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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>
This commit is contained in:
Steven Rostedt 2009-05-07 11:13:42 -04:00 committed by Steven Rostedt
parent 0ad5d703c6
commit 29c8000ee7
1 changed files with 7 additions and 30 deletions
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37
kernel/trace/ring_buffer_benchmark.c
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@ -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");