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Linux page cache doubt

To: linux-xfs@xxxxxxxxxxx
Subject: Linux page cache doubt
From: Arun Ramakrishnan <ramakria@xxxxxxxxxxxxxxxxxx>
Date: Wed, 24 Oct 2001 16:26:33 -0400
Organization: Cluster I/O Lab,CIS Dept, The Ohio State Univ
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:0.9.2) Gecko/20010726 Netscape6/6.1
Hi All,
I recently read that all fs codes actually do I/O to and from the pagecache and then the dirty pages are synced to the disk later using the bdflush daemon.This approach has some performance problems when I/O is done thru write calls rather than mmap. I was just curious whether this path was modified when XFS was written ( ie how cud such a approach even work in case of jounalled file system when log operations are needed bfore the data gets written out). I am kinda newbie into kernel hacking and so i am sorry if my question sounds dumb.

Arun Ramakrishnan Graduate Research Assistant / Sys Admin
Linux Cluster I/O Lab
The Ohio State University

Ph : (614)-294-5523 (H)
    (614)-292-4634 (O)

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