Re: Minutes from Feb 21 LSE Call

Andrea Arcangeli
2003-02-25T20:20:16Z

On Tue, Feb 25, 2003 at 11:27:40AM -0800, Martin J. Bligh wrote:
> > the only solution is to do rmap lazily, i.e. to start building the rmap
> > during swapping by walking the pagetables, basically exactly like I
> > refill the lru with anonymous pages only after I start to need this
> > information recently in my 2.4 tree, so if you never need to pageout
> > heavily several giga of ram (like most of very high end numa servers),
> > you'll never waste a single cycle in locking or whatever other worthless
> > accounting overhead that hurts performance of all common workloads
>
> Did you see the partially object-based rmap stuff? I think that does
> very close to what you want already.

I don't see how it can optimize away the overhead but I didn't look at
it for long.

Andrea