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Add support to mincore for detecting whether a page is part of a

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"super" page or not.

Reviewed by:	alc, ups
This commit is contained in:
Paul Saab 2008-03-28 04:29:27 +00:00
parent 7b3fa39a40
commit 6e7534b8c8
4 changed files with 7 additions and 2 deletions
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2
lib/libc/sys/mincore.2
View File

@ -72,6 +72,8 @@ Page has been modified by us.
Page has been referenced. Page has been referenced.
.It Dv MINCORE_MODIFIED_OTHER .It Dv MINCORE_MODIFIED_OTHER
Page has been modified. Page has been modified.
.It Dv MINCORE_SUPER
Page is part of a "super" page. (only i386 & amd64)
.El .El
.Pp .Pp
The information returned by The information returned by

3
sys/amd64/amd64/pmap.c
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@ -4371,6 +4371,7 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr)
if (pdep != NULL && (*pdep & PG_V)) { if (pdep != NULL && (*pdep & PG_V)) {
if (*pdep & PG_PS) { if (*pdep & PG_PS) {
pte = *pdep; pte = *pdep;
val = MINCORE_SUPER;
/* Compute the physical address of the 4KB page. */ /* Compute the physical address of the 4KB page. */
pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) & pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) &
PG_FRAME; PG_FRAME;
@ -4385,7 +4386,7 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr)
PMAP_UNLOCK(pmap); PMAP_UNLOCK(pmap);
if (pte != 0) { if (pte != 0) {
val = MINCORE_INCORE; val |= MINCORE_INCORE;
if ((pte & PG_MANAGED) == 0) if ((pte & PG_MANAGED) == 0)
return val; return val;

3
sys/i386/i386/pmap.c
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@ -4481,6 +4481,7 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr)
if (*pdep != 0) { if (*pdep != 0) {
if (*pdep & PG_PS) { if (*pdep & PG_PS) {
pte = *pdep; pte = *pdep;
val = MINCORE_SUPER:
/* Compute the physical address of the 4KB page. */ /* Compute the physical address of the 4KB page. */
pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) & pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) &
PG_FRAME; PG_FRAME;
@ -4497,7 +4498,7 @@ pmap_mincore(pmap_t pmap, vm_offset_t addr)
PMAP_UNLOCK(pmap); PMAP_UNLOCK(pmap);
if (pte != 0) { if (pte != 0) {
val = MINCORE_INCORE; val |= MINCORE_INCORE;
if ((pte & PG_MANAGED) == 0) if ((pte & PG_MANAGED) == 0)
return val; return val;

1
sys/sys/mman.h
View File

@ -139,6 +139,7 @@
#define MINCORE_MODIFIED 0x4 /* Page has been modified by us */ #define MINCORE_MODIFIED 0x4 /* Page has been modified by us */
#define MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */ #define MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */
#define MINCORE_MODIFIED_OTHER 0x10 /* Page has been modified */ #define MINCORE_MODIFIED_OTHER 0x10 /* Page has been modified */
#define MINCORE_SUPER 0x20 /* Page is a "super" page */
/* /*
* Anonymous object constant for shm_open(). * Anonymous object constant for shm_open().