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Improve algorithm for page hash queue. It was previously about

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as bad as it could be.  This algorithm appears to improve fork
performance (barely) measurably.
This commit is contained in:
John Dyson 1996-06-21 05:39:22 +00:00
parent 4be1e61baf
commit 2a4eb04bfd
1 changed files with 2 additions and 2 deletions
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4
sys/vm/vm_page.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
* $Id: vm_page.c,v 1.57 1996/06/16 20:37:31 dyson Exp $
* $Id: vm_page.c,v 1.58 1996/06/17 03:35:37 dyson Exp $
*/
/*
@ -373,7 +373,7 @@ vm_page_hash(object, pindex)
vm_object_t object;
vm_pindex_t pindex;
{
return ((unsigned) object + pindex) & vm_page_hash_mask;
return ((((unsigned) object) >> 5) + (pindex >> 1)) & vm_page_hash_mask;
}
/*