FIND_OR_CREATE_PAGE(9) Memory Management in Linux FIND_OR_CREATE_PAGE(9)
NAME
find_or_create_page - locate or add a pagecache page
SYNOPSIS
struct page * find_or_create_page(struct address_space * mapping, pgoff_t index, gfp_t gfp_mask);
ARGUMENTS
mapping
the page's address_space
index
the page's index into the mapping
gfp_mask
page allocation mode
DESCRIPTION
Looks up the page cache slot at mapping & offset. If there is a page cache page, it is returned locked and with an increased refcount.
If the page is not present, a new page is allocated using gfp_mask and added to the page cache and the VM's LRU list. The page is returned
locked and with an increased refcount.
On memory exhaustion, NULL is returned.
find_or_create_page may sleep, even if gfp_flags specifies an atomic allocation!
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 FIND_OR_CREATE_PAGE(9)
