1.. SPDX-License-Identifier: GPL-2.0 2 3========== 4Page Cache 5========== 6 7The page cache is the primary way that the user and the rest of the kernel 8interact with filesystems. It can be bypassed (e.g. with O_DIRECT), 9but normal reads, writes and mmaps go through the page cache. 10 11Folios 12====== 13 14The folio is the unit of memory management within the page cache. 15Operations 16