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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

June 2024 Kernel Hackers Manual 3.10