[NET]: rt_check_expire() can take a long time, add a cond_resched()
On commit 39c90ece7565f5c47110c2fa77409d7a9478bd5b:
[IPV4]: Convert rt_check_expire() from softirq processing to workqueue.
we converted rt_check_expire() from softirq to workqueue, allowing the
function to perform all work it was supposed to do.
When the IP route cache is big, rt_check_expire() can take a long time
to run. (default settings : 20% of the hash table is scanned at each
invocation)
Adding cond_resched() helps giving cpu to higher priority tasks if
necessary.
Using a "if (need_resched())" test before calling "cond_resched();" is
necessary to avoid spending too much time doing the resched check.
(My tests gave a time reduction from 88 ms to 25 ms per
rt_check_expire() run on my i686 test machine)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 file changed
