Re: [PATCH] buffermem_pages removal (5/5)

[Christoph Hellwig]

On Tue, May 21, 2002 at 10:51:19AM -0700, Andrew Morton wrote:
> The buffermem_pages accounting is vaguely interesting because
> it tells us how much of ZONE_NORMAL is being usefully used for
> blockdev pagecache.  And ZONE_NORMAL utilisation is a bit of a
> hot topic at present.

Yho sais all blockdev mapping have to stay ZONE_NORMAL?  If filesystems
access them without buffer_heads there is no reason to not put the
pages in high memory.  I also remember vaguely that you intend to move
buffer_heads to high memory in the longer term..

> But the same information can be obtained on-demand by running
> around the bdev superblock's inodes adding up nr_pages.  That
> approach is better than the per-page atomic ops in buffer.c.

*nod*