Re: Pagecache: find_or_create_page does not call a proper pageallocator function

From: Hugh Dickins
Date: Tue Apr 24 2007 - 13:46:05 EST

On Tue, 24 Apr 2007, Christoph Lameter wrote:
> On Tue, 24 Apr 2007, Hugh Dickins wrote:
> > I've not yet looked at the patch under discussion, but this remark
> > prompts me... a couple of days ago I got very worried by the various
> > hard-wired GFP_HIGHUSER allocations in mm/migrate.c and mm/mempolicy.c,
> > and wondered how those would work out if someone has a blockdev mmap'ed.
> Hmmm.... These not that critical given that 32 bit NUMA systems are a bit
> rare.

That's true. And everybody but the owners of those systems wish
fervently that they didn't exist ;)

> And if a page is in the wrong area then it can be bounced before I/O
> is performed on it.

I think that much is also true, but not where the problem lies.
Isn't the problem that filesystems using these block devices
expect their metadata to be accessible without kmap calls?

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