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g/c pv_page stuffs.

This commit is contained in:
yamt 2008-01-02 12:30:30 +00:00
parent b88ea32e70
commit d450c78d16
2 changed files with 3 additions and 63 deletions
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32
sys/arch/x86/include/pmap.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.h,v 1.7 2007/12/25 18:33:34 perry Exp $ */
/* $NetBSD: pmap.h,v 1.8 2008/01/02 12:30:30 yamt Exp $ */
/*
*
@ -178,36 +178,6 @@ struct pv_entry { /* locked by its list's pvh_lock */
struct vm_page *pv_ptp; /* the vm_page of the PTP */
};
/*
* pv_entrys are dynamically allocated in chunks from a single page.
* we keep track of how many pv_entrys are in use for each page and
* we can free pv_entry pages if needed. there is one lock for the
* entire allocation system.
*/
struct pv_page_info {
TAILQ_ENTRY(pv_page) pvpi_list;
struct pv_entry *pvpi_pvfree;
int pvpi_nfree;
};
/*
* number of pv_entry's in a pv_page
* (note: won't work on systems where NPBG isn't a constant)
*/
#define PVE_PER_PVPAGE ((PAGE_SIZE - sizeof(struct pv_page_info)) / \
sizeof(struct pv_entry))
/*
* a pv_page: where pv_entrys are allocated from
*/
struct pv_page {
struct pv_page_info pvinfo;
struct pv_entry pvents[PVE_PER_PVPAGE];
};
/*
* global kernel variables
*/

34
sys/arch/x86/x86/pmap.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.16 2008/01/02 11:48:33 ad Exp $ */
/* $NetBSD: pmap.c,v 1.17 2008/01/02 12:30:31 yamt Exp $ */
/*
* Copyright (c) 2007 Manuel Bouyer.
@ -154,7 +154,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.16 2008/01/02 11:48:33 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.17 2008/01/02 12:30:31 yamt Exp $");
#include "opt_user_ldt.h"
#include "opt_lockdebug.h"
@ -241,9 +241,6 @@ __KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.16 2008/01/02 11:48:33 ad Exp $");
* page is mapped in. this is critical for page based operations
* such as pmap_page_protect() [change protection on _all_ mappings
* of a page]
* - pv_page/pv_page_info: pv_entry's are allocated out of pv_page's.
* if we run out of pv_entry's we allocate a new pv_page and free
* its pv_entrys.
*/
/*
@ -279,22 +276,6 @@ __KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.16 2008/01/02 11:48:33 ad Exp $");
* pmap_growkernel() to grow the kernel PTPs in advance.
*
* [C] pv_entry structures
* - plan 1: try to allocate one off the free list
* => success: done!
* => failure: no more free pv_entrys on the list
* - plan 2: try to allocate a new pv_page to add a chunk of
* pv_entrys to the free list
* [a] obtain a free, unmapped, VA in kmem_map. either
* we have one saved from a previous call, or we allocate
* one now using a "vm_map_lock_try" in uvm_map
* => success: we have an unmapped VA, continue to [b]
* => failure: unable to lock kmem_map or out of VA in it.
* move on to plan 3.
* [b] allocate a page for the VA
* => success: map it in, free the pv_entry's, DONE!
* => failure: no free vm_pages, etc.
* save VA for later call to [a], go to plan 3.
* If we fail, we simply let pmap_enter() tell UVM about it.
*/
/*
@ -371,9 +352,6 @@ static vaddr_t pmap_maxkvaddr;
#define COUNT(x) /* nothing */
TAILQ_HEAD(pv_pagelist, pv_page);
typedef struct pv_pagelist pv_pagelist_t;
/*
* Global TLB shootdown mailbox.
*/
@ -452,14 +430,6 @@ static bool pmap_initialized = false; /* pmap_init done yet? */
static vaddr_t virtual_avail; /* VA of first free KVA */
static vaddr_t virtual_end; /* VA of last free KVA */
/*
* pv_page management structures
*/
#define PVE_LOWAT (PVE_PER_PVPAGE / 2) /* free pv_entry low water mark */
#define PVE_HIWAT (PVE_LOWAT + (PVE_PER_PVPAGE * 2))
/* high water mark */
static inline int
pv_compare(struct pv_entry *a, struct pv_entry *b)
{