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Try to dynamically size the VM_KMEM_SIZE (but is still able to be overridden

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in a way identically as before.)  I had problems with the system properly
handling the number of vnodes when there is alot of system memory, and the
default VM_KMEM_SIZE.  Two new options "VM_KMEM_SIZE_SCALE" and
"VM_KMEM_SIZE_MAX" have been added to support better auto-sizing for systems
with greater than 128MB.
This commit is contained in:
John Dyson 1998-02-23 07:41:23 +00:00
parent 64d3c7e32d
commit 8a58a9f6c9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=33756
1 changed files with 39 additions and 10 deletions
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49
sys/kern/kern_malloc.c
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@ -31,9 +31,11 @@
* SUCH DAMAGE.
*
* @(#)kern_malloc.c 8.3 (Berkeley) 1/4/94
* $Id: kern_malloc.c,v 1.42 1998/02/06 12:13:23 eivind Exp $
* $Id: kern_malloc.c,v 1.43 1998/02/09 06:09:22 eivind Exp $
*/
#include "opt_vm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
@ -61,6 +63,7 @@ static struct kmembuckets bucket[MINBUCKET + 16];
static struct kmemusage *kmemusage;
static char *kmembase;
static char *kmemlimit;
static int vm_kmem_size;
#ifdef DIAGNOSTIC
/*
@ -371,6 +374,7 @@ kmeminit(dummy)
{
register long indx;
int npg;
int mem_size;
#if ((MAXALLOCSAVE & (MAXALLOCSAVE - 1)) != 0)
#error "kmeminit: MAXALLOCSAVE not power of 2"
@ -381,7 +385,36 @@ kmeminit(dummy)
#if (MAXALLOCSAVE < PAGE_SIZE)
#error "kmeminit: MAXALLOCSAVE too small"
#endif
npg = (nmbufs * MSIZE + nmbclusters * MCLBYTES + VM_KMEM_SIZE)
/*
* Try to auto-tune the kernel memory size, so that it is
* more applicable for a wider range of machine sizes.
* On an X86, a VM_KMEM_SIZE_SCALE value of 4 is good, while
* a VM_KMEM_SIZE of 12MB is a fair compromise. The
* VM_KMEM_SIZE_MAX is dependent on the maximum KVA space
* available, and on an X86 with a total KVA space of 256MB,
* try to keep VM_KMEM_SIZE_MAX at 80MB or below.
*
* Note that the kmem_map is also used by the zone allocator,
* so make sure that there is enough space.
*/
vm_kmem_size = VM_KMEM_SIZE;
mem_size = cnt.v_page_count * PAGE_SIZE;
#if defined(VM_KMEM_SIZE_SCALE)
if ((mem_size / VM_KMEM_SIZE_SCALE) > vm_kmem_size)
vm_kmem_size = mem_size / VM_KMEM_SIZE_SCALE;
#endif
#if defined(VM_KMEM_SIZE_MAX)
if (vm_kmem_size >= VM_KMEM_SIZE_MAX)
vm_kmem_size = VM_KMEM_SIZE_MAX;
#endif
if (vm_kmem_size > 2 * (cnt.v_page_count * PAGE_SIZE))
vm_kmem_size = 2 * (cnt.v_page_count * PAGE_SIZE);
npg = (nmbufs * MSIZE + nmbclusters * MCLBYTES + vm_kmem_size)
/ PAGE_SIZE;
kmemusage = (struct kmemusage *) kmem_alloc(kernel_map,
@ -403,6 +436,7 @@ malloc_init(type)
struct malloc_type *type;
{
int npg;
int mem_size;
if (type->ks_magic != M_MAGIC)
panic("malloc type lacks magic");
@ -411,15 +445,10 @@ malloc_init(type)
panic("malloc_init not allowed before vm init");
/*
* Limit maximum memory for each type to 60% of malloc area size or
* 60% of physical memory, whichever is smaller.
* The default limits for each malloc region is 1/2 of the
* malloc portion of the kmem map size.
*/
npg = (nmbufs * MSIZE + nmbclusters * MCLBYTES + VM_KMEM_SIZE)
/ PAGE_SIZE;
type->ks_limit = min(cnt.v_page_count * PAGE_SIZE,
(npg * PAGE_SIZE - nmbclusters * MCLBYTES
- nmbufs * MSIZE)) * 6 / 10;
type->ks_limit = vm_kmem_size / 2;
type->ks_next = kmemstatistics;
kmemstatistics = type;
}