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Message-ID: <a36005b50703151409x311c2631n1bc10de67b6c6ede@mail.gmail.com> Date: Thu, 15 Mar 2007 13:09:35 -0800 From: "Ulrich Drepper" <drepper@...il.com> To: "Nick Piggin" <nickpiggin@...oo.com.au> Cc: "Eric Dumazet" <dada1@...mosbay.com>, "Andrew Morton" <akpm@...ux-foundation.org>, "Ingo Molnar" <mingo@...e.hu>, "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: [PATCH 2/3] FUTEX : introduce private hashtables On 3/15/07, Nick Piggin <nickpiggin@...oo.com.au> wrote: > There should be little contention on the memory in the global hash anyway, > because we can roughly reduce contention as a factor of hash-size/cacheline-size. > > What we will have are cache misses on the global table... but we're going to > get cache misses on those private tables as well. I'm thinking about NUMA cases. If you have private tables for a process which is pinned to some cluster in a NUMA machine the table is local to the node. If you have a global table you cannot optimize your application for such a situation because at least some of the pages of the global table are remote. - 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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