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Introduce a sysctl for reporting the number of fully populated reservations.

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This commit is contained in:
Alan Cox 2015-08-06 21:27:50 +00:00
parent 374b1ec1ea
commit e0a63baae4
1 changed files with 32 additions and 0 deletions
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32
sys/vm/vm_reserv.c
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@ -217,6 +217,11 @@ static long vm_reserv_freed;
SYSCTL_LONG(_vm_reserv, OID_AUTO, freed, CTLFLAG_RD,
&vm_reserv_freed, 0, "Cumulative number of freed reservations");
static int sysctl_vm_reserv_fullpop(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_vm_reserv, OID_AUTO, fullpop, CTLTYPE_INT | CTLFLAG_RD, NULL, 0,
sysctl_vm_reserv_fullpop, "I", "Current number of full reservations");
static int sysctl_vm_reserv_partpopq(SYSCTL_HANDLER_ARGS);
SYSCTL_OID(_vm_reserv, OID_AUTO, partpopq, CTLTYPE_STRING | CTLFLAG_RD, NULL, 0,
@ -234,6 +239,33 @@ static boolean_t vm_reserv_has_pindex(vm_reserv_t rv,
static void vm_reserv_populate(vm_reserv_t rv, int index);
static void vm_reserv_reclaim(vm_reserv_t rv);
/*
* Returns the current number of full reservations.
*
* Since the number of full reservations is computed without acquiring the
* free page queue lock, the returned value may be inexact.
*/
static int
sysctl_vm_reserv_fullpop(SYSCTL_HANDLER_ARGS)
{
vm_paddr_t paddr;
struct vm_phys_seg *seg;
vm_reserv_t rv;
int fullpop, segind;
fullpop = 0;
for (segind = 0; segind < vm_phys_nsegs; segind++) {
seg = &vm_phys_segs[segind];
paddr = roundup2(seg->start, VM_LEVEL_0_SIZE);
while (paddr + VM_LEVEL_0_SIZE <= seg->end) {
rv = &vm_reserv_array[paddr >> VM_LEVEL_0_SHIFT];
fullpop += rv->popcnt == VM_LEVEL_0_NPAGES;
paddr += VM_LEVEL_0_SIZE;
}
}
return (sysctl_handle_int(oidp, &fullpop, 0, req));
}
/*
* Describes the current state of the partially-populated reservation queue.
*/