From: Jason Wang <jasowang@redhat.com> To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, peterx@redhat.com, James.Bottomley@hansenpartnership.com, hch@infradead.org, davem@davemloft.net, jglisse@redhat.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-parisc@vger.kernel.org, christophe.de.dinechin@gmail.com, jrdr.linux@gmail.com Subject: [PATCH net-next 0/6] vhost: accelerate metadata access Date: Fri, 24 May 2019 04:12:12 -0400 [thread overview] Message-ID: <20190524081218.2502-1-jasowang@redhat.com> (raw) Hi: This series tries to access virtqueue metadata through kernel virtual address instead of copy_user() friends since they had too much overheads like checks, spec barriers or even hardware feature toggling like SMAP. This is done through setup kernel address through direct mapping and co-opreate VM management with MMU notifiers. Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see obvious improvement. Thanks Changes from RFC V3: - rebase to net-next - Tweak on the comments Changes from RFC V2: - switch to use direct mapping instead of vmap() - switch to use spinlock + RCU to synchronize MMU notifier and vhost data/control path - set dirty pages in the invalidation callbacks - always use copy_to/from_users() friends for the archs that may need flush_dcache_pages() - various minor fixes Changes from V4: - use invalidate_range() instead of invalidate_range_start() - track dirty pages Changes from V3: - don't try to use vmap for file backed pages - rebase to master Changes from V2: - fix buggy range overlapping check - tear down MMU notifier during vhost ioctl to make sure invalidation request can read metadata userspace address and vq size without holding vq mutex. Changes from V1: - instead of pinning pages, use MMU notifier to invalidate vmaps and remap duing metadata prefetch - fix build warning on MIPS Jason Wang (6): vhost: generalize adding used elem vhost: fine grain userspace memory accessors vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() vhost: introduce helpers to get the size of metadata area vhost: factor out setting vring addr and num vhost: access vq metadata through kernel virtual address drivers/vhost/net.c | 4 +- drivers/vhost/vhost.c | 850 ++++++++++++++++++++++++++++++++++++------ drivers/vhost/vhost.h | 38 +- 3 files changed, 766 insertions(+), 126 deletions(-) -- 2.18.1
WARNING: multiple messages have this Message-ID (diff)
From: Jason Wang <jasowang@redhat.com> To: mst@redhat.com, jasowang@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Cc: hch@infradead.org, christophe.de.dinechin@gmail.com, linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org, peterx@redhat.com, James.Bottomley@hansenpartnership.com, linux-mm@kvack.org, jglisse@redhat.com, jrdr.linux@gmail.com, davem@davemloft.net, linux-arm-kernel@lists.infradead.org Subject: [PATCH net-next 0/6] vhost: accelerate metadata access Date: Fri, 24 May 2019 04:12:12 -0400 [thread overview] Message-ID: <20190524081218.2502-1-jasowang@redhat.com> (raw) Hi: This series tries to access virtqueue metadata through kernel virtual address instead of copy_user() friends since they had too much overheads like checks, spec barriers or even hardware feature toggling like SMAP. This is done through setup kernel address through direct mapping and co-opreate VM management with MMU notifiers. Test shows about 23% improvement on TX PPS. TCP_STREAM doesn't see obvious improvement. Thanks Changes from RFC V3: - rebase to net-next - Tweak on the comments Changes from RFC V2: - switch to use direct mapping instead of vmap() - switch to use spinlock + RCU to synchronize MMU notifier and vhost data/control path - set dirty pages in the invalidation callbacks - always use copy_to/from_users() friends for the archs that may need flush_dcache_pages() - various minor fixes Changes from V4: - use invalidate_range() instead of invalidate_range_start() - track dirty pages Changes from V3: - don't try to use vmap for file backed pages - rebase to master Changes from V2: - fix buggy range overlapping check - tear down MMU notifier during vhost ioctl to make sure invalidation request can read metadata userspace address and vq size without holding vq mutex. Changes from V1: - instead of pinning pages, use MMU notifier to invalidate vmaps and remap duing metadata prefetch - fix build warning on MIPS Jason Wang (6): vhost: generalize adding used elem vhost: fine grain userspace memory accessors vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() vhost: introduce helpers to get the size of metadata area vhost: factor out setting vring addr and num vhost: access vq metadata through kernel virtual address drivers/vhost/net.c | 4 +- drivers/vhost/vhost.c | 850 ++++++++++++++++++++++++++++++++++++------ drivers/vhost/vhost.h | 38 +- 3 files changed, 766 insertions(+), 126 deletions(-) -- 2.18.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-05-24 8:12 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-24 8:12 Jason Wang [this message] 2019-05-24 8:12 ` [PATCH net-next 0/6] vhost: accelerate metadata access Jason Wang 2019-05-24 8:12 ` [PATCH net-next 1/6] vhost: generalize adding used elem Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 2/6] vhost: fine grain userspace memory accessors Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 3/6] vhost: rename vq_iotlb_prefetch() to vq_meta_prefetch() Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 4/6] vhost: introduce helpers to get the size of metadata area Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 5/6] vhost: factor out setting vring addr and num Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` [PATCH net-next 6/6] vhost: access vq metadata through kernel virtual address Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-24 8:12 ` Jason Wang 2019-05-30 18:07 ` [PATCH net-next 0/6] vhost: accelerate metadata access David Miller 2019-05-30 18:07 ` David Miller 2019-05-30 18:07 ` David Miller 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:13 ` Michael S. Tsirkin 2019-05-30 18:55 ` David Miller 2019-05-30 18:55 ` David Miller 2019-05-30 18:55 ` David Miller 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-05 20:27 ` Michael S. Tsirkin 2019-06-10 3:50 ` Jason Wang 2019-06-10 3:50 ` Jason Wang 2019-06-10 3:50 ` Jason Wang -- strict thread matches above, loose matches on Subject: below -- 2019-05-24 8:12 Jason Wang
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