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Introduce the vm.boot_pages tunable and sysctl, which controls the number

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of pages reserved to bootstrap the kernel memory allocator.

MFC after:	2 weeks
This commit is contained in:
Dag-Erling Smørgrav 2005-08-12 12:24:19 +00:00
parent 8ab2a64d2f
commit cfa22bcc4c
1 changed files with 8 additions and 3 deletions
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11
sys/vm/vm_page.c
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@ -102,9 +102,11 @@ __FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <sys/vmmeter.h>
#include <sys/vnode.h>
@ -132,6 +134,11 @@ int vm_page_array_size = 0;
long first_page = 0;
int vm_page_zero_count = 0;
static int boot_pages = UMA_BOOT_PAGES;
TUNABLE_INT("vm.boot_pages", &boot_pages);
SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RD, &boot_pages, 0,
"number of pages allocated for bootstrapping the VM system");
/*
* vm_set_page_size:
*
@ -175,7 +182,6 @@ vm_page_startup(vm_offset_t vaddr)
int biggestone;
vm_paddr_t total;
vm_size_t bootpages;
total = 0;
biggestsize = 0;
@ -219,8 +225,7 @@ vm_page_startup(vm_offset_t vaddr)
* Allocate memory for use when boot strapping the kernel memory
* allocator.
*/
bootpages = UMA_BOOT_PAGES * UMA_SLAB_SIZE;
new_end = end - bootpages;
new_end = end - (boot_pages * UMA_SLAB_SIZE);
new_end = trunc_page(new_end);
mapped = pmap_map(&vaddr, new_end, end,
VM_PROT_READ | VM_PROT_WRITE);