On Wed, Jul 09, 2014 at 06:41:31PM +0200, Joerg Roedel wrote: > On Tue, Jul 08, 2014 at 06:00:01PM -0400, j.glisse@xxxxxxxxx wrote: > > New user of the mmu_notifier interface need to lookup vma in order to > > perform the invalidation operation. Instead of redoing a vma lookup > > inside the callback just pass through the vma from the call site where > > it is already available. > > Why do you need to lookup the vma during the invalidation operation? > Given that invalidate_range_start/end can be expensive to implement on > the call-back side those calls should happen less instead of more > frequently. > To do different thing if vma is file backed and depending on the block device the file is in. Cheers, Jérôme -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>