summaryrefslogtreecommitdiffstats
path: root/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c
diff options
context:
space:
mode:
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c')
-rw-r--r--sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c323
1 files changed, 0 insertions, 323 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c b/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c
deleted file mode 100644
index 8ef524f..0000000
--- a/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_queue.c
+++ /dev/null
@@ -1,323 +0,0 @@
-/*
- * CDDL HEADER START
- *
- * The contents of this file are subject to the terms of the
- * Common Development and Distribution License (the "License").
- * You may not use this file except in compliance with the License.
- *
- * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
- * or http://www.opensolaris.org/os/licensing.
- * See the License for the specific language governing permissions
- * and limitations under the License.
- *
- * When distributing Covered Code, include this CDDL HEADER in each
- * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
- * If applicable, add the following below this CDDL HEADER, with the
- * fields enclosed by brackets "[]" replaced with your own identifying
- * information: Portions Copyright [yyyy] [name of copyright owner]
- *
- * CDDL HEADER END
- */
-/*
- * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
- * Use is subject to license terms.
- */
-
-#pragma ident "%Z%%M% %I% %E% SMI"
-
-#include <sys/zfs_context.h>
-#include <sys/spa.h>
-#include <sys/vdev_impl.h>
-#include <sys/zio.h>
-#include <sys/avl.h>
-
-/*
- * These tunables are for performance analysis.
- */
-/*
- * zfs_vdev_max_pending is the maximum number of i/os concurrently
- * pending to each device. zfs_vdev_min_pending is the initial number
- * of i/os pending to each device (before it starts ramping up to
- * max_pending).
- */
-int zfs_vdev_max_pending = 35;
-int zfs_vdev_min_pending = 4;
-
-/* deadline = pri + (LBOLT >> time_shift) */
-int zfs_vdev_time_shift = 6;
-
-/* exponential I/O issue ramp-up rate */
-int zfs_vdev_ramp_rate = 2;
-
-/*
- * i/os will be aggregated into a single large i/o up to
- * zfs_vdev_aggregation_limit bytes long.
- */
-int zfs_vdev_aggregation_limit = SPA_MAXBLOCKSIZE;
-
-/*
- * Virtual device vector for disk I/O scheduling.
- */
-int
-vdev_queue_deadline_compare(const void *x1, const void *x2)
-{
- const zio_t *z1 = x1;
- const zio_t *z2 = x2;
-
- if (z1->io_deadline < z2->io_deadline)
- return (-1);
- if (z1->io_deadline > z2->io_deadline)
- return (1);
-
- if (z1->io_offset < z2->io_offset)
- return (-1);
- if (z1->io_offset > z2->io_offset)
- return (1);
-
- if (z1 < z2)
- return (-1);
- if (z1 > z2)
- return (1);
-
- return (0);
-}
-
-int
-vdev_queue_offset_compare(const void *x1, const void *x2)
-{
- const zio_t *z1 = x1;
- const zio_t *z2 = x2;
-
- if (z1->io_offset < z2->io_offset)
- return (-1);
- if (z1->io_offset > z2->io_offset)
- return (1);
-
- if (z1 < z2)
- return (-1);
- if (z1 > z2)
- return (1);
-
- return (0);
-}
-
-void
-vdev_queue_init(vdev_t *vd)
-{
- vdev_queue_t *vq = &vd->vdev_queue;
-
- mutex_init(&vq->vq_lock, NULL, MUTEX_DEFAULT, NULL);
-
- avl_create(&vq->vq_deadline_tree, vdev_queue_deadline_compare,
- sizeof (zio_t), offsetof(struct zio, io_deadline_node));
-
- avl_create(&vq->vq_read_tree, vdev_queue_offset_compare,
- sizeof (zio_t), offsetof(struct zio, io_offset_node));
-
- avl_create(&vq->vq_write_tree, vdev_queue_offset_compare,
- sizeof (zio_t), offsetof(struct zio, io_offset_node));
-
- avl_create(&vq->vq_pending_tree, vdev_queue_offset_compare,
- sizeof (zio_t), offsetof(struct zio, io_offset_node));
-}
-
-void
-vdev_queue_fini(vdev_t *vd)
-{
- vdev_queue_t *vq = &vd->vdev_queue;
-
- avl_destroy(&vq->vq_deadline_tree);
- avl_destroy(&vq->vq_read_tree);
- avl_destroy(&vq->vq_write_tree);
- avl_destroy(&vq->vq_pending_tree);
-
- mutex_destroy(&vq->vq_lock);
-}
-
-static void
-vdev_queue_io_add(vdev_queue_t *vq, zio_t *zio)
-{
- avl_add(&vq->vq_deadline_tree, zio);
- avl_add(zio->io_vdev_tree, zio);
-}
-
-static void
-vdev_queue_io_remove(vdev_queue_t *vq, zio_t *zio)
-{
- avl_remove(&vq->vq_deadline_tree, zio);
- avl_remove(zio->io_vdev_tree, zio);
-}
-
-static void
-vdev_queue_agg_io_done(zio_t *aio)
-{
- zio_t *dio;
- uint64_t offset = 0;
-
- while ((dio = aio->io_delegate_list) != NULL) {
- if (aio->io_type == ZIO_TYPE_READ)
- bcopy((char *)aio->io_data + offset, dio->io_data,
- dio->io_size);
- offset += dio->io_size;
- aio->io_delegate_list = dio->io_delegate_next;
- dio->io_delegate_next = NULL;
- dio->io_error = aio->io_error;
- zio_next_stage(dio);
- }
- ASSERT3U(offset, ==, aio->io_size);
-
- zio_buf_free(aio->io_data, aio->io_size);
-}
-
-#define IS_ADJACENT(io, nio) \
- ((io)->io_offset + (io)->io_size == (nio)->io_offset)
-
-typedef void zio_issue_func_t(zio_t *);
-
-static zio_t *
-vdev_queue_io_to_issue(vdev_queue_t *vq, uint64_t pending_limit,
- zio_issue_func_t **funcp)
-{
- zio_t *fio, *lio, *aio, *dio;
- avl_tree_t *tree;
- uint64_t size;
-
- ASSERT(MUTEX_HELD(&vq->vq_lock));
-
- *funcp = NULL;
-
- if (avl_numnodes(&vq->vq_pending_tree) >= pending_limit ||
- avl_numnodes(&vq->vq_deadline_tree) == 0)
- return (NULL);
-
- fio = lio = avl_first(&vq->vq_deadline_tree);
-
- tree = fio->io_vdev_tree;
- size = fio->io_size;
-
- while ((dio = AVL_PREV(tree, fio)) != NULL && IS_ADJACENT(dio, fio) &&
- size + dio->io_size <= zfs_vdev_aggregation_limit) {
- dio->io_delegate_next = fio;
- fio = dio;
- size += dio->io_size;
- }
-
- while ((dio = AVL_NEXT(tree, lio)) != NULL && IS_ADJACENT(lio, dio) &&
- size + dio->io_size <= zfs_vdev_aggregation_limit) {
- lio->io_delegate_next = dio;
- lio = dio;
- size += dio->io_size;
- }
-
- if (fio != lio) {
- char *buf = zio_buf_alloc(size);
- uint64_t offset = 0;
- int nagg = 0;
-
- ASSERT(size <= zfs_vdev_aggregation_limit);
-
- aio = zio_vdev_child_io(fio, NULL, fio->io_vd,
- fio->io_offset, buf, size, fio->io_type,
- ZIO_PRIORITY_NOW, ZIO_FLAG_DONT_QUEUE |
- ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_PROPAGATE |
- ZIO_FLAG_NOBOOKMARK,
- vdev_queue_agg_io_done, NULL);
-
- aio->io_delegate_list = fio;
-
- for (dio = fio; dio != NULL; dio = dio->io_delegate_next) {
- ASSERT(dio->io_type == aio->io_type);
- ASSERT(dio->io_vdev_tree == tree);
- if (dio->io_type == ZIO_TYPE_WRITE)
- bcopy(dio->io_data, buf + offset, dio->io_size);
- offset += dio->io_size;
- vdev_queue_io_remove(vq, dio);
- zio_vdev_io_bypass(dio);
- nagg++;
- }
-
- ASSERT(offset == size);
-
- dprintf("%5s T=%llu off=%8llx agg=%3d "
- "old=%5llx new=%5llx\n",
- zio_type_name[fio->io_type],
- fio->io_deadline, fio->io_offset, nagg, fio->io_size, size);
-
- avl_add(&vq->vq_pending_tree, aio);
-
- *funcp = zio_nowait;
- return (aio);
- }
-
- ASSERT(fio->io_vdev_tree == tree);
- vdev_queue_io_remove(vq, fio);
-
- avl_add(&vq->vq_pending_tree, fio);
-
- *funcp = zio_next_stage;
-
- return (fio);
-}
-
-zio_t *
-vdev_queue_io(zio_t *zio)
-{
- vdev_queue_t *vq = &zio->io_vd->vdev_queue;
- zio_t *nio;
- zio_issue_func_t *func;
-
- ASSERT(zio->io_type == ZIO_TYPE_READ || zio->io_type == ZIO_TYPE_WRITE);
-
- if (zio->io_flags & ZIO_FLAG_DONT_QUEUE)
- return (zio);
-
- zio->io_flags |= ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_QUEUE;
-
- if (zio->io_type == ZIO_TYPE_READ)
- zio->io_vdev_tree = &vq->vq_read_tree;
- else
- zio->io_vdev_tree = &vq->vq_write_tree;
-
- mutex_enter(&vq->vq_lock);
-
- zio->io_deadline = (zio->io_timestamp >> zfs_vdev_time_shift) +
- zio->io_priority;
-
- vdev_queue_io_add(vq, zio);
-
- nio = vdev_queue_io_to_issue(vq, zfs_vdev_min_pending, &func);
-
- mutex_exit(&vq->vq_lock);
-
- if (nio == NULL || func != zio_nowait)
- return (nio);
-
- func(nio);
- return (NULL);
-}
-
-void
-vdev_queue_io_done(zio_t *zio)
-{
- vdev_queue_t *vq = &zio->io_vd->vdev_queue;
- zio_t *nio;
- zio_issue_func_t *func;
- int i;
-
- mutex_enter(&vq->vq_lock);
-
- avl_remove(&vq->vq_pending_tree, zio);
-
- for (i = 0; i < zfs_vdev_ramp_rate; i++) {
- nio = vdev_queue_io_to_issue(vq, zfs_vdev_max_pending, &func);
- if (nio == NULL)
- break;
- mutex_exit(&vq->vq_lock);
- if (func == zio_next_stage)
- zio_vdev_io_reissue(nio);
- func(nio);
- mutex_enter(&vq->vq_lock);
- }
-
- mutex_exit(&vq->vq_lock);
-}
OpenPOWER on IntegriCloud