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29 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
33 #ifndef _SYS_VMMETER_H_
34 #define _SYS_VMMETER_H_
37 * System wide statistics counters.
39 * a - locked by atomic operations
40 * c - constant after initialization
41 * f - locked by vm_page_queue_free_mtx
42 * p - locked by being in the PCPU and atomicity respect to interrupts
43 * q - locked by vm_page_queue_mtx
47 * General system activity.
49 u_int v_swtch; /* (p) context switches */
50 u_int v_trap; /* (p) calls to trap */
51 u_int v_syscall; /* (p) calls to syscall() */
52 u_int v_intr; /* (p) device interrupts */
53 u_int v_soft; /* (p) software interrupts */
55 * Virtual memory activity.
57 u_int v_vm_faults; /* (p) address memory faults */
58 u_int v_cow_faults; /* (p) copy-on-writes faults */
59 u_int v_cow_optim; /* (p) optimized copy-on-writes faults */
60 u_int v_zfod; /* (p) pages zero filled on demand */
61 u_int v_ozfod; /* (p) optimized zero fill pages */
62 u_int v_swapin; /* (p) swap pager pageins */
63 u_int v_swapout; /* (p) swap pager pageouts */
64 u_int v_swappgsin; /* (p) swap pager pages paged in */
65 u_int v_swappgsout; /* (p) swap pager pages paged out */
66 u_int v_vnodein; /* (p) vnode pager pageins */
67 u_int v_vnodeout; /* (p) vnode pager pageouts */
68 u_int v_vnodepgsin; /* (p) vnode_pager pages paged in */
69 u_int v_vnodepgsout; /* (p) vnode pager pages paged out */
70 u_int v_intrans; /* (p) intransit blocking page faults */
71 u_int v_reactivated; /* (f) pages reactivated from free list */
72 u_int v_pdwakeups; /* (f) times daemon has awaken from sleep */
73 u_int v_pdpages; /* (q) pages analyzed by daemon */
75 u_int v_tcached; /* (q) total pages cached */
76 u_int v_dfree; /* (q) pages freed by daemon */
77 u_int v_pfree; /* (q) pages freed by exiting processes */
78 u_int v_tfree; /* (p) total pages freed */
80 * Distribution of page usages.
82 u_int v_page_size; /* (c) page size in bytes */
83 u_int v_page_count; /* (c) total number of pages in system */
84 u_int v_free_reserved; /* (c) pages reserved for deadlock */
85 u_int v_free_target; /* (c) pages desired free */
86 u_int v_free_min; /* (c) pages desired free */
87 u_int v_free_count; /* (f) pages free */
88 u_int v_wire_count; /* (a) pages wired down */
89 u_int v_active_count; /* (q) pages active */
90 u_int v_inactive_target; /* (c) pages desired inactive */
91 u_int v_inactive_count; /* (q) pages inactive */
92 u_int v_cache_count; /* (f) pages on cache queue */
93 u_int v_cache_min; /* (c) min pages desired on cache queue */
94 u_int v_cache_max; /* (c) max pages in cached obj */
95 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
96 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
97 u_int v_free_severe; /* (c) severe page depletion point */
99 * Fork/vfork/rfork activity.
101 u_int v_forks; /* (p) fork() calls */
102 u_int v_vforks; /* (p) vfork() calls */
103 u_int v_rforks; /* (p) rfork() calls */
104 u_int v_kthreads; /* (p) fork() calls by kernel */
105 u_int v_forkpages; /* (p) VM pages affected by fork() */
106 u_int v_vforkpages; /* (p) VM pages affected by vfork() */
107 u_int v_rforkpages; /* (p) VM pages affected by rfork() */
108 u_int v_kthreadpages; /* (p) VM pages affected by fork() by kernel */
112 extern struct vmmeter cnt;
115 * Return TRUE if we are under our severe low-free-pages threshold
117 * This routine is typically used at the user<->system interface to determine
118 * whether we need to block in order to avoid a low memory deadlock.
123 vm_page_count_severe(void)
125 return (cnt.v_free_severe > (cnt.v_free_count + cnt.v_cache_count));
129 * Return TRUE if we are under our minimum low-free-pages threshold.
131 * This routine is typically used within the system to determine whether
132 * we can execute potentially very expensive code in terms of memory. It
133 * is also used by the pageout daemon to calculate when to sleep, when
134 * to wake waiters up, and when (after making a pass) to become more
140 vm_page_count_min(void)
142 return (cnt.v_free_min > (cnt.v_free_count + cnt.v_cache_count));
146 * Return TRUE if we have not reached our free page target during
147 * free page recovery operations.
152 vm_page_count_target(void)
154 return (cnt.v_free_target > (cnt.v_free_count + cnt.v_cache_count));
158 * Return the number of pages we need to free-up or cache
159 * A positive number indicates that we do not have enough free pages.
164 vm_paging_target(void)
167 (cnt.v_free_target + cnt.v_cache_min) -
168 (cnt.v_free_count + cnt.v_cache_count)
173 * Returns TRUE if the pagedaemon needs to be woken up.
178 vm_paging_needed(void)
181 (cnt.v_free_reserved + cnt.v_cache_min) >
182 (cnt.v_free_count + cnt.v_cache_count)
188 /* systemwide totals computed every five seconds */
190 int16_t t_rq; /* length of the run queue */
191 int16_t t_dw; /* jobs in ``disk wait'' (neg priority) */
192 int16_t t_pw; /* jobs in page wait */
193 int16_t t_sl; /* jobs sleeping in core */
194 int16_t t_sw; /* swapped out runnable/short block jobs */
195 int32_t t_vm; /* total virtual memory */
196 int32_t t_avm; /* active virtual memory */
197 int32_t t_rm; /* total real memory in use */
198 int32_t t_arm; /* active real memory */
199 int32_t t_vmshr; /* shared virtual memory */
200 int32_t t_avmshr; /* active shared virtual memory */
201 int32_t t_rmshr; /* shared real memory */
202 int32_t t_armshr; /* active shared real memory */
203 int32_t t_free; /* free memory pages */