개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

vm_page_alloc(9)

VM_PAGE_ALLOC(9)         BSD Kernel Developer's Manual        VM_PAGE_ALLOC(9)

NAME
     vm_page_alloc — allocate a page for a vm_object

SYNOPSIS
     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_page.h>

     vm_page_t
     vm_page_alloc(vm_object_t object, vm_pindex_t pindex, int req);

DESCRIPTION
     The vm_page_alloc() function allocates a page at pindex within object.
     It is assumed that a page has not already been allocated at pindex.  The
     page returned is inserted into the object, unless VM_ALLOC_NOOBJ is spec‐
     ified in the req.

     vm_page_alloc() will not sleep.

     Its arguments are:

     object  The VM object to allocate the page for.  The object must be
             locked if VM_ALLOC_NOOBJ is not specified.

     pindex  The index into the object at which the page should be inserted.

     req     The bitwise-inclusive OR of a class and any optional flags indi‐
             cating how the page should be allocated.

             Exactly one of the following classes must be specified:

             VM_ALLOC_NORMAL     The page should be allocated with no special
                                 treatment.

             VM_ALLOC_SYSTEM     The page can be allocated if the cache is
                                 empty and the free page count is above the
                                 interrupt reserved water mark.  This flag
                                 should be used only when the system really
                                 needs the page.

             VM_ALLOC_INTERRUPT  vm_page_alloc() is being called during an
                                 interrupt.  A page will be returned success‐
                                 fully if the free page count is greater than
                                 zero.

             The optional flags are:

             VM_ALLOC_NOBUSY  The returned page will not be exclusive busy.

             VM_ALLOC_NODUMP  The returned page will not be included in any
                              kernel core dumps regardless of whether or not
                              it is mapped in to KVA.

             VM_ALLOC_NOOBJ   Do not associate the allocated page with a vm
                              object.  The object argument is ignored.

             VM_ALLOC_SBUSY   The returned page will be shared busy.

             VM_ALLOC_WIRED   The returned page will be wired.

             VM_ALLOC_ZERO    Indicate a preference for a pre-zeroed page.
                              There is no guarantee that the returned page
                              will be zeroed, but it will have the PG_ZERO
                              flag set if it is zeroed.

RETURN VALUES
     The vm_page_t that was allocated is returned if successful; otherwise,
     NULL is returned.

NOTES
     The pager process is always upgraded to VM_ALLOC_SYSTEM unless
     VM_ALLOC_INTERRUPT is set.

AUTHORS
     This manual page was written by Chad David <davidc@acns.ab.ca>.

BSD                            November 16, 2016                           BSD