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Rather than using u_shorts, use u_ints and bitfields in the vm_page. This

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provides us more flexibility with pageq-locked fields, and clarifies the
locking semantics for platforms which cannot address shorts.

From Ross Harvey.
This commit is contained in:
thorpej 2001-06-28 00:26:38 +00:00
parent 8217ab697c
commit c3cd2c3cfc
1 changed files with 13 additions and 15 deletions
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28
sys/uvm/uvm_page.h
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_page.h,v 1.26 2001/05/25 04:06:16 chs Exp $ */
/* $NetBSD: uvm_page.h,v 1.27 2001/06/28 00:26:38 thorpej Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -112,11 +112,6 @@
* seperated things back out again.
*
* note the page structure has no lock of its own.
*
* XXX the use of locked u_short fields is dangerous, as they are not
* addressable on all architectures and hence cannot be individually
* locked. Right now it works because each aligned pair uses the same
* lock and all current ports can lock an int32_t.
*/
#include <uvm/uvm_extern.h>
@ -132,10 +127,13 @@ struct vm_page {
struct uvm_object *uobject; /* object (O,P) */
voff_t offset; /* offset into object (O,P) */
u_short flags; /* object flags [O] */
u_short version; /* version count [O] */
u_short wire_count; /* wired down map refs [P] */
u_short pqflags; /* page queue flags [P] */
u_int flags: 16, /* object flags [O] */
version: 16; /* version count [O] */
u_int wire_count: 16, /* wired down map refs [P] */
pqflags: 8, /* page queue flags [P] */
: 8;
u_int loan_count; /* number of active loans
* to read: [O or P]
* to modify: [O _and_ P] */
@ -179,12 +177,12 @@ struct vm_page {
#define PG_PAGER1 0x1000 /* pager-specific flag */
#define PQ_FREE 0x0001 /* page is on free list */
#define PQ_INACTIVE 0x0002 /* page is in inactive list */
#define PQ_ACTIVE 0x0004 /* page is in active list */
#define PQ_ANON 0x0010 /* page is part of an anon, rather
#define PQ_FREE 0x01 /* page is on free list */
#define PQ_INACTIVE 0x02 /* page is in inactive list */
#define PQ_ACTIVE 0x04 /* page is in active list */
#define PQ_ANON 0x10 /* page is part of an anon, rather
than an uvm_object */
#define PQ_AOBJ 0x0020 /* page is part of an anonymous
#define PQ_AOBJ 0x20 /* page is part of an anonymous
uvm_object */
#define PQ_SWAPBACKED (PQ_ANON|PQ_AOBJ)