Re: [RFC] Optimization for use-once pages

From: Daniel Phillips (
Date: Tue Jul 24 2001 - 20:30:34 EST

On Wednesday 25 July 2001 02:43, Anton Altaparmakov wrote:
> At 01:04 25/07/2001, Daniel Phillips wrote:
> >At that size you'd run a real risk of missing the tell-tale multiple
> >references that mark a page as frequently used. Think about
> > metadata here (right now, that usually just means directory pages,
> > but later... who knows).
> This is not actually implemented yet, but NTFS TNG will use the page
> cache to hold both the LCN (physical clusters) and MFT (on disk
> inodes) allocation bitmaps in addition to file and directory pages.
> (Admittedly the LCN case folds into the file pages in page cache one
> as the LCN bitmap is just stored inside the usual data of a file
> called $Bitmap, but the MFT case is more complex as it is in an
> additional attribute inside the file $MFT so the normal file
> read/write functions definitely cannot be used. The usual data here
> is the actual on disk inodes...)
> Just FYI.

Yes, not a surprise. Plus, I was working on an experimental patch to
put Ext2 index blocks into the page cache just before I got off on this
use-once tangent. Time to go back to that...

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