diff options
author | Steven Rostedt <srostedt@redhat.com> | 2009-05-07 19:13:42 +0400 |
---|---|---|
committer | Steven Rostedt <rostedt@goodmis.org> | 2009-05-07 19:16:18 +0400 |
commit | 29c8000ee7da3a6756d26143991e573eaaf2a9f6 (patch) | |
tree | 4c57a374639127ebccd6f4fca0feb02cde21e702 /kernel | |
parent | 0ad5d703c6c0fcd385d956555460df95dff7eb7e (diff) | |
download | linux-29c8000ee7da3a6756d26143991e573eaaf2a9f6.tar.xz |
ring-buffer: remove complex calculations in ring-buffer-test
Ingo Molnar thought that the code to calculate the time in cond_resched
is a bit too ugly and is not needed. This patch removes it and replaces
it with a simple call to cond_resched. I kept the comment that explains
the reason for the cond_resched.
[ Impact: remove ugly code ]
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/trace/ring_buffer_benchmark.c | 37 |
1 files changed, 7 insertions, 30 deletions
diff --git a/kernel/trace/ring_buffer_benchmark.c b/kernel/trace/ring_buffer_benchmark.c index a26fc67b63bb..f4ceb453c7dd 100644 --- a/kernel/trace/ring_buffer_benchmark.c +++ b/kernel/trace/ring_buffer_benchmark.c @@ -185,35 +185,6 @@ static void ring_buffer_consumer(void) complete(&read_done); } -/* - * If we are a non preempt kernel, the 10 second run will - * stop everything while it runs. Instead, we will call cond_resched - * and also add any time that was lost by a rescedule. - */ -#ifdef CONFIG_PREEMPT -static void sched_if_needed(struct timeval *start_tv, struct timeval *end_tv) -{ -} -#else -static void sched_if_needed(struct timeval *start_tv, struct timeval *end_tv) -{ - struct timeval tv; - - cond_resched(); - do_gettimeofday(&tv); - if (tv.tv_usec < end_tv->tv_usec) { - tv.tv_usec += 1000000; - tv.tv_sec--; - } - start_tv->tv_sec += tv.tv_sec - end_tv->tv_sec; - start_tv->tv_usec += tv.tv_usec - end_tv->tv_usec; - if (start_tv->tv_usec > 1000000) { - start_tv->tv_usec -= 1000000; - start_tv->tv_sec++; - } -} -#endif - static void ring_buffer_producer(void) { struct timeval start_tv; @@ -250,7 +221,13 @@ static void ring_buffer_producer(void) if (consumer && !(++cnt % wakeup_interval)) wake_up_process(consumer); - sched_if_needed(&start_tv, &end_tv); + /* + * If we are a non preempt kernel, the 10 second run will + * stop everything while it runs. Instead, we will call + * cond_resched and also add any time that was lost by a + * rescedule. + */ + cond_resched(); } while (end_tv.tv_sec < (start_tv.tv_sec + RUN_TIME) && !kill_test); pr_info("End ring buffer hammer\n"); |