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From: Paul Jackson <pj@sgi.com>
To: Eric Dumazet <dada1@cosmosbay.com>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org,
	nickpiggin@yahoo.com.au, Simon.Derr@bull.net, ak@suse.de,
	clameter@sgi.com
Subject: Re: [PATCH] Cpuset: rcu optimization of page alloc hook
Date: Tue, 13 Dec 2005 13:44:19 -0800	[thread overview]
Message-ID: <20051213134419.175821cd.pj@sgi.com> (raw)
In-Reply-To: <439EF75D.50206@cosmosbay.com>

Eric wrote:
> I do think we should have defined a special section for very hot (and written) 
> spots. It's more easy to locate thos hot spots than 'mostly read and shared by 
> all cpus without cache ping pongs' places...

Should we do something like:
 1) identify the hot write spots, to arrange them by access pattern,
	as Christoph considered, in another reply on this thread.
 2) identify the hot read, cold write spots, to bunch them up away from (1)
 3) leave the rest as "inert filler" (aka "cannon fodder", in my previous
	reply), but unmarked in any case.
 4) change the word "__read_mostly" to "__hot_read_cold_write", to more
	accurately fit item (2).

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@sgi.com> 1.925.600.0401

  parent reply	other threads:[~2005-12-13 21:44 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-12-11 23:31 [PATCH] Cpuset: rcu optimization of page alloc hook Paul Jackson
2005-12-12  3:29 ` Andi Kleen
2005-12-12  6:11   ` Paul Jackson
2005-12-12  6:21     ` Andi Kleen
2005-12-12  6:50       ` Paul Jackson
2005-12-12  8:49 ` Eric Dumazet
2005-12-12  8:54   ` Nick Piggin
2005-12-12  9:06     ` Eric Dumazet
2005-12-12  9:11     ` Andrew Morton
2005-12-12  9:38       ` Nick Piggin
2005-12-12 10:02   ` Paul Jackson
2005-12-12 10:12     ` Andrew Morton
2005-12-13 15:53       ` Paul Jackson
2005-12-13 16:31         ` Eric Dumazet
2005-12-13 17:42           ` Christoph Lameter
2005-12-13 17:56             ` Eric Dumazet
2005-12-13 18:07               ` Christoph Lameter
2005-12-13 21:03               ` Paul Jackson
2005-12-13 21:16                 ` Christoph Lameter
2005-12-13 21:38                 ` Eric Dumazet
2005-12-13 22:23                   ` Paul Jackson
2005-12-13 22:29                     ` Christoph Lameter
2005-12-14  3:54                     ` Paul Jackson
2005-12-14  4:02                       ` Andi Kleen
2005-12-14  4:06                         ` Paul Jackson
2005-12-14  8:06                     ` Eric Dumazet
2005-12-14  8:40                       ` Paul Jackson
2005-12-13 20:08           ` Paul Jackson
2005-12-13 20:29             ` Eric Dumazet
2005-12-13 22:35               ` Paul Jackson
2005-12-13 21:44           ` Paul Jackson [this message]
2005-12-13 17:37         ` Christoph Lameter

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