f7cc0eae7e
Prefer atomics to critical section. This reduces the cost of the increment operation and removes the possibility of it being interrupted by counter_u64_zero(). Use CPU_FOREACH() macro to skip absent CPUs. Replace hand-rolled address calculation with zpcpu_get(). Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D27536
87 lines
2.4 KiB
C
87 lines
2.4 KiB
C
/*-
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* Copyright (c) 2012 Konstantin Belousov <kib@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_COUNTER_H_
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#define _MACHINE_COUNTER_H_
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#include <sys/pcpu.h>
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#include <machine/atomic.h>
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#define EARLY_COUNTER &__pcpu[0].pc_early_dummy_counter
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#define counter_enter() do {} while (0)
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#define counter_exit() do {} while (0)
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#ifdef IN_SUBR_COUNTER_C
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static inline uint64_t
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counter_u64_read_one(uint64_t *p, int cpu)
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{
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return (*(uint64_t *)((char *)p + UMA_PCPU_ALLOC_SIZE * cpu));
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}
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static inline uint64_t
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counter_u64_fetch_inline(uint64_t *p)
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{
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uint64_t r;
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int i;
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r = 0;
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CPU_FOREACH(i)
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r += counter_u64_read_one(p, i);
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return (r);
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}
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static void
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counter_u64_zero_one_cpu(void *arg)
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{
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*(zpcpu_get((counter_u64_t *)arg)) = 0;
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}
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static inline void
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counter_u64_zero_inline(counter_u64_t c)
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{
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smp_rendezvous(smp_no_rendezvous_barrier, counter_u64_zero_one_cpu,
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smp_no_rendezvous_barrier, c);
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}
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#endif
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#define counter_u64_add_protected(c, inc) counter_u64_add(c, inc)
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static inline void
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counter_u64_add(counter_u64_t c, int64_t inc)
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{
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atomic_add_64((uint64_t *)zpcpu_get(c), inc);
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}
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#endif /* ! _MACHINE_COUNTER_H_ */
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