Messages in this thread | | | Date | Wed, 14 Feb 2007 10:57:00 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [patch] mm: NUMA replicated pagecache |
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On Tue, 13 Feb 2007, Nick Piggin wrote:
> Just tinkering around with this and got something working, so I'll see > if anyone else wants to try it. > > Not proposing for inclusion, but I'd be interested in comments or results.
We would be very interested in such a feature. We have another hack that shows up to 40% performance improvements.
> At the moment the code is a bit ugly, but it won't take much to make it a > completely standalone ~400 line module with just a handful of hooks into > the core mm. So if anyone really wants it, it could be quite realistic to > get into an includable form.
Would be great but I am a bit skeptical regarding the locking and the additonal overhead moving back and forth between replications and non replicated page state.
> At some point I did take a look at Dave Hansen's page replication patch for > ideas, but didn't get far because he was doing a per-inode scheme and I was > doing per-page. No judgments on which approach is better, but I feel this > per-page patch is quite neat.
Definitely looks better.
> - Would be nice to transfer master on reclaim. This should be quite easy, > must transfer relevant flags, and only if !PagePrivate (which reclaim > takes care of).
Transfer master? Meaning you need to remove the replicated pages? Removing of replicated pages should transfer reference bit?
> - Should go nicely with lockless pagecache, but haven't merged them yet.
When is that going to happen? Soon I hope? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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