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uvm_loanzero:

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- after sleeping for memory, re-check if we have a page.
- put the allocated page to pageq to appease UVM_PAGE_TRKOWN.
- dequeue the page when doing ->K loan.
This commit is contained in:
yamt 2003-10-27 12:47:33 +00:00
parent 060a72601c
commit 2022580e89
1 changed files with 8 additions and 3 deletions
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11
sys/uvm/uvm_loan.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_loan.c,v 1.43 2003/10/26 16:04:00 yamt Exp $ */
/* $NetBSD: uvm_loan.c,v 1.44 2003/10/27 12:47:33 yamt Exp $ */
/*
*
@ -39,7 +39,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_loan.c,v 1.43 2003/10/26 16:04:00 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_loan.c,v 1.44 2003/10/27 12:47:33 yamt Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -667,6 +667,7 @@ uvm_loanzero(ufi, output, flags)
struct uvm_object *uobj = ufi->entry->object.uvm_obj;
struct vm_amap *amap = ufi->entry->aref.ar_amap;
again:
simple_lock(&uvm_loanzero_object.vmobjlock);
/*
@ -689,18 +690,22 @@ uvm_loanzero(ufi, output, flags)
if (uobj) {
simple_lock(&uobj->vmobjlock);
}
simple_lock(&uvm_loanzero_object.vmobjlock);
goto again;
}
/* got a zero'd page. */
pg->flags &= ~(PG_WANTED|PG_BUSY|PG_FAKE);
pg->flags |= PG_RDONLY;
uvm_lock_pageq();
uvm_pageactivate(pg);
uvm_unlock_pageq();
UVM_PAGE_OWN(pg, NULL);
}
if ((flags & UVM_LOAN_TOANON) == 0) { /* loaning to kernel-page */
uvm_lock_pageq();
pg->loan_count++;
uvm_pagedequeue(pg);
uvm_unlock_pageq();
simple_unlock(&uvm_loanzero_object.vmobjlock);
**output = pg;