Thank you, Alex! I'll try it and let you know the result soon. :) On Fri, Jan 17, 2020 at 02:17:49AM +0800, Alex Williamson wrote: > Hi Yan, > > I wonder if this might reduce the lock contention you're seeing in the > vfio_dma_rw series. These are only compile tested on my end, so I hope > they're not too broken to test. Thanks, > > Alex > > --- > > Alex Williamson (3): > vfio/type1: Convert vfio_iommu.lock from mutex to rwsem > vfio/type1: Replace obvious read lock instances > vfio/type1: Introduce pfn_list mutex > > > drivers/vfio/vfio_iommu_type1.c | 67 ++++++++++++++++++++++++--------------- > 1 file changed, 41 insertions(+), 26 deletions(-) >
