Davidlohr, I am sorry that I forgot to put in your tag.
Cheers, Longman -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Davidlohr Bueso Sent: Saturday, August 01, 2015 2:01 PM To: Long, Wai Man Cc: Peter Zijlstra; Ingo Molnar; Thomas Gleixner; H. Peter Anvin; [email protected]; [email protected]; Norton, Scott J; Hatch, Douglas B (HPS Linux PM) Subject: Re: [PATCH v4 1/7] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW_VAL On Fri, 2015-07-31 at 22:21 -0400, Waiman Long wrote: > The smp_store_release() is not a full barrier. In order to avoid > missed wakeup, we may need to add memory barrier around locked and cpu > state variables adding to complexity. As the chance of spurious wakeup > is very low, it is easier and safer to just do an unconditional kick > at unlock time. > > Signed-off-by: Waiman Long <[email protected]> Please keep tags from previous versions ;) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
