Messages in this thread | | | Date | Mon, 27 Feb 2006 20:03:22 +1100 | From | Nick Piggin <> | Subject | Re: page cache question |
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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.
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