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Date: Tue, 05 Dec 2006 16:49:48 +1100 From: Nick Piggin <nickpiggin@...oo.com.au> To: Paul Mackerras <paulus@...ba.org> CC: Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org Subject: Re: -mm merge plans for 2.6.20 Paul Mackerras wrote: > Andrew Morton writes: >>radix-tree-rcu-lockless-readside.patch >> >> There's no reason to merge this yet. > > > We want to use it in some powerpc arch code. Currently we use a > per-cpu array of spinlocks, and this patch would let us get rid of > that array. I'd like to get another patch in here before going upstream if possible. It is not a correctness fix, but it is a bit of a rework. I also wouldn't mind getting the readahead path, if not the full pagecache readside, out from under tree_lock in -mm kernels to exercise the radix-tree concurrency a bit more. It's just been painfully slow, recently because of these more important buffered write vs deadlock and pagefault vs invalidate problems that I've been working on. I don't feel I can load up -mm with too much unrelated stuff that messes with mm/pagecache internals. I guess the per-cpu spinlocks are pretty reasonable for scalability, and you are mainly looking to eliminate the lock/unlock cost in your interrupt path? Nick -- SUSE Labs, Novell Inc. Send instant messages to your online friends http://au.messenger.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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