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d057807ede
With large number of tracked references list searches under the lock become too expensive, creating enormous lock contention. On my tests with ZFS_DEBUG enabled this increases write throughput with 32KB blocks from ~1.2GB/s to ~7.5GB/s. Reviewed-by: Brian Atkinson <batkinson@lanl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #14970
145 lines
4.9 KiB
C
145 lines
4.9 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2012, 2015 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_ZFS_REFCOUNT_H
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#define _SYS_ZFS_REFCOUNT_H
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#include <sys/inttypes.h>
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#include <sys/avl.h>
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#include <sys/list.h>
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#include <sys/zfs_context.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* If the reference is held only by the calling function and not any
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* particular object, use FTAG (which is a string) for the holder_tag.
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* Otherwise, use the object that holds the reference.
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*/
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#define FTAG ((char *)(uintptr_t)__func__)
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#ifdef ZFS_DEBUG
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typedef struct reference {
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union {
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avl_node_t a;
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list_node_t l;
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} ref_link;
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const void *ref_holder;
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uint64_t ref_number;
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boolean_t ref_search;
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} reference_t;
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typedef struct refcount {
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uint64_t rc_count;
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kmutex_t rc_mtx;
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avl_tree_t rc_tree;
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list_t rc_removed;
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uint_t rc_removed_count;
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boolean_t rc_tracked;
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} zfs_refcount_t;
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/*
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* Note: zfs_refcount_t must be initialized with
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* refcount_create[_untracked]()
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*/
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void zfs_refcount_create(zfs_refcount_t *);
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void zfs_refcount_create_untracked(zfs_refcount_t *);
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void zfs_refcount_create_tracked(zfs_refcount_t *);
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void zfs_refcount_destroy(zfs_refcount_t *);
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void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t);
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int zfs_refcount_is_zero(zfs_refcount_t *);
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int64_t zfs_refcount_count(zfs_refcount_t *);
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int64_t zfs_refcount_add(zfs_refcount_t *, const void *);
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int64_t zfs_refcount_remove(zfs_refcount_t *, const void *);
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/*
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* Note that (add|remove)_many adds/removes one reference with "number" N,
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* _not_ N references with "number" 1, which is what (add|remove)_few does,
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* or what vanilla zfs_refcount_(add|remove) called N times would do.
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*
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* Attempting to remove a reference with number N when none exists is a
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* panic on debug kernels with reference_tracking enabled.
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*/
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void zfs_refcount_add_few(zfs_refcount_t *, uint64_t, const void *);
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void zfs_refcount_remove_few(zfs_refcount_t *, uint64_t, const void *);
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int64_t zfs_refcount_add_many(zfs_refcount_t *, uint64_t, const void *);
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int64_t zfs_refcount_remove_many(zfs_refcount_t *, uint64_t, const void *);
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void zfs_refcount_transfer(zfs_refcount_t *, zfs_refcount_t *);
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void zfs_refcount_transfer_ownership(zfs_refcount_t *, const void *,
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const void *);
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void zfs_refcount_transfer_ownership_many(zfs_refcount_t *, uint64_t,
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const void *, const void *);
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boolean_t zfs_refcount_held(zfs_refcount_t *, const void *);
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boolean_t zfs_refcount_not_held(zfs_refcount_t *, const void *);
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void zfs_refcount_init(void);
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void zfs_refcount_fini(void);
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#else /* ZFS_DEBUG */
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typedef struct refcount {
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uint64_t rc_count;
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} zfs_refcount_t;
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#define zfs_refcount_create(rc) ((rc)->rc_count = 0)
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#define zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0)
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#define zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0)
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#define zfs_refcount_destroy(rc) ((rc)->rc_count = 0)
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#define zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
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#define zfs_refcount_is_zero(rc) (zfs_refcount_count(rc) == 0)
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#define zfs_refcount_count(rc) atomic_load_64(&(rc)->rc_count)
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#define zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
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#define zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
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#define zfs_refcount_add_few(rc, number, holder) \
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atomic_add_64(&(rc)->rc_count, number)
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#define zfs_refcount_remove_few(rc, number, holder) \
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atomic_add_64(&(rc)->rc_count, -number)
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#define zfs_refcount_add_many(rc, number, holder) \
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atomic_add_64_nv(&(rc)->rc_count, number)
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#define zfs_refcount_remove_many(rc, number, holder) \
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atomic_add_64_nv(&(rc)->rc_count, -number)
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#define zfs_refcount_transfer(dst, src) { \
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uint64_t __tmp = zfs_refcount_count(src); \
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atomic_add_64(&(src)->rc_count, -__tmp); \
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atomic_add_64(&(dst)->rc_count, __tmp); \
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}
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#define zfs_refcount_transfer_ownership(rc, ch, nh) ((void)0)
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#define zfs_refcount_transfer_ownership_many(rc, nr, ch, nh) ((void)0)
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#define zfs_refcount_held(rc, holder) (zfs_refcount_count(rc) > 0)
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#define zfs_refcount_not_held(rc, holder) (B_TRUE)
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#define zfs_refcount_init()
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#define zfs_refcount_fini()
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#endif /* ZFS_DEBUG */
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_REFCOUNT_H */
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