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80f5c8bf42
PCPU_LAZY_INC() which increments elements in it for cases where we can afford the occassional inaccuracy. Use of per-cpu stats counters avoids significant cache stalls in various critical paths that would otherwise severely limit our cpu scaleability. Adjust all sysctl's accessing cnt.* elements to now use a procedure which aggregates the requested field for all cpus and for the global vmmeter. The global vmmeter is retained, since some stats counters, like v_free_min, cannot be made per-cpu. Also, this allows us to convert counters from the global vmmeter to the per-cpu vmmeter in a piecemeal fashion, so have at it!
113 lines
4 KiB
C
113 lines
4 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 _KERNEL
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#include <sys/queue.h>
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#include <sys/vmmeter.h>
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#include <machine/pcpu.h>
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#ifndef LOCORE
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struct pcb;
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struct thread;
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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 pcb *pc_curpcb; /* Current pcb */
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struct bintime pc_switchtime;
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int pc_switchticks;
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u_int pc_cpuid; /* This cpu number */
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u_int pc_cpumask; /* This cpu mask */
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u_int pc_other_cpus; /* Mask of all other cpus */
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SLIST_ENTRY(pcpu) pc_allcpu;
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struct lock_list_entry *pc_spinlocks;
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#ifdef KTR_PERCPU
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int pc_ktr_idx; /* Index into trace table */
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char *pc_ktr_buf;
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#endif
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PCPU_MD_FIELDS;
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struct vmmeter pc_cnt; /* VM stats counters */
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};
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SLIST_HEAD(cpuhead, pcpu);
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extern struct cpuhead cpuhead;
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#define curthread PCPU_GET(curthread)
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#define CURPROC (curthread->td_proc)
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#define curproc (curthread->td_proc)
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#define curksegrp (curthread->td_ksegrp)
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#define curkse (curthread->td_kse)
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/*
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* MI PCPU support functions
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*
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* PCPU_LAZY_INC() - Lazily increment a per-cpu stats counter, without
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* guarenteeing atomicy or even necessarily consistency.
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*
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* XXX we need to create MD primitives to support
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* this to guarentee at least some level of consistency,
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* i.e. to prevent us from totally corrupting the
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* counters due to preemption in a multi-instruction
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* increment sequence for architectures that do not
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* support single-instruction memory increments.
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*/
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#define PCPU_LAZY_INC(var) (++*PCPU_PTR(var))
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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 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 /* !LOCORE */
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#endif /* _KERNEL */
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#endif /* _SYS_PCPU_H_ */
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