Messages in this thread | | | Date | Sun, 21 Apr 2013 21:06:55 +0200 | From | Borislav Petkov <> | Subject | Re: irq 16: nobody cared |
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On Sun, Apr 21, 2013 at 11:56:09AM -0700, Paul E. McKenney wrote: > CONFIG_RCU_FAST_NO_HZ will definitely change the timing, for example, > increasing grace-period durations by up to a factor of four. > > One way to figure out if this is the problem would be to either (1) > apply the following patch (assuming you have no more than a few tens > of CPUs)
Only 8 - I'm modest that way :)
> or (2) setting the sysfs rcutree.rcu_expedited variable to 1 just before > suspending the system. > > Either approach will force RCU to always use the faster expedited > grace periods for synchronize_rcu() and friends. They will -not- help > if someone has open-coded synchronize_rcu() in terms of call_rcu(), > though.
Right,
# echo 1 > /sys/kernel/rcu_expedited
helped.
No warning, no delay, 2 suspend/resume cycles back-to-back. So, a probable fix could be to force-enable the expedited grace periods during suspend...?
Hmmm.
Thanks.
-- Regards/Gruss, Boris.
Sent from a fat crate under my desk. Formatting is fine. --
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