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Eliminate inefficient check for dirty pages for pages in the PQ_CACHE

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queue.  Also, modify the MADV_FREE policy (it probably still isn't the final
version.)
This commit is contained in:
dyson 1996-05-24 05:17:21 +00:00
parent 5ff3dd6648
commit 992a2cacdc
1 changed files with 14 additions and 1 deletions
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15
sys/vm/vm_object.c
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@ -61,7 +61,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_object.c,v 1.72 1996/05/21 17:13:31 dyson Exp $
* $Id: vm_object.c,v 1.73 1996/05/23 00:45:58 dyson Exp $
*/
/*
@ -516,6 +516,10 @@ rescan:
if ((tp->flags & PG_BUSY) ||
(tp->flags & PG_CLEANCHK) == 0)
break;
if (tp->queue == PQ_CACHE) {
tp->flags &= ~PG_CLEANCHK;
break;
}
vm_page_test_dirty(tp);
if ((tp->dirty & tp->valid) == 0) {
tp->flags &= ~PG_CLEANCHK;
@ -536,6 +540,10 @@ rescan:
if ((tp->flags & PG_BUSY) ||
(tp->flags & PG_CLEANCHK) == 0)
break;
if (tp->queue == PQ_CACHE) {
tp->flags &= ~PG_CLEANCHK;
break;
}
vm_page_test_dirty(tp);
if ((tp->dirty & tp->valid) == 0) {
tp->flags &= ~PG_CLEANCHK;
@ -740,8 +748,13 @@ vm_object_madvise(object, pindex, count, advise)
*/
if (object->type == OBJT_SWAP)
swap_pager_dmzspace(object, m->pindex, 1);
/*
vm_page_protect(m, VM_PROT_NONE);
vm_page_free(m);
*/
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
m->dirty = 0;
vm_page_cache(m);
}
}
}