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ea400129c3
- Avoid atomic_add() when updating as_lower_bound/as_upper_bound. Previous code was excessively strong on 64bit systems while not strong enough on 32bit ones. Instead introduce and use real atomic_load() and atomic_store() operations, just an assignments on 64bit machines, but using proper atomics on 32bit ones to avoid torn reads/writes. - Reduce number of buckets on large systems. Extra buckets not as much improve add speed, as hurt reads. Unlike wmsum for aggsum reads are still important. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Ryan Moeller <ryan@iXsystems.com> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored-By: iXsystems, Inc. Closes #12145
83 lines
3.5 KiB
C
83 lines
3.5 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _SPL_ATOMIC_H
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#define _SPL_ATOMIC_H
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <sys/types.h>
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/*
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* Map the atomic_* functions to the Linux counterparts. This relies on the
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* fact that the atomic types are internally really a uint32 or uint64. If
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* this were to change an alternate approach would be needed.
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*
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* N.B. Due to the limitations of the original API atomicity is not strictly
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* preserved when using the 64-bit functions on a 32-bit system. In order
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* to support this all consumers would need to be updated to use the Linux
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* provided atomic_t and atomic64_t types.
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*/
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#define atomic_inc_32(v) atomic_inc((atomic_t *)(v))
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#define atomic_dec_32(v) atomic_dec((atomic_t *)(v))
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#define atomic_add_32(v, i) atomic_add((i), (atomic_t *)(v))
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#define atomic_sub_32(v, i) atomic_sub((i), (atomic_t *)(v))
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#define atomic_inc_32_nv(v) atomic_inc_return((atomic_t *)(v))
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#define atomic_dec_32_nv(v) atomic_dec_return((atomic_t *)(v))
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#define atomic_add_32_nv(v, i) atomic_add_return((i), (atomic_t *)(v))
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#define atomic_sub_32_nv(v, i) atomic_sub_return((i), (atomic_t *)(v))
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#define atomic_cas_32(v, x, y) atomic_cmpxchg((atomic_t *)(v), x, y)
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#define atomic_swap_32(v, x) atomic_xchg((atomic_t *)(v), x)
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#define atomic_load_32(v) atomic_read((atomic_t *)(v))
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#define atomic_store_32(v, x) atomic_set((atomic_t *)(v), x)
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#define atomic_inc_64(v) atomic64_inc((atomic64_t *)(v))
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#define atomic_dec_64(v) atomic64_dec((atomic64_t *)(v))
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#define atomic_add_64(v, i) atomic64_add((i), (atomic64_t *)(v))
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#define atomic_sub_64(v, i) atomic64_sub((i), (atomic64_t *)(v))
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#define atomic_inc_64_nv(v) atomic64_inc_return((atomic64_t *)(v))
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#define atomic_dec_64_nv(v) atomic64_dec_return((atomic64_t *)(v))
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#define atomic_add_64_nv(v, i) atomic64_add_return((i), (atomic64_t *)(v))
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#define atomic_sub_64_nv(v, i) atomic64_sub_return((i), (atomic64_t *)(v))
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#define atomic_cas_64(v, x, y) atomic64_cmpxchg((atomic64_t *)(v), x, y)
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#define atomic_swap_64(v, x) atomic64_xchg((atomic64_t *)(v), x)
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#define atomic_load_64(v) atomic64_read((atomic64_t *)(v))
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#define atomic_store_64(v, x) atomic64_set((atomic64_t *)(v), x)
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#ifdef _LP64
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static __inline__ void *
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atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
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{
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return ((void *)atomic_cas_64((volatile uint64_t *)target,
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(uint64_t)cmp, (uint64_t)newval));
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}
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#else /* _LP64 */
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static __inline__ void *
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atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
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{
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return ((void *)atomic_cas_32((volatile uint32_t *)target,
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(uint32_t)cmp, (uint32_t)newval));
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}
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#endif /* _LP64 */
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#endif /* _SPL_ATOMIC_H */
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