/*-
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
* $FreeBSD$
*/
#ifndef _SYS_VMMETER_H_
#define _SYS_VMMETER_H_
/*
* This value is used by ps(1) to change sleep state flag from 'S' to
* 'I' and by the sched process to set the alarm clock.
*/
#define MAXSLP 20
/*
* System wide statistics counters.
* Locking:
* a - locked by atomic operations
* c - constant after initialization
* f - locked by vm_page_queue_free_mtx
* p - locked by being in the PCPU and atomicity respect to interrupts
* q - changes are synchronized by the corresponding vm_pagequeue lock
*/
struct vmmeter {
/*
* General system activity.
*/
u_int v_swtch; /* (p) context switches */
u_int v_trap; /* (p) calls to trap */
u_int v_syscall; /* (p) calls to syscall() */
u_int v_intr; /* (p) device interrupts */
u_int v_soft; /* (p) software interrupts */
/*
* Virtual memory activity.
*/
u_int v_vm_faults; /* (p) address memory faults */
u_int v_io_faults; /* (p) page faults requiring I/O */
u_int v_cow_faults; /* (p) copy-on-writes faults */
u_int v_cow_optim; /* (p) optimized copy-on-writes faults */
u_int v_zfod; /* (p) pages zero filled on demand */
u_int v_ozfod; /* (p) optimized zero fill pages */
u_int v_swapin; /* (p) swap pager pageins */
u_int v_swapout; /* (p) swap pager pageouts */
u_int v_swappgsin; /* (p) swap pager pages paged in */
u_int v_swappgsout; /* (p) swap pager pages paged out */
u_int v_vnodein; /* (p) vnode pager pageins */
u_int v_vnodeout; /* (p) vnode pager pageouts */
u_int v_vnodepgsin; /* (p) vnode_pager pages paged in */
u_int v_vnodepgsout; /* (p) vnode pager pages paged out */
u_int v_intrans; /* (p) intransit blocking page faults */
u_int v_reactivated; /* (p) pages reactivated by the pagedaemon */
u_int v_pdwakeups; /* (p) times daemon has awaken from sleep */
u_int v_pdpages; /* (p) pages analyzed by daemon */
u_int v_pdshortfalls; /* (p) page reclamation shortfalls */
u_int v_dfree; /* (p) pages freed by daemon */
u_int v_pfree; /* (p) pages freed by exiting processes */
u_int v_tfree; /* (p) total pages freed */
/*
* Distribution of page usages.
*/
u_int v_page_size; /* (c) page size in bytes */
u_int v_page_count; /* (c) total number of pages in system */
u_int v_free_reserved; /* (c) pages reserved for deadlock */
u_int v_free_target; /* (c) pages desired free */
u_int v_free_min; /* (c) pages desired free */
u_int v_free_count; /* (f) pages free */
u_int v_wire_count; /* (a) pages wired down */
u_int v_active_count; /* (q) pages active */
u_int v_inactive_target; /* (c) pages desired inactive */
u_int v_inactive_count; /* (q) pages inactive */
u_int v_laundry_count; /* (q) pages eligible for laundering */
u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
u_int v_interrupt_free_min; /* (c) reserved pages for int code */
u_int v_free_severe; /* (c) severe page depletion point */
/*
* Fork/vfork/rfork activity.
*/
u_int v_forks; /* (p) fork() calls */
u_int v_vforks; /* (p) vfork() calls */
u_int v_rforks; /* (p) rfork() calls */
u_int v_kthreads; /* (p) fork() calls by kernel */
u_int v_forkpages; /* (p) VM pages affected by fork() */
u_int v_vforkpages; /* (p) VM pages affected by vfork() */
u_int v_rforkpages; /* (p) VM pages affected by rfork() */
u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */
};
#ifdef _KERNEL
extern struct vmmeter vm_cnt;
extern u_int vm_pageout_wakeup_thresh;
/*
* Return TRUE if we are under our severe low-free-pages threshold
*
* This routine is typically used at the user<->system interface to determine
* whether we need to block in order to avoid a low memory deadlock.
*/
static inline int
vm_page_count_severe(void)
{
return (vm_cnt.v_free_severe > vm_cnt.v_free_count);
}
/*
* Return TRUE if we are under our minimum low-free-pages threshold.
*
* This routine is typically used within the system to determine whether
* we can execute potentially very expensive code in terms of memory. It
* is also used by the pageout daemon to calculate when to sleep, when
* to wake waiters up, and when (after making a pass) to become more
* desperate.
*/
static inline int
vm_page_count_min(void)
{
return (vm_cnt.v_free_min > vm_cnt.v_free_count);
}
/*
* Return TRUE if we have not reached our free page target during
* free page recovery operations.
*/
static inline int
vm_page_count_target(void)
{
return (vm_cnt.v_free_target > vm_cnt.v_free_count);
}
/*
* Return the number of pages we need to free-up or cache
* A positive number indicates that we do not have enough free pages.
*/
static inline int
vm_paging_target(void)
{
return (vm_cnt.v_free_target - vm_cnt.v_free_count);
}
/*
* Returns TRUE if the pagedaemon needs to be woken up.
*/
static inline int
vm_paging_needed(void)
{
return (vm_cnt.v_free_count < vm_pageout_wakeup_thresh);
}
/*
* Return the number of pages we need to launder.
* A positive number indicates that we have a shortfall of clean pages.
*/
static inline int
vm_laundry_target(void)
{
return (vm_paging_target());
}
/*
* Obtain the value of a per-CPU counter.
*/
#define VM_METER_PCPU_CNT(member) \
vm_meter_cnt(__offsetof(struct vmmeter, member))
u_int vm_meter_cnt(size_t);
#endif
/* systemwide totals computed every five seconds */
struct vmtotal {
int16_t t_rq; /* length of the run queue */
int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
int16_t t_pw; /* jobs in page wait */
int16_t t_sl; /* jobs sleeping in core */
int16_t t_sw; /* swapped out runnable/short block jobs */
int32_t t_vm; /* total virtual memory */
int32_t t_avm; /* active virtual memory */
int32_t t_rm; /* total real memory in use */
int32_t t_arm; /* active real memory */
int32_t t_vmshr; /* shared virtual memory */
int32_t t_avmshr; /* active shared virtual memory */
int32_t t_rmshr; /* shared real memory */
int32_t t_armshr; /* active shared real memory */
int32_t t_free; /* free memory pages */
};
#endif
