/* $OpenBSD: uvmexp.h,v 1.27 2026/03/08 17:06:10 deraadt Exp $ */

#ifndef _UVM_UVMEXP_

#define _UVM_UVMEXP_

/*

* CTL_VM identifiers

*/

#define VM_METER 1 /* struct vmmeter */

#define VM_LOADAVG 2 /* struct loadavg */

#define VM_PSSTRINGS 3 /* PSSTRINGS */

#define VM_UVMEXP 4 /* struct uvmexp */

#define VM_SWAPENCRYPT 5 /* int */

#define VM_NKMEMPAGES 6 /* int - # kmem_map pages */

#define VM_ANONMIN 7

#define VM_VTEXTMIN 8

#define VM_VNODEMIN 9

#define VM_MAXSLP 10

#define VM_USPACE 11

#define VM_MALLOC_CONF 12 /* config for userland malloc */

#define VM_MAXID 13 /* number of valid vm ids */

#define CTL_VM_NAMES { \

{ 0, 0 }, \

{ "vmmeter", CTLTYPE_STRUCT }, \

{ "loadavg", CTLTYPE_STRUCT }, \

{ "psstrings", CTLTYPE_STRUCT }, \

{ "uvmexp", CTLTYPE_STRUCT }, \

{ "swapencrypt", CTLTYPE_NODE }, \

{ "nkmempages", CTLTYPE_INT }, \

{ "anonmin", CTLTYPE_INT }, \

{ "vtextmin", CTLTYPE_INT }, \

{ "vnodemin", CTLTYPE_INT }, \

{ "maxslp", CTLTYPE_INT }, \

{ "uspace", CTLTYPE_INT }, \

{ "malloc_conf", CTLTYPE_STRING }, \

}

/*

* uvmexp: global data structures that are exported to parts of the kernel

* other than the vm system.

*

* Locks used to protect struct members in this file:

* a atomic operations (signed int, so use atomic_load_sint)

* I immutable after creation

* K kernel lock

* F uvm_lock_fpageq

* L uvm_lock_pageq

* S uvm_swap_data_lock

* p copy of per-CPU counters, used only by userland.

* o updated only by the page daemon

*/

struct uvmexp {

/* vm_page constants */

int pagesize; /* size of a page (PAGE_SIZE): must be power of 2 */

int pagemask; /* page mask */

int pageshift; /* page shift */

/* vm_page counters */

int npages; /* [I] number of pages we manage */

int free; /* [aF] number of free pages */

int active; /* [aL] # of active pages */

int inactive; /* [aL] # of pages that we free'd but may want back */

int paging; /* [a] # number of pages in the process of being paged out */

int wired; /* [a] # number of wired pages */

int zeropages; /* [aF] number of zero'd pages */

int reserve_pagedaemon; /* [I] # of pages reserved for pagedaemon */

int reserve_kernel; /* [I] # of pages reserved for kernel */

int percpucaches; /* [a] # of pages in per-CPU caches */

int vnodepages; /* XXX # of pages used by vnode page cache */

int vtextpages; /* XXX # of pages used by vtext vnodes */

/* pageout params */

int freemin; /* [I] min number of free pages */

int freetarg; /* [I] target number of free pages */

int inactarg; /* target number of inactive pages */

int wiredmax; /* [I] max number of wired pages */

int anonmin; /* min threshold for anon pages */

int vtextmin; /* min threshold for vtext pages */

int vnodemin; /* min threshold for vnode pages */

int anonminpct; /* min percent anon pages */

int vtextminpct;/* min percent vtext pages */

int vnodeminpct;/* min percent vnode pages */

/* swap */

int nswapdev; /* [aS] number of configured swap devices in system */

int swpages; /* [aS] number of PAGE_SIZE'ed swap pages */

int swpginuse; /* [aS] number of swap pages in use */

int swpgonly; /* [a] number of swap pages in use, not also in RAM */

int nswget; /* [a] number of swap pages moved from disk to RAM */

int nanon; /* XXX number total of anon's in system */

int unused05; /* formerly nanonneeded */

int unused06; /* formerly nfreeanon */

/* stat counters */

int faults; /* [p] page fault count */

int traps; /* [a] trap count */

int intrs; /* [a] interrupt count */

int swtch; /* context switch count */

int softs; /* [a] software interrupt count */

int syscalls; /* [a] system calls */

int pageins; /* [p] pagein operation count */

/* pageouts are in pdpageouts below */

int pcphit; /* [a] # of pagealloc from per-CPU cache */

int pcpmiss; /* [a] # of times a per-CPU cache was empty */

int pgswapin; /* pages swapped in */

int pgswapout; /* [a] pages swapped out */

int forks; /* forks */

int forks_ppwait; /* forks where parent waits */

int forks_sharevm; /* forks where vmspace is shared */

int pga_zerohit; /* [a] pagealloc where zero wanted and zero

was available */

int pga_zeromiss; /* [a] pagealloc where zero wanted and zero

not available */

int unused09; /* formerly zeroaborts */

/* fault subcounters */

int fltnoram; /* [p] # of times fault was out of ram */

int fltnoanon; /* [p] # of times fault was out of anons */

int fltnoamap; /* [p] # of times fault was out of amap chunks */

int fltpgwait; /* [p] # of times fault had to wait on a page */

int fltpgrele; /* [p] # of times fault found a released page */

int fltrelck; /* [p] # of times fault relock is a success */

int fltnorelck; /* [p] # of times fault relock failed */

int fltanget; /* [p] # of times fault gets anon page */

int fltanretry; /* [p] # of times fault retrys an anon get */

int fltamcopy; /* [p] # of times fault clears "needs copy" */

int fltnamap; /* [p] # of times fault maps a neighbor anon page */

int fltnomap; /* [p] # of times fault maps a neighbor obj page */

int fltlget; /* [p] # of times fault does a locked pgo_get */

int fltget; /* [p] # of times fault does an unlocked get */

int flt_anon; /* [p] # of times fault anon (case 1a) */

int flt_acow; /* [p] # of times fault anon cow (case 1b) */

int flt_obj; /* [p] # of times fault is on object page (2a) */

int flt_prcopy; /* [p] # of times fault promotes with copy (2b) */

int flt_przero; /* [p] # of times fault promotes with zerofill (2b) */

int fltup; /* [p] # of times fault upgrade is a success */

int fltnoup; /* [p] # of times fault upgrade failed */

/* daemon counters */

int pdwoke; /* [ao] # of times daemon woke up */

int pdrevs; /* [ao] # of times daemon scanned for free pages */

int pdswout; /* [o] # of times daemon called for swapout */

int pdfreed; /* [ao] # of pages daemon freed since boot */

int pdscans; /* [ao] # of pages daemon scanned since boot */

int pdanscan; /* [ao] # of anonymous pages scanned by daemon */

int pdobscan; /* [ao] # of object pages scanned by daemon */

int pdreact; /* [ao] # of pages daemon reactivated since boot */

int pdbusy; /* [ao] # of times daemon found a busy page */

int pdpageouts; /* [ao] # of times daemon started a pageout */

int pdpending; /* [ao] # of times daemon got a pending pagout */

int pddeact; /* [ao] # of pages daemon deactivates */

int swpskip; /* [ao] # of pages delayed because swap crypt busy */

int fpswtch; /* [a] FPU context switches */

int kmapent; /* [a] number of kernel map entries */

};

struct _ps_strings {

void *val;

};

#ifdef _KERNEL

static inline int

atomic_load_sint(volatile const int *p)

{

return *p;

}

/*

* Per-cpu UVM counters.

*/

extern struct cpumem *uvmexp_counters;

enum uvm_exp_counters {

/* stat counters */

faults, /* page fault count */

pageins, /* pagein operation count */

/* fault subcounters */

flt_noram, /* number of times fault was out of ram */

flt_noanon, /* number of times fault was out of anons */

flt_noamap, /* number of times fault was out of amap chunks */

flt_pgwait, /* number of times fault had to wait on a page */

flt_pgrele, /* number of times fault found a released page */

flt_relck, /* number of times fault relock is a success */

flt_norelck, /* number of times fault relock failed */

flt_anget, /* number of times fault gets anon page */

flt_anretry, /* number of times fault retrys an anon get */

flt_amcopy, /* number of times fault clears "needs copy" */

flt_namap, /* number of times fault maps a neighbor anon page */

flt_nomap, /* number of times fault maps a neighbor obj page */

flt_lget, /* number of times fault does a locked pgo_get */

flt_get, /* number of times fault does an unlocked get */

flt_anon, /* number of times fault anon (case 1a) */

flt_acow, /* number of times fault anon cow (case 1b) */

flt_obj, /* number of times fault is on object page (2a) */

flt_prcopy, /* number of times fault promotes with copy (2b) */

flt_przero, /* number of times fault promotes with zerofill (2b) */

flt_up, /* number of times fault upgrade is a success */

flt_noup, /* number of times fault upgrade failed */

exp_ncounters

};

#endif /* _KERNEL */

#endif /*_UVM_UVMEXP_ */