On Fri, Aug 30, 2019 at 01:27:25PM +0100, Robin Murphy wrote:
> On 30/08/2019 11:49, Joerg Roedel wrote:
> > Looks good to me, but adding Robin for his opinion.
>
> Sounds reasonable to me too - that should also be true for the majority of
> Arm systems that we know of. Will suggested that atomic_
On 30/08/2019 11:49, Joerg Roedel wrote:
Looks good to me, but adding Robin for his opinion.
Sounds reasonable to me too - that should also be true for the majority
of Arm systems that we know of. Will suggested that atomic_try_cmpxchg()
might be relevant, but AFAICS that's backwards compared
Looks good to me, but adding Robin for his opinion.
On Wed, Aug 28, 2019 at 06:13:38AM -0700, Eric Dumazet wrote:
> In commit 14bd9a607f90 ("iommu/iova: Separate atomic variables
> to improve performance") Jinyu Qi identified that the atomic_cmpxchg()
> in queue_iova() was causing a performance lo
In commit 14bd9a607f90 ("iommu/iova: Separate atomic variables
to improve performance") Jinyu Qi identified that the atomic_cmpxchg()
in queue_iova() was causing a performance loss and moved critical fields
so that the false sharing would not impact them.
However, avoiding the false sharing in the
