Re: RFC: call_rcu_outstanding (was Re: WARNING in __mmdrop)
From: Joel Fernandes <hidden>
Date: 2019-07-22 15:14:45
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linux-mm, lkml
[snip]
quoted
Would it make sense to have call_rcu() check to see if there are many outstanding requests on this CPU and if so process them before returning? That would ensure that frequent callers usually ended up doing their own processing.
Other than what Paul already mentioned about deadlocks, I am not sure if this would even work for all cases since call_rcu() has to wait for a grace period. So, if the number of outstanding requests are higher than a certain amount, then you *still* have to wait for some RCU configurations for the grace period duration and cannot just execute the callback in-line. Did I miss something? Can waiting in-line for a grace period duration be tolerated in the vhost case? thanks, - Joel _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel