diff options
| author | dyson <dyson@FreeBSD.org> | 1996-05-21 00:39:39 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1996-05-21 00:39:39 +0000 |
| commit | daaf2e922f028b52c7654d7ffacd86a5f39dd69f (patch) | |
| tree | 2698039ea13ab5e85733af0d4f0a79ed6c36e292 /sys/amd64 | |
| parent | f75c739b82093b27812c832125a3b748a2777d07 (diff) | |
| download | FreeBSD-src-daaf2e922f028b52c7654d7ffacd86a5f39dd69f.zip FreeBSD-src-daaf2e922f028b52c7654d7ffacd86a5f39dd69f.tar.gz | |
To quote Stephen McKay: pmap_copy is a complex NOP at this moment :-).
With this fix from Stephen, we are getting the target fork performance
that I have been trying to attain: P5-166, before the mega-commit: 700-800usecs,
after: 600usecs, with Stephen's fix: 500usecs!!! Also, this could be the
solution of some strange panic problems...
Reviewed by: dyson@freebsd.org
Submitted by: Stephen McKay <syssgm@devetir.qld.gov.au>
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/pmap.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index 61da7a1..7efb451 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -39,7 +39,7 @@ * SUCH DAMAGE. * * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 - * $Id: pmap.c,v 1.90 1996/05/18 03:36:14 dyson Exp $ + * $Id: pmap.c,v 1.91 1996/05/19 07:36:37 dyson Exp $ */ /* @@ -1943,7 +1943,7 @@ pmap_copy(dst_pmap, src_pmap, dst_addr, len, src_addr) pdnxt = ((addr + PAGE_SIZE*NPTEPG) & ~(PAGE_SIZE*NPTEPG - 1)); srcptepaddr = (vm_offset_t) src_pmap->pm_pdir[addr >> PDRSHIFT]; - if (srcptepaddr) { + if (srcptepaddr == 0) { continue; } |
