Re: [PATCH] Dynamically allocated pageflags

[Nigel Cunningham <ncunningham@cyclades.com>]

Hi.

On Thursday 02 February 2006 23:31, Andi Kleen wrote:
> On Thursday 02 February 2006 12:11, Nigel Cunningham wrote:
> > Hi everyone.
> > 
> > This is my latest revision of the dynamically allocated pageflags patch.
> > 
> > The patch is useful for kernel space applications that sometimes need to flag
> > pages for some purpose, but don't otherwise need the retain the state. A prime
> > example is suspend-to-disk, which needs to flag pages as unsaveable, allocated
> > by suspend-to-disk and the like while it is working, but doesn't need to
> > retain any of this state between cycles.
> 
> It looks like total overkill for a simple problem to me. And is there really
> any other user of this other than swsusp?

Sorry for the slow response. I switched email clients and gained a bogus
filter along the way (entirely my fault, of course).

As Dave said, he might make use of them too. I use about 5 or 6 of these,
depending upon exactly how Suspend2 is configured.

In the meanwhile, AKPM gave me a suggestion for a better solution
(radix-trees). My algorithms & data-structures course was 14 years ago,
so I'll go dust off Kingston (IIRC) and learn what he's talking about again :)

Thanks for the feedback and regards,

Nigel

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