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Add comments about CTLFLAG_RDTUN vs. TUNABLE_INT_FETCH.

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Requested by:	julian
This commit is contained in:
Rui Paulo 2015-03-26 05:20:18 +00:00
parent a756ffc931
commit b575067a21
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=280665
2 changed files with 5 additions and 1 deletions
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3
sys/vm/memguard.c
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@ -69,7 +69,7 @@ static SYSCTL_NODE(_vm, OID_AUTO, memguard, CTLFLAG_RW, NULL, "MemGuard data");
static u_int vm_memguard_divisor;
SYSCTL_UINT(_vm_memguard, OID_AUTO, divisor, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
&vm_memguard_divisor,
0, "(kmem_size/memguard_divisor) == memguard submap size");
0, "(kmem_size/memguard_divisor) == memguard submap size");
/*
* Short description (ks_shortdesc) of memory type to monitor.
@ -162,6 +162,7 @@ memguard_fudge(unsigned long km_size, const struct vm_map *parent_map)
u_long mem_pgs, parent_size;
vm_memguard_divisor = 10;
/* CTFLAG_RDTUN doesn't work during the early boot process. */
TUNABLE_INT_FETCH("vm.memguard.divisor", &vm_memguard_divisor);
parent_size = vm_map_max(parent_map) - vm_map_min(parent_map) +

3
sys/vm/vm_page.c
View file

@ -349,6 +349,9 @@ vm_page_startup(vm_offset_t vaddr)
/*
* Allocate memory for use when boot strapping the kernel memory
* allocator.
*
* CTFLAG_RDTUN doesn't work during the early boot process, so we must
* manually fetch the value.
*/
TUNABLE_INT_FETCH("vm.boot_pages", &boot_pages);
new_end = end - (boot_pages * UMA_SLAB_SIZE);