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4334 Improve ZFS N-way mirror read performance

*** 23,32 **** --- 23,33 ---- * Use is subject to license terms. */ /* * Copyright (c) 2013 by Delphix. All rights reserved. + * Copyright (c) 2013 Steven Hartland. All rights reserved. */ #include <sys/zfs_context.h> #include <sys/vdev_impl.h> #include <sys/spa_impl.h>
*** 227,236 **** --- 228,239 ---- avl_create(&vq->vq_class[p].vqc_queued_tree, fifo ? vdev_queue_timestamp_compare : vdev_queue_offset_compare, sizeof (zio_t), offsetof(struct zio, io_queue_node)); } + + vq->vq_lastoffset = 0; } void vdev_queue_fini(vdev_t *vd) {
*** 723,727 **** --- 726,754 ---- mutex_enter(&vq->vq_lock); } mutex_exit(&vq->vq_lock); } + + /* + * As these three methods are only used for load calculations we're not + * concerned if we get an incorrect value on 32bit platforms due to lack of + * vq_lock mutex use here, instead we prefer to keep it lock free for + * performance. + */ + int + vdev_queue_length(vdev_t *vd) + { + return (avl_numnodes(&vd->vdev_queue.vq_pending_tree)); + } + + uint64_t + vdev_queue_lastoffset(vdev_t *vd) + { + return (vd->vdev_queue.vq_lastoffset); + } + + void + vdev_queue_register_lastoffset(vdev_t *vd, zio_t *zio) + { + vd->vdev_queue.vq_lastoffset = zio->io_offset + zio->io_size; + }