Re: [PATCH v10 18/25] mm: provide speculative fault infrastructure

On 15/05/2018 15:09, vinayak menon wrote: > On Tue, Apr 17, 2018 at 8:03 PM, Laurent Dufour > wrote: >> >> +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT >> + >> +#ifndef __HAVE_ARCH_PTE_SPECIAL >> +/* This is required by vm_normal_page() */ >> +#error "Speculative page fault

Re: [PATCH v10 18/25] mm: provide speculative fault infrastructure

On Tue, Apr 17, 2018 at 8:03 PM, Laurent Dufour wrote: > > +#ifdef CONFIG_SPECULATIVE_PAGE_FAULT > + > +#ifndef __HAVE_ARCH_PTE_SPECIAL > +/* This is required by vm_normal_page() */ > +#error "Speculative page fault handler requires __HAVE_ARCH_PTE_SPECIAL" > +#endif >

[PATCH v10 18/25] mm: provide speculative fault infrastructure

From: Peter Zijlstra Provide infrastructure to do a speculative fault (not holding mmap_sem). The not holding of mmap_sem means we can race against VMA change/removal and page-table destruction. We use the SRCU VMA freeing to keep the VMA around. We use the VMA seqcount to