diff options
| author | dg <dg@FreeBSD.org> | 1994-09-25 04:02:10 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1994-09-25 04:02:10 +0000 |
| commit | b769fbff39ae682daf13a0d9161d74fd62791501 (patch) | |
| tree | 8a86ae913eb1d53f954fc24480f0ea9ba4a2748d /sys/vm/swap_pager.c | |
| parent | 861d84d3fe7f4e3866f8ec2883634156c0d78630 (diff) | |
| download | FreeBSD-src-b769fbff39ae682daf13a0d9161d74fd62791501.zip FreeBSD-src-b769fbff39ae682daf13a0d9161d74fd62791501.tar.gz | |
Disabled swap anti-fragmentation code. It reduces swap paging performance
by 20% in my tests, and it appears to be the cause of a swap leak.
Submitted by: John Dyson
Diffstat (limited to 'sys/vm/swap_pager.c')
| -rw-r--r-- | sys/vm/swap_pager.c | 16 |
1 files changed, 9 insertions, 7 deletions
diff --git a/sys/vm/swap_pager.c b/sys/vm/swap_pager.c index e3473ed..54aa0df 100644 --- a/sys/vm/swap_pager.c +++ b/sys/vm/swap_pager.c @@ -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 |
