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s390/cio: add cond_resched() in the slow_eval_known_fn() loop 

The scanning through subchannels during the time of an event could
take significant amount of time in case of platforms with lots of
known subchannels. This might result in higher scheduling latencies
for other tasks especially on systems with a single CPU. Add
cond_resched() call, as the loop in slow_eval_known_fn() can be
executed for a longer duration.

Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Vineeth Vijayan <vneethv@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
zero-sugar-mainline-defconfig
Vineeth Vijayan 2020-06-18 16:42:45 +02:00 committed by Heiko Carstens
parent 9123e3a74e
commit 0b8eb2ee9d
1 changed files with 5 additions and 0 deletions
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5
drivers/s390/cio/css.c
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@ -677,6 +677,11 @@ static int slow_eval_known_fn(struct subchannel *sch, void *data)
rc = css_evaluate_known_subchannel(sch, 1);
if (rc == -EAGAIN)
css_schedule_eval(sch->schid);
/*
* The loop might take long time for platforms with lots of
* known devices. Allow scheduling here.
*/
cond_resched();
}
return 0;
}