From b44754d8262d3aab842998cf747f44fe6090be9f Mon Sep 17 00:00:00 2001 From: Petr Mladek Date: Mon, 15 Jun 2015 15:53:10 +0200 Subject: [PATCH] ring_buffer: Allow to exit the ring buffer benchmark immediately It takes a while until the ring_buffer_benchmark module is removed when the ring buffer hammer is running. It is because it takes few seconds and kthread_should_stop() is not being checked. This patch adds the check for kthread termination into the producer. It uses the existing @kill_test flag to finish the kthreads as cleanly as possible. It disables printing the "ERROR" message when the kthread is going. It makes sure that producer does not go into the 10sec sleep when it is being killed. Finally, it does not call wait_to_die() when kthread_should_stop() already returns true. Link: http://lkml.kernel.org/r/20150615155428.GD3135@pathway.suse.cz Signed-off-by: Petr Mladek Signed-off-by: Steven Rostedt --- kernel/trace/ring_buffer_benchmark.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index 2430563cf2bc..5ffbae3d3f86 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -263,6 +263,8 @@ static void ring_buffer_producer(void) if (cnt % wakeup_interval) cond_resched(); #endif + if (kthread_should_stop()) + kill_test = 1; } while (ktime_before(end_time, timeout) && !kill_test); trace_printk("End ring buffer hammer\n"); @@ -285,7 +287,7 @@ static void ring_buffer_producer(void) entries = ring_buffer_entries(buffer); overruns = ring_buffer_overruns(buffer); - if (kill_test) + if (kill_test && !kthread_should_stop()) trace_printk("ERROR!\n"); if (!disable_reader) { @@ -379,7 +381,7 @@ static int ring_buffer_consumer_thread(void *arg) } __set_current_state(TASK_RUNNING); - if (kill_test) + if (!kthread_should_stop()) wait_to_die(); return 0; @@ -399,13 +401,16 @@ static int ring_buffer_producer_thread(void *arg) } ring_buffer_producer(); + if (kill_test) + goto out_kill; trace_printk("Sleeping for 10 secs\n"); set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(HZ * SLEEP_TIME); } - if (kill_test) +out_kill: + if (!kthread_should_stop()) wait_to_die(); return 0; -- 2.34.1