On Tue, May 27, 2014 at 11:31:21AM -0500, Christoph Lameter wrote: > On Tue, 27 May 2014, Peter Zijlstra wrote: > > > On Tue, May 27, 2014 at 10:14:10AM -0500, Christoph Lameter wrote: > > > On Tue, 27 May 2014, Peter Zijlstra wrote: > > > > > > > Well, like with IB, they start out as normal userspace pages, and will > > > > be from ZONE_MOVABLE. > > > > > > Well we could change that now I think. If the VMA has VM_PINNED set > > > pages then do not allocate from ZONE_MOVABLE. > > > > But most allocations sites don't have the vma. We allocate page-cache > > pages based on its address_space/mapping, not on whatever vma they're > > mapped into. > > Most allocations by the application for an address range also must > consider a memory allocation policy which is also bound to a vma and we > have code for that in mm/mempolicy.c > > Code could be easily added to alloc_pages_vma() to consider the pinned > status on allocation. Remove GFP_MOVABLE if the vma is pinned. Yes, but alloc_pages_vma() isn't used for shared pages (with exception of shmem and hugetlbfs). So whichever way around we have to do the mm_populate() + eviction hook + migration code, and since that equally covers the anon case, why bother? -- 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>