c25fabea97
This was added in r51337 as part of the implementation of madvise(MADV_DONTNEED). Its objective was to ensure that the page daemon would eventually reclaim other unreferenced pages (i.e., unreferenced pages not touched by madvise()) from the active queue. Now that the pagedaemon performs steady scanning of the active page queue, this weighted handling is unnecessary. Instead, always "cache" clean pages by moving them to the head of the inactive page queue. This simplifies the implementation of vm_page_advise() and eliminates the fragmentation that resulted from the distribution of pages among multiple queues. Suggested by: alc Reviewed by: alc Sponsored by: EMC / Isilon Storage Division Differential Revision: https://reviews.freebsd.org/D3401
240 lines
7.1 KiB
C
240 lines
7.1 KiB
C
/*-
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* Copyright (c) 2001 Wind River Systems, Inc.
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* All rights reserved.
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* Written by: John Baldwin <jhb@FreeBSD.org>
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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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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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 _SYS_PCPU_H_
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#define _SYS_PCPU_H_
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#ifdef LOCORE
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#error "no assembler-serviceable parts inside"
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#endif
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#include <sys/_cpuset.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/_sx.h>
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#include <sys/queue.h>
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#include <sys/_rmlock.h>
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#include <sys/vmmeter.h>
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#include <sys/resource.h>
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#include <machine/pcpu.h>
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#define DPCPU_SETNAME "set_pcpu"
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#define DPCPU_SYMPREFIX "pcpu_entry_"
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#ifdef _KERNEL
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/*
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* Define a set for pcpu data.
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*/
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extern uintptr_t *__start_set_pcpu;
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__GLOBL(__start_set_pcpu);
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extern uintptr_t *__stop_set_pcpu;
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__GLOBL(__stop_set_pcpu);
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/*
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* Array of dynamic pcpu base offsets. Indexed by id.
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*/
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extern uintptr_t dpcpu_off[];
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/*
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* Convenience defines.
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*/
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#define DPCPU_START ((uintptr_t)&__start_set_pcpu)
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#define DPCPU_STOP ((uintptr_t)&__stop_set_pcpu)
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#define DPCPU_BYTES (DPCPU_STOP - DPCPU_START)
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#define DPCPU_MODMIN 2048
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#define DPCPU_SIZE roundup2(DPCPU_BYTES, PAGE_SIZE)
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#define DPCPU_MODSIZE (DPCPU_SIZE - (DPCPU_BYTES - DPCPU_MODMIN))
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/*
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* Declaration and definition.
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*/
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#define DPCPU_NAME(n) pcpu_entry_##n
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#define DPCPU_DECLARE(t, n) extern t DPCPU_NAME(n)
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#define DPCPU_DEFINE(t, n) t DPCPU_NAME(n) __section(DPCPU_SETNAME) __used
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/*
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* Accessors with a given base.
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*/
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#define _DPCPU_PTR(b, n) \
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(__typeof(DPCPU_NAME(n))*)((b) + (uintptr_t)&DPCPU_NAME(n))
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#define _DPCPU_GET(b, n) (*_DPCPU_PTR(b, n))
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#define _DPCPU_SET(b, n, v) (*_DPCPU_PTR(b, n) = v)
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/*
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* Accessors for the current cpu.
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*/
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#define DPCPU_PTR(n) _DPCPU_PTR(PCPU_GET(dynamic), n)
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#define DPCPU_GET(n) (*DPCPU_PTR(n))
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#define DPCPU_SET(n, v) (*DPCPU_PTR(n) = v)
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/*
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* Accessors for remote cpus.
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*/
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#define DPCPU_ID_PTR(i, n) _DPCPU_PTR(dpcpu_off[(i)], n)
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#define DPCPU_ID_GET(i, n) (*DPCPU_ID_PTR(i, n))
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#define DPCPU_ID_SET(i, n, v) (*DPCPU_ID_PTR(i, n) = v)
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/*
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* Utility macros.
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*/
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#define DPCPU_SUM(n) __extension__ \
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({ \
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u_int _i; \
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__typeof(*DPCPU_PTR(n)) sum; \
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\
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sum = 0; \
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CPU_FOREACH(_i) { \
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sum += *DPCPU_ID_PTR(_i, n); \
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} \
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sum; \
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})
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#define DPCPU_VARSUM(n, var) __extension__ \
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({ \
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u_int _i; \
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__typeof((DPCPU_PTR(n))->var) sum; \
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\
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sum = 0; \
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CPU_FOREACH(_i) { \
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sum += (DPCPU_ID_PTR(_i, n))->var; \
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} \
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sum; \
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})
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#define DPCPU_ZERO(n) do { \
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u_int _i; \
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\
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CPU_FOREACH(_i) { \
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bzero(DPCPU_ID_PTR(_i, n), sizeof(*DPCPU_PTR(n))); \
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} \
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} while(0)
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#endif /* _KERNEL */
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/*
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* This structure maps out the global data that needs to be kept on a
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* per-cpu basis. The members are accessed via the PCPU_GET/SET/PTR
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* macros defined in <machine/pcpu.h>. Machine dependent fields are
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* defined in the PCPU_MD_FIELDS macro defined in <machine/pcpu.h>.
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*/
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struct pcpu {
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struct thread *pc_curthread; /* Current thread */
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struct thread *pc_idlethread; /* Idle thread */
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struct thread *pc_fpcurthread; /* Fp state owner */
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struct thread *pc_deadthread; /* Zombie thread or NULL */
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struct pcb *pc_curpcb; /* Current pcb */
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uint64_t pc_switchtime; /* cpu_ticks() at last csw */
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int pc_switchticks; /* `ticks' at last csw */
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u_int pc_cpuid; /* This cpu number */
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STAILQ_ENTRY(pcpu) pc_allcpu;
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struct lock_list_entry *pc_spinlocks;
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struct vmmeter pc_cnt; /* VM stats counters */
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long pc_cp_time[CPUSTATES]; /* statclock ticks */
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struct device *pc_device;
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void *pc_netisr; /* netisr SWI cookie */
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int pc_unused1; /* unused field */
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int pc_domain; /* Memory domain. */
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struct rm_queue pc_rm_queue; /* rmlock list of trackers */
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uintptr_t pc_dynamic; /* Dynamic per-cpu data area */
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/*
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* Keep MD fields last, so that CPU-specific variations on a
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* single architecture don't result in offset variations of
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* the machine-independent fields of the pcpu. Even though
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* the pcpu structure is private to the kernel, some ports
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* (e.g., lsof, part of gtop) define _KERNEL and include this
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* header. While strictly speaking this is wrong, there's no
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* reason not to keep the offsets of the MI fields constant
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* if only to make kernel debugging easier.
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*/
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PCPU_MD_FIELDS;
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} __aligned(CACHE_LINE_SIZE);
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#ifdef CTASSERT
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/*
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* To minimize memory waste in per-cpu UMA zones, size of struct pcpu
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* should be denominator of PAGE_SIZE.
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*/
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CTASSERT((PAGE_SIZE / sizeof(struct pcpu)) * sizeof(struct pcpu) == PAGE_SIZE);
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#endif
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#ifdef _KERNEL
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STAILQ_HEAD(cpuhead, pcpu);
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extern struct cpuhead cpuhead;
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extern struct pcpu *cpuid_to_pcpu[];
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#define curcpu PCPU_GET(cpuid)
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#define curproc (curthread->td_proc)
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#ifndef curthread
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#define curthread PCPU_GET(curthread)
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#endif
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#define curvidata PCPU_GET(vidata)
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/* Accessor to elements allocated via UMA_ZONE_PCPU zone. */
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static inline void *
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zpcpu_get(void *base)
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{
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return ((char *)(base) + sizeof(struct pcpu) * curcpu);
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}
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static inline void *
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zpcpu_get_cpu(void *base, int cpu)
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{
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return ((char *)(base) + sizeof(struct pcpu) * cpu);
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}
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/*
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* Machine dependent callouts. cpu_pcpu_init() is responsible for
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* initializing machine dependent fields of struct pcpu, and
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* db_show_mdpcpu() is responsible for handling machine dependent
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* fields for the DDB 'show pcpu' command.
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*/
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void cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
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void db_show_mdpcpu(struct pcpu *pcpu);
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void *dpcpu_alloc(int size);
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void dpcpu_copy(void *s, int size);
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void dpcpu_free(void *s, int size);
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void dpcpu_init(void *dpcpu, int cpuid);
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void pcpu_destroy(struct pcpu *pcpu);
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struct pcpu *pcpu_find(u_int cpuid);
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void pcpu_init(struct pcpu *pcpu, int cpuid, size_t size);
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#endif /* _KERNEL */
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#endif /* !_SYS_PCPU_H_ */
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