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Allocate the page buckets out of kernel_map, not kmem_map. Saves 16

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or so kmem_map pages on a 32MB SPARCstation 2.
This commit is contained in:
thorpej 2000-02-13 03:34:40 +00:00
parent 952281e8fb
commit 9671588a30
1 changed files with 19 additions and 13 deletions
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32
sys/uvm/uvm_page.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_page.c,v 1.29 1999/12/30 16:09:47 eeh Exp $ */
/* $NetBSD: uvm_page.c,v 1.30 2000/02/13 03:34:40 thorpej Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -108,8 +108,8 @@ static vaddr_t virtual_space_end;
/*
* we use a hash table with only one bucket during bootup. we will
* later rehash (resize) the hash table once malloc() is ready.
* we static allocate the bootstrap bucket below...
* later rehash (resize) the hash table once the allocator is ready.
* we static allocate the one bootstrap bucket below...
*/
static struct pglist uvm_bootbucket;
@ -228,7 +228,7 @@ uvm_page_init(kvm_startp, kvm_endp)
/*
* step 2: init the <obj,offset> => <page> hash table. for now
* we just have one bucket (the bootstrap bucket). later on we
* will malloc() new buckets as we dynamically resize the hash table.
* will allocate new buckets as we dynamically resize the hash table.
*/
uvm.page_nhash = 1; /* 1 bucket */
@ -733,6 +733,7 @@ uvm_page_rehash()
int freepages, lcv, bucketcount, s, oldcount;
struct pglist *newbuckets, *oldbuckets;
struct vm_page *pg;
size_t newsize, oldsize;
/*
* compute number of pages that can go in the free pool
@ -752,13 +753,21 @@ uvm_page_rehash()
bucketcount = bucketcount * 2;
/*
* malloc new buckets
* compute the size of the current table and new table.
*/
MALLOC(newbuckets, struct pglist *, sizeof(struct pglist) * bucketcount,
M_VMPBUCKET, M_NOWAIT);
oldbuckets = uvm.page_hash;
oldcount = uvm.page_nhash;
oldsize = round_page(sizeof(struct pglist) * oldcount);
newsize = round_page(sizeof(struct pglist) * bucketcount);
/*
* allocate the new buckets
*/
newbuckets = (struct pglist *) uvm_km_alloc(kernel_map, newsize);
if (newbuckets == NULL) {
printf("vm_page_physrehash: WARNING: could not grow page "
printf("uvm_page_physrehash: WARNING: could not grow page "
"hash table\n");
return;
}
@ -771,9 +780,6 @@ uvm_page_rehash()
s = splimp();
simple_lock(&uvm.hashlock);
/* swap old for new ... */
oldbuckets = uvm.page_hash;
oldcount = uvm.page_nhash;
uvm.page_hash = newbuckets;
uvm.page_nhash = bucketcount;
uvm.page_hashmask = bucketcount - 1; /* power of 2 */
@ -791,11 +797,11 @@ uvm_page_rehash()
splx(s);
/*
* free old bucket array if we malloc'd it previously
* free old bucket array if is not the boot-time table
*/
if (oldbuckets != &uvm_bootbucket)
FREE(oldbuckets, M_VMPBUCKET);
uvm_km_free(kernel_map, (vaddr_t) oldbuckets, oldsize);
/*
* done