lkml.org 
[lkml]   [2006]   [Feb]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: page cache question
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.
Send instant messages to your online friends http://au.messenger.yahoo.com

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-02-27 10:05    [W:0.054 / U:0.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site