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Use TUNABLE_INT_FETCH for boot_pages.

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vm.boot_pages is marked as a CTLFLAG_RDTUN, but it's used by the VM
before the sysctl subsystem is initialsed.  We manually fetch the
variable from the environment to work around this problem.

Tested by:	Keith White kwhite at uottawa.ca
MFC after:	1 week
This commit is contained in:
Rui Paulo 2015-03-24 20:09:55 +00:00
parent b0bce0aef2
commit 57e5a8b184
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=280457
1 changed files with 4 additions and 2 deletions
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6
sys/vm/vm_page.c
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@ -134,8 +134,9 @@ long first_page;
int vm_page_zero_count;
static int boot_pages = UMA_BOOT_PAGES;
SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RDTUN, &boot_pages, 0,
"number of pages allocated for bootstrapping the VM system");
SYSCTL_INT(_vm, OID_AUTO, boot_pages, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
&boot_pages, 0,
"number of pages allocated for bootstrapping the VM system");
static int pa_tryrelock_restart;
SYSCTL_INT(_vm, OID_AUTO, tryrelock_restart, CTLFLAG_RD,
@ -349,6 +350,7 @@ vm_page_startup(vm_offset_t vaddr)
* Allocate memory for use when boot strapping the kernel memory
* allocator.
*/
TUNABLE_INT_FETCH("vm.boot_pages", &boot_pages);
new_end = end - (boot_pages * UMA_SLAB_SIZE);
new_end = trunc_page(new_end);
mapped = pmap_map(&vaddr, new_end, end,