5b1a8eb397
Keep track of time spent by the cpu in various contexts in units of "cputicks" and scale to real-world microsec^H^H^H^H^H^H^H^Hclock_t only when somebody wants to inspect the numbers. For now "cputicks" are still derived from the current timecounter and therefore things should by definition remain sensible also on SMP machines. (The main reason for this first milestone commit is to verify that hypothesis.) On slower machines, the avoided multiplications to normalize timestams at every context switch, comes out as a 5-7% better score on the unixbench/context1 microbenchmark. On more modern hardware no change in performance is seen.
118 lines
4.1 KiB
C
118 lines
4.1 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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#ifndef _KERNEL
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#error "no user-serviceable parts inside"
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#endif
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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/queue.h>
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#include <sys/vmmeter.h>
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#include <machine/pcpu.h>
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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 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;
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int pc_switchticks;
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u_int pc_cpuid; /* This cpu number */
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cpumask_t pc_cpumask; /* This cpu mask */
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cpumask_t 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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struct device *pc_device;
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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 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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/*
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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 atomicity 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 /* !_SYS_PCPU_H_ */
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