Three trillion filesystems for which we don't have a mkfs which
access bh->b_data all over the place :(
> If filesystems
> access them without buffer_heads there is no reason to not put the
> pages in high memory.
They'd create a separate address_space in that case. The blockdev
mappings are pretty unambiguously tied to ZONE_NORMAL in bdget().
> I also remember vaguely that you intend to move
> buffer_heads to high memory in the longer term..
Yes, vaguely. Haven't thought about it a lot. I suspect the
present kmap() infrastructure would collapse under the load,
so surgery there would be needed first.
> > 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.
In which case one could trivially report the number of active pages
against all superblocks. Let's park this one until a need
is demonstrated though...
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