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/*
* Each physical page in the system has a struct page associated with
* it to keep track of whatever it is we are using the page for at the
* moment. Note that we have no way to track which tasks are using
* a page, though if it is a pagecache page, rmap structures can tell us
* who is mapping it.
*/
include/linux/mm_types.h
這裏請lemme知道什麼是「pagecache page」的意思？什麼是pagecache page
謝謝！