1614716655
Due to the way rtld creates mappings for the shared objects, each dso causes unmap of at least three guard map entries. For instance, in the buildworld load, this change reduces the amount of pmap_remove() calls by 1/5. Profiled by: alc Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D16148
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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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extern struct pcpu __pcpu[];
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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((uint64_t *)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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*((uint64_t *)((char *)arg + UMA_PCPU_ALLOC_SIZE *
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PCPU_GET(cpuid))) = 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, i) counter_u64_add(c, i)
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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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__asm __volatile("addq\t%1,%%gs:(%0)"
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:
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: "r" ((char *)c - (char *)&__pcpu[0]), "ri" (inc)
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: "memory", "cc");
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}
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#endif /* ! __MACHINE_COUNTER_H__ */
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