On Fri, 19 Dec 2008 08:53:28 +0100 Nick Piggin [off-list ref] wrote:

On Thu, Dec 18, 2008 at 11:35:49PM -0800, Andrew Morton wrote:

quoted

On Fri, 19 Dec 2008 08:29:09 +0100 Nick Piggin [off-list ref] wrote:

quoted

Introduce a new page flag, PG_waiters

Leaving how many?

Don't know...

Need to know!  page.flags is prime real estate and we should decide
whether gaining 2% in a particular microbenchmark is our best use of it

I thought the page-flags.h obfuscation project was
supposed to make that clearer to work out. There are what, 21 flags
used now. If everything is coded properly, then the memory model
should automatically kick its metadata out of page flags if it gets
too big.

That would be nice :)

But most likely it will just blow up.

If we use them all _now_, as I proposed, we'll find out about that.

Probably we want
at least a few flags for memory model on 32-bit for smaller systems
(big NUMA 32-bit systems probably don't matter much anymore).

quoted

 fs-cache wants to take two more.

fs-cache is getting merged?

See thread titled "Pull request for FS-Cache, including NFS patches"

Wow, I've wanted to review that.

That would be good.


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