Xin Zhao wrote:
Sorry if this question is dumb.
Linux uses address_space to identify pages in the page cache. An
address space is often associated with a memory object such as inode.
That seems to associate the cached page with that inode. My question
is: if a file is closed and the inode is destroyed, will the cached
page be removed from page cache immediately? If so, does that mean
Yes. The inode's struct address_space contains the radix tree which
indexes the pagecache pages.
the file system has to load data from disk again if a user promptly
open and read the same file again? If not, how does linux determine
when to evict a cached page? using LRU?
Yes they would have to be read again. However in general the inode is
not destroyed after the file is closed -- inodes are cached too.
--
SUSE Labs, Novell Inc.
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