Author: rpaulo
Date: Tue Mar 24 20:09:55 2015
New Revision: 280457
URL: https://svnweb.freebsd.org/changeset/base/280457
Log:
Use TUNABLE_INT_FETCH for boot_pages.
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
Modified:
head/sys/vm/vm_page.c
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Tue Mar 24 20:07:27 2015 (r280456)
+++ head/sys/vm/vm_page.c Tue Mar 24 20:09:55 2015 (r280457)
@@ -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,
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