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Added some more of John's "anti-chatter" fixes - set the page activation

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count to 0 after activating the page; the previous behavior biased the
pages too high in some cases.

Submitted by:	John Dyson
This commit is contained in:
David Greenman 1995-03-04 15:16:07 +00:00
parent b09e27e3d0
commit 9bd1697199
1 changed files with 11 additions and 4 deletions
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15
sys/kern/vfs_bio.c
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@ -18,7 +18,7 @@
* 5. Modifications may be freely made to this file if the above conditions
* are met.
*
* $Id: vfs_bio.c,v 1.32 1995/03/01 22:08:55 davidg Exp $
* $Id: vfs_bio.c,v 1.33 1995/03/03 22:13:00 davidg Exp $
*/
/*
@ -462,8 +462,10 @@ brelse(struct buf * bp)
(m->flags & PG_REFERENCED) == 0 &&
!pmap_is_referenced(VM_PAGE_TO_PHYS(m)))
vm_page_cache(m);
else if( (m->flags & PG_ACTIVE) == 0)
else if ((m->flags & PG_ACTIVE) == 0) {
vm_page_activate(m);
m->act_count = 0;
}
}
}
bufspace -= bp->b_bufsize;
@ -994,8 +996,10 @@ allocbuf(struct buf * bp, int size, int vmio)
if (!vm_page_is_valid(m, toff + off, bytesinpage)) {
bp->b_flags &= ~B_CACHE;
}
if ((m->flags & PG_ACTIVE) == 0)
if ((m->flags & PG_ACTIVE) == 0) {
vm_page_activate(m);
m->act_count = 0;
}
continue;
}
m = vm_page_lookup(obj, objoff);
@ -1023,6 +1027,7 @@ allocbuf(struct buf * bp, int size, int vmio)
}
m->valid = 0;
vm_page_activate(m);
m->act_count = 0;
} else if ((m->valid == 0) || (m->flags & PG_BUSY)) {
int j;
int bufferdestroyed = 0;
@ -1083,8 +1088,10 @@ allocbuf(struct buf * bp, int size, int vmio)
if (!vm_page_is_valid(m, toff + off, bytesinpage)) {
bp->b_flags &= ~B_CACHE;
}
if ((m->flags & PG_ACTIVE) == 0)
if ((m->flags & PG_ACTIVE) == 0) {
vm_page_activate(m);
m->act_count = 0;
}
m->flags |= PG_BUSY;
}
bp->b_pages[pageindex] = m;