Re: dbench on tmpfs OOM's

From: Christoph Rohland (
Date: Tue Sep 17 2002 - 02:57:18 EST

Hi Hugh,

On Tue, 17 Sep 2002, Hugh Dickins wrote:
> What I never did was try GFP_HIGHUSER and kmap on the index pages:
> I think I decided back then that it wasn't likely to be needed
> (sparsely filled file indexes are a rarer case than sparsely filled
> pagetables, once the stupidity is fixed; and small files don't use
> index pages at all). But Bill's testing may well prove me wrong.

I think that this would be a good improvement. Big database and
application servers would definitely benefit from it, desktops could
easier use tmpfs as temporary file systems.

I never dared to do it with my limited time since I feared deadlock

Also I ended up that I would try to go one step further: Make the
index pages swappable, i.e. make the directory nodes normal tmpfs
files. This would even make the accounting right.


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