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MI VM: Make it possible to set size of superpage at boot instead of compile time.

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In order to allow single kernel to use PAE pagetables on i386 if
hardware supports it, and fall back to classic two-level paging
structures if not, superpage code should be able to adopt to either 2M
or 4M superpages size.  There I make MI VM structures large enough to
track the biggest possible superpage, by allowing architecture to
define VM_NFREEORDER_MAX and VM_LEVEL_0_ORDER_MAX constants.
Corresponding VM_NFREEORDER and VM_LEVEL_0_ORDER symbols can be
defined as runtime values and must be less than the _MAX constants.
If architecture does not define _MAXs, it is assumed that _MAX ==
normal constant.

Reviewed by:	markj
Tested by:	pho (as part of the larger patch)
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D18853
This commit is contained in:
Konstantin Belousov 2019-01-18 13:35:06 +00:00
parent 6465f3158a
commit f2a496d667
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=343145
3 changed files with 14 additions and 3 deletions
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3
sys/vm/vm_phys.c
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@ -106,7 +106,8 @@ static struct rwlock_padalign vm_phys_fictitious_reg_lock;
MALLOC_DEFINE(M_FICT_PAGES, "vm_fictitious", "Fictitious VM pages");
static struct vm_freelist __aligned(CACHE_LINE_SIZE)
vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL][VM_NFREEORDER];
vm_phys_free_queues[MAXMEMDOM][VM_NFREELIST][VM_NFREEPOOL]
[VM_NFREEORDER_MAX];
static int __read_mostly vm_nfreelists;

6
sys/vm/vm_phys.h
View File

@ -42,6 +42,10 @@
#ifdef _KERNEL
#ifndef VM_NFREEORDER_MAX
#define VM_NFREEORDER_MAX VM_NFREEORDER
#endif
/* Domains must be dense (non-sparse) and zero-based. */
struct mem_affinity {
vm_paddr_t start;
@ -63,7 +67,7 @@ struct vm_phys_seg {
vm_paddr_t end;
vm_page_t first_page;
int domain;
struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER];
struct vm_freelist (*free_queues)[VM_NFREEPOOL][VM_NFREEORDER_MAX];
};
extern struct vm_phys_seg vm_phys_segs[];

8
sys/vm/vm_reserv.c
View File

@ -77,10 +77,15 @@ __FBSDID("$FreeBSD$");
#if VM_NRESERVLEVEL > 0
#ifndef VM_LEVEL_0_ORDER_MAX
#define VM_LEVEL_0_ORDER_MAX VM_LEVEL_0_ORDER
#endif
/*
* The number of small pages that are contained in a level 0 reservation
*/
#define VM_LEVEL_0_NPAGES (1 << VM_LEVEL_0_ORDER)
#define VM_LEVEL_0_NPAGES_MAX (1 << VM_LEVEL_0_ORDER_MAX)
/*
* The number of bits by which a physical address is shifted to obtain the
@ -114,6 +119,7 @@ typedef u_long popmap_t;
* The number of population map entries in a reservation
*/
#define NPOPMAP howmany(VM_LEVEL_0_NPAGES, NBPOPMAP)
#define NPOPMAP_MAX howmany(VM_LEVEL_0_NPAGES_MAX, NBPOPMAP)
/*
* Number of elapsed ticks before we update the LRU queue position. Used
@ -191,7 +197,7 @@ struct vm_reserv {
uint16_t popcnt; /* (r) # of pages in use */
int lasttick; /* (r) last pop update tick. */
char inpartpopq; /* (d) */
popmap_t popmap[NPOPMAP]; /* (r) bit vector, used pages */
popmap_t popmap[NPOPMAP_MAX]; /* (r) bit vector, used pages */
};
#define vm_reserv_lockptr(rv) (&(rv)->lock)