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Changed to reclaim memory from other buffers to eliminate memory

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thrashing.

Submitted by:	John Dyson
This commit is contained in:
David Greenman 1994-08-30 18:19:11 +00:00
parent 8fdce837c3
commit e66defe8ab
1 changed files with 37 additions and 2 deletions
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39
sys/kern/vfs_bio.c
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@ -16,7 +16,7 @@
* 4. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.8 1994/08/08 15:40:59 wollman Exp $
* $Id: vfs_bio.c,v 1.9 1994/08/18 22:35:06 wollman Exp $
*/
#include <sys/param.h>
@ -661,6 +661,11 @@ vfs_update() {
}
}
#define MAXFREEBP 128
#define LDFREE_BUSY 1
#define LDFREE_WANT 2
int loadfreeing;
struct buf *freebp[MAXFREEBP];
/*
* these routines are not in the correct place (yet)
* also they work *ONLY* for kernel_pmap!!!
@ -676,7 +681,37 @@ vm_hold_load_pages(vm_offset_t froma, vm_offset_t toa) {
vm_offset_t pa;
tryagain:
if (cnt.v_free_count <= cnt.v_free_reserved) {
/*
* don't allow buffer cache to cause VM paging
*/
if ( cnt.v_free_count < cnt.v_free_min) {
if( !loadfreeing ) {
int n=0;
struct buf *bp;
loadfreeing = LDFREE_BUSY;
while( (cnt.v_free_count <= cnt.v_free_min) &&
(n < MAXFREEBP)) {
bp = geteblk(0);
if( bp)
freebp[n++] = bp;
else
break;
}
while(--n >= 0) {
brelse(freebp[n]);
}
if( loadfreeing & LDFREE_WANT)
wakeup((caddr_t) &loadfreeing);
loadfreeing = 0;
} else {
loadfreeing |= LDFREE_WANT;
tsleep(&loadfreeing, PRIBIO, "biofree", 0);
}
}
if (cnt.v_free_count <=
cnt.v_free_reserved + (toa-froma) / PAGE_SIZE) {
VM_WAIT;
goto tryagain;
}