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| author | Konstantin Belousov <kib@FreeBSD.org> | 2010-02-27 17:11:15 +0000 |
|---|---|---|
| committer | Konstantin Belousov <kib@FreeBSD.org> | 2010-02-27 17:11:15 +0000 |
| commit | c46221d700b9acf486eba10d0f68cf73f6ad46c8 (patch) | |
| tree | cec2eb90019dabe7b487fd1f7da9e36dd8c26001 /share | |
| parent | ddb16cfc32263b4e47560b8f00ce4a2cfeed140e (diff) | |
| download | src-c46221d700b9acf486eba10d0f68cf73f6ad46c8.tar.gz src-c46221d700b9acf486eba10d0f68cf73f6ad46c8.zip | |
Update man page for vm_page_alloc(9).
Based on the submission by: Giovanni Trematerra <giovanni.trematerra gmail com>
MFC after: 3 days
Notes
Notes:
svn path=/head/; revision=204416
Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man9/vm_page_alloc.9 | 40 |
1 files changed, 31 insertions, 9 deletions
diff --git a/share/man/man9/vm_page_alloc.9 b/share/man/man9/vm_page_alloc.9 index 02e2b939b486..81070d665ef4 100644 --- a/share/man/man9/vm_page_alloc.9 +++ b/share/man/man9/vm_page_alloc.9 @@ -26,7 +26,7 @@ .\" .\" $FreeBSD$ .\" -.Dd July 13, 2001 +.Dd February 27, 2010 .Dt VM_PAGE_ALLOC 9 .Os .Sh NAME @@ -48,16 +48,26 @@ within .Fa object . It is assumed that a page has not already been allocated at .Fa pindex . -The page returned is inserted into the object, but is not inserted -into the pmap. +The page returned is inserted into the object, unless +.Dv VM_ALLOC_NOOBJ +is specified in the +.Fa page_req , +but is not inserted into a pmap. +The page may exists in the vm object cache, in which case it will +be reactivated instead, moving from the cache into the object page list. .Pp .Fn vm_page_alloc -will not block. +will not sleep. .Pp Its arguments are: .Bl -tag -width ".Fa page_req" .It Fa object The VM object to allocate the page for. +The +.Fa object +must be locked if +.Dv VM_ALLOC_NOOBJ +is not specified. .It Fa pindex The index into the object at which the page should be inserted. .It Fa page_req @@ -82,12 +92,24 @@ than zero. .It Dv VM_ALLOC_ZERO Indicate a preference for a pre-zeroed page. There is no guarantee that the page thus returned will be zeroed, but -it will be marked as such. +it will be marked by +.Dv PG_ZERO +flag if it is zeroed. .It Dv VM_ALLOC_NOOBJ -The page is associated with an unmanaged memory region, that is, there -is no backing VM object. -This is typically used to allocate pages within the kernel virtual -address space. +Do not associate the allocated page with a vm object. +The +.Fa object +argument is ignored. +.It Dv VM_ALLOC_NOBUSY +The page returned will not be busied. +.It Dv VM_ALLOC_WIRED +The returned page is wired. +.It Dv VM_ALLOC_IFNOTCACHED +Only allocate the page if it is not cached in the +.Fa object . +If the page at the specified +.Fa pindex +is cached, NULL is returned instead. .El .El .Sh RETURN VALUES |