This is a port on kernel 4.10 of the work done by Peter Zijlstra to handle page fault without holding the mm semaphore. http://linux-kernel.2935.n7.nabble.com/RFC-PATCH-0-6-Another-go-at-speculative-page-faults-tt965642.html#none This series is functional on x86, but there may be some pending issues. It's building on top of v4.10. Compared to the Peter initial work, this series introduces a try spin lock when dealing with speculative page fault. This is required to avoid dead lock when handling a page fault while a TLB invalidate is requested by an other CPU holding the PTE. Another change due to a lock dependency issue with mapping->i_mmap_rwsem. This series also protect changes to VMA's data which are read or change by the page fault handler. The protections is done through the VMA's sequence number. Laurent Dufour (11): mm: Introduce pte_spinlock mm/spf: Try spin lock in speculative path mm/spf: Fix fe.sequence init in __handle_mm_fault() mm/spf: don't set fault entry's fields if locking failed mm/spf; fix lock dependency against mapping->i_mmap_rwsem mm/spf: Protect changes to vm_flags mm/spf Protect vm_policy's changes against speculative pf x86/mm: Update the handle_speculative_fault's path mm/spf: Add check on the VMA's flags mm: protect madvise vs speculative pf mm/spf: protect mremap() against speculative pf Peter Zijlstra (6): mm: Dont assume page-table invariance during faults mm: Prepare for FAULT_FLAG_SPECULATIVE mm: VMA sequence count RCU free VMAs mm: Provide speculative fault infrastructure mm,x86: Add speculative pagefault handling arch/x86/mm/fault.c | 15 +++ fs/proc/task_mmu.c | 2 + include/linux/mm.h | 4 + include/linux/mm_types.h | 3 + kernel/fork.c | 1 + mm/init-mm.c | 1 + mm/internal.h | 18 +++ mm/madvise.c | 5 +- mm/memory.c | 284 +++++++++++++++++++++++++++++++++++++++-------- mm/mempolicy.c | 10 +- mm/mlock.c | 9 +- mm/mmap.c | 121 +++++++++++++++----- mm/mprotect.c | 2 + mm/mremap.c | 7 ++ 14 files changed, 402 insertions(+), 80 deletions(-) -- 2.7.4 -- 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>
