) | |
| tree | 0730af86569f560f7f4421a2d0f4bf9441df19c6 /kernel/trace/ring_buffer_benchmark.c | |
| parent | 192dcf1d1775736627280a5dd4cb0f605b21857a (diff) | |
| download | lwn-98e4833ba3c314c99dc364012fba6ac894230ad0.tar.gz lwn-98e4833ba3c314c99dc364012fba6ac894230ad0.zip | |
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 <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/ring_buffer_benchmark.c')
| -rw-r--r-- | kernel/trace/ring_buffer_benchmark.c | 6 |
1 files changed, 6 insertions, 0 deletions
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: |