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Date: Wed, 09 Aug 2006 02:34:49 +1000
From: Nick Piggin <nickpiggin@...oo.com.au>
To: Eric Dumazet <dada1@...mosbay.com>
CC: Ulrich Drepper <drepper@...il.com>, Andi Kleen <ak@...e.de>,
Ravikiran G Thirumalai <kiran@...lex86.org>,
"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
pravin b shelar <pravin.shelar@...softinc.com>,
linux-kernel@...r.kernel.org
Subject: Re: [RFC] NUMA futex hashing
Eric Dumazet wrote:
> We certainly can. But if you insist of using mmap sem at all, then we have a
> problem.
>
> rbtree would not reduce cacheline bouncing, so :
>
> We could use a hashtable (allocated on demand) of size N, N depending on
> NR_CPUS for example. each chain protected by a private spinlock. If N is well
> chosen, we might reduce lock cacheline bouncing. (different threads fighting
> on different private futexes would have a good chance to get different
> cachelines in this hashtable)
See other mail. We already have a hash table ;)
--
SUSE Labs, Novell Inc.
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