Re: [patch 00/14] Page cache cleanup in anticipation of Large Blocksize support

Matt Mackall
2007-06-17T05:03:22Z

On Sat, Jun 16, 2007 at 06:25:00PM -0700, Arjan van de Ven wrote:
>
> > You: conceptully-new add-on which benefits 0.25% of the user base, provided
> > they select the right config options and filesystem.
> >
> > Me: simpler enhancement which benefits 100% of the user base (ie: includes
> > 4k blocksize, 4k pagesize) and which also fixes your performance problem
> > with that HBA.
>
> note that at least 2.6 is doing this "sort of", better than 2.4 at
> least. (30% hitrate or something like that).

Is it? Last I looked it had reverted to handing out reverse-contiguous
pages.

You can see this by running /proc/pid/pagemap through hexdump.

--
Mathematics is the supreme nostalgia of our time.