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Disabled swap anti-fragmentation code. It reduces swap paging performance

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by 20% in my tests, and it appears to be the cause of a swap leak.

Submitted by:	John Dyson
This commit is contained in:
dg 1994-09-25 04:02:10 +00:00
parent 861d84d3fe
commit b769fbff39
1 changed files with 9 additions and 7 deletions
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16
sys/vm/swap_pager.c
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@ -39,7 +39,7 @@
* from: Utah $Hdr: swap_pager.c 1.4 91/04/30$
*
* @(#)swap_pager.c 8.9 (Berkeley) 3/21/94
* $Id: swap_pager.c,v 1.7 1994/08/18 22:36:00 wollman Exp $
* $Id: swap_pager.c,v 1.8 1994/08/29 06:23:18 davidg Exp $
*/
/*
@ -355,6 +355,7 @@ swap_pager_setvalid(swp, offset, valid)
*/
int
swap_pager_getswapspace( unsigned amount, unsigned *rtval) {
#ifdef EXP
unsigned tmpalloc;
unsigned nblocksfrag = btodb(SWB_NPAGES*PAGE_SIZE);
if( amount < nblocksfrag) {
@ -366,6 +367,7 @@ swap_pager_getswapspace( unsigned amount, unsigned *rtval) {
*rtval = tmpalloc;
return 1;
}
#endif
if( !rlist_alloc(&swapmap, amount, rtval))
return 0;
else
@ -380,18 +382,18 @@ void
swap_pager_freeswapspace( unsigned from, unsigned to) {
unsigned nblocksfrag = btodb(SWB_NPAGES*PAGE_SIZE);
unsigned tmpalloc;
#ifdef EXP
if( ((to + 1) - from) >= nblocksfrag) {
while( (from + nblocksfrag) <= to + 1) {
rlist_free(&swapmap, from, from + nblocksfrag - 1);
from += nblocksfrag;
}
}
if( from >= to)
#endif
rlist_free(&swapmap, from, to);
#ifdef EXP
return;
}
rlist_free(&swapfrag, from, to);
while( rlist_alloc(&swapfrag, nblocksfrag, &tmpalloc)) {
rlist_free(&swapmap, tmpalloc, tmpalloc + nblocksfrag-1);
}
#endif
}
/*
* this routine frees swap blocks from a specified pager