On Wed, 2014-09-17 at 11:34 +0200, Davidlohr Bueso wrote:
> On Tue, 2014-09-16 at 17:16 -0700, Jason Low wrote:
> > Commit 9b0fc9c09f1b checks for if there are known active lockers
> > in order to avoid write trylocking using expensive cmpxchg() when
> > it likely wouldn't get the lock.
>
> Ah, I
On Tue, 2014-09-16 at 17:16 -0700, Jason Low wrote:
> Commit 9b0fc9c09f1b checks for if there are known active lockers
> in order to avoid write trylocking using expensive cmpxchg() when
> it likely wouldn't get the lock.
Ah, I remember you had this one in your queue for some time :)
> However, a
Commit 9b0fc9c09f1b checks for if there are known active lockers
in order to avoid write trylocking using expensive cmpxchg() when
it likely wouldn't get the lock.
However, a subsequent patch was added such that we directly
check for sem->count == RWSEM_WAITING_BIAS right before trying
that cmpxch
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