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31 * @(#)vmmeter.h 8.2 (Berkeley) 7/10/94
35 #ifndef _SYS_VMMETER_H_
36 #define _SYS_VMMETER_H_
39 * This value is used by ps(1) to change sleep state flag from 'S' to
40 * 'I' and by the sched process to set the alarm clock.
45 uint64_t t_vm; /* total virtual memory */
46 uint64_t t_avm; /* active virtual memory */
47 uint64_t t_rm; /* total real memory in use */
48 uint64_t t_arm; /* active real memory */
49 uint64_t t_vmshr; /* shared virtual memory */
50 uint64_t t_avmshr; /* active shared virtual memory */
51 uint64_t t_rmshr; /* shared real memory */
52 uint64_t t_armshr; /* active shared real memory */
53 uint64_t t_free; /* free memory pages */
54 int16_t t_rq; /* length of the run queue */
55 int16_t t_dw; /* threads in ``disk wait'' (neg
57 int16_t t_pw; /* threads in page wait */
58 int16_t t_sl; /* threads sleeping in core */
59 int16_t t_sw; /* swapped out runnable/short
64 #if defined(_KERNEL) || defined(_WANT_VMMETER)
65 #include <sys/counter.h>
68 #define VMMETER_ALIGNED __aligned(CACHE_LINE_SIZE)
70 #define VMMETER_ALIGNED
74 * System wide statistics counters.
76 * a - locked by atomic operations
77 * c - constant after initialization
78 * f - locked by vm_page_queue_free_mtx
80 * q - changes are synchronized by the corresponding vm_pagequeue lock
84 * General system activity.
86 counter_u64_t v_swtch; /* (p) context switches */
87 counter_u64_t v_trap; /* (p) calls to trap */
88 counter_u64_t v_syscall; /* (p) calls to syscall() */
89 counter_u64_t v_intr; /* (p) device interrupts */
90 counter_u64_t v_soft; /* (p) software interrupts */
92 * Virtual memory activity.
94 counter_u64_t v_vm_faults; /* (p) address memory faults */
95 counter_u64_t v_io_faults; /* (p) page faults requiring I/O */
96 counter_u64_t v_cow_faults; /* (p) copy-on-writes faults */
97 counter_u64_t v_cow_optim; /* (p) optimized COW faults */
98 counter_u64_t v_zfod; /* (p) pages zero filled on demand */
99 counter_u64_t v_ozfod; /* (p) optimized zero fill pages */
100 counter_u64_t v_swapin; /* (p) swap pager pageins */
101 counter_u64_t v_swapout; /* (p) swap pager pageouts */
102 counter_u64_t v_swappgsin; /* (p) swap pager pages paged in */
103 counter_u64_t v_swappgsout; /* (p) swap pager pages paged out */
104 counter_u64_t v_vnodein; /* (p) vnode pager pageins */
105 counter_u64_t v_vnodeout; /* (p) vnode pager pageouts */
106 counter_u64_t v_vnodepgsin; /* (p) vnode_pager pages paged in */
107 counter_u64_t v_vnodepgsout; /* (p) vnode pager pages paged out */
108 counter_u64_t v_intrans; /* (p) intransit blocking page faults */
109 counter_u64_t v_reactivated; /* (p) reactivated by the pagedaemon */
110 counter_u64_t v_pdwakeups; /* (p) times daemon has awaken */
111 counter_u64_t v_pdpages; /* (p) pages analyzed by daemon */
112 counter_u64_t v_pdshortfalls; /* (p) page reclamation shortfalls */
114 counter_u64_t v_dfree; /* (p) pages freed by daemon */
115 counter_u64_t v_pfree; /* (p) pages freed by processes */
116 counter_u64_t v_tfree; /* (p) total pages freed */
118 * Fork/vfork/rfork activity.
120 counter_u64_t v_forks; /* (p) fork() calls */
121 counter_u64_t v_vforks; /* (p) vfork() calls */
122 counter_u64_t v_rforks; /* (p) rfork() calls */
123 counter_u64_t v_kthreads; /* (p) fork() calls by kernel */
124 counter_u64_t v_forkpages; /* (p) pages affected by fork() */
125 counter_u64_t v_vforkpages; /* (p) pages affected by vfork() */
126 counter_u64_t v_rforkpages; /* (p) pages affected by rfork() */
127 counter_u64_t v_kthreadpages; /* (p) ... and by kernel fork() */
128 #define VM_METER_NCOUNTERS \
129 (offsetof(struct vmmeter, v_page_size) / sizeof(counter_u64_t))
131 * Distribution of page usages.
133 u_int v_page_size; /* (c) page size in bytes */
134 u_int v_page_count; /* (c) total number of pages in system */
135 u_int v_free_reserved; /* (c) pages reserved for deadlock */
136 u_int v_free_target; /* (c) pages desired free */
137 u_int v_free_min; /* (c) pages desired free */
138 u_int v_inactive_target; /* (c) pages desired inactive */
139 u_int v_pageout_free_min; /* (c) min pages reserved for kernel */
140 u_int v_interrupt_free_min; /* (c) reserved pages for int code */
141 u_int v_free_severe; /* (c) severe page depletion point */
142 u_int v_wire_count VMMETER_ALIGNED; /* (a) pages wired down */
143 u_int v_active_count VMMETER_ALIGNED; /* (a) pages active */
144 u_int v_inactive_count VMMETER_ALIGNED; /* (a) pages inactive */
145 u_int v_laundry_count VMMETER_ALIGNED; /* (a) pages eligible for
147 u_int v_free_count VMMETER_ALIGNED; /* (f) pages free */
149 #endif /* _KERNEL || _WANT_VMMETER */
153 extern struct vmmeter vm_cnt;
154 extern u_int vm_pageout_wakeup_thresh;
156 #define VM_CNT_ADD(var, x) counter_u64_add(vm_cnt.var, x)
157 #define VM_CNT_INC(var) VM_CNT_ADD(var, 1)
158 #define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var)
161 * Return TRUE if we are under our severe low-free-pages threshold
163 * This routine is typically used at the user<->system interface to determine
164 * whether we need to block in order to avoid a low memory deadlock.
167 vm_page_count_severe(void)
170 return (vm_cnt.v_free_severe > vm_cnt.v_free_count);
174 * Return TRUE if we are under our minimum low-free-pages threshold.
176 * This routine is typically used within the system to determine whether
177 * we can execute potentially very expensive code in terms of memory. It
178 * is also used by the pageout daemon to calculate when to sleep, when
179 * to wake waiters up, and when (after making a pass) to become more
183 vm_page_count_min(void)
186 return (vm_cnt.v_free_min > vm_cnt.v_free_count);
190 * Return TRUE if we have not reached our free page target during
191 * free page recovery operations.
194 vm_page_count_target(void)
197 return (vm_cnt.v_free_target > vm_cnt.v_free_count);
201 * Return the number of pages we need to free-up or cache
202 * A positive number indicates that we do not have enough free pages.
205 vm_paging_target(void)
208 return (vm_cnt.v_free_target - vm_cnt.v_free_count);
212 * Returns TRUE if the pagedaemon needs to be woken up.
215 vm_paging_needed(u_int free_count)
218 return (free_count < vm_pageout_wakeup_thresh);
222 * Return the number of pages we need to launder.
223 * A positive number indicates that we have a shortfall of clean pages.
226 vm_laundry_target(void)
229 return (vm_paging_target());
232 #endif /* _SYS_VMMETER_H_ */