From: William Lee Irwin III <wli@holomorphy.com>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cacheline align pagevec structure
Date: Thu, 9 Sep 2004 16:59:03 -0700 [thread overview]
Message-ID: <20040909235903.GQ3106@holomorphy.com> (raw)
In-Reply-To: <20040909221238.GA6182@logos.cnet>
On Thu, Sep 09, 2004 at 04:09:05PM -0700, William Lee Irwin III wrote:
>> Reducing arrival rates by an Omega(NR_CPUS) factor would probably help,
>> though that may blow the stack on e.g. larger Altixen. Perhaps
>> O(lg(NR_CPUS)), e.g. NR_CPUS > 1 ? 4*lg(NR_CPUS) : 4 etc., will suffice,
>> though we may have debates about how to evaluate lg(n) at compile-time...
>> Would be nice if calls to sufficiently simple __attribute__((pure))
>> functions with constant args were considered constant expressions by gcc.
On Thu, Sep 09, 2004 at 07:12:38PM -0300, Marcelo Tosatti wrote:
> Let me see if I get you right - basically what you're suggesting is
> to depend PAGEVEC_SIZE on NR_CPUS?
Yes. The motive is that as the arrival rate is O(num_cpus_online()), and
NR_CPUS is supposed to be strongly correlated with that, so reducing the
arrival rate by a (hopefully) similar factor ought to help.
-- wli
next prev parent reply other threads:[~2004-09-09 23:59 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-09 16:39 [PATCH] cacheline align pagevec structure Marcelo Tosatti
2004-09-09 22:49 ` Andrew Morton
2004-09-09 21:41 ` Marcelo Tosatti
2004-09-09 23:20 ` Andrew Morton
2004-09-09 22:52 ` Andrew Morton
2004-09-09 23:09 ` William Lee Irwin III
2004-09-09 22:12 ` Marcelo Tosatti
2004-09-09 23:59 ` William Lee Irwin III [this message]
2004-09-09 23:22 ` Andrew Morton
2004-09-10 0:07 ` [pagevec] resize pagevec to O(lg(NR_CPUS)) William Lee Irwin III
2004-09-10 4:56 ` Nick Piggin
2004-09-10 4:59 ` Nick Piggin
2004-09-10 17:49 ` Marcelo Tosatti
2004-09-12 0:29 ` Nick Piggin
2004-09-12 5:23 ` William Lee Irwin III
2004-09-12 4:36 ` Nick Piggin
2004-09-12 4:56 ` William Lee Irwin III
2004-09-12 4:28 ` Nick Piggin
2004-09-12 6:27 ` William Lee Irwin III
2004-09-12 6:03 ` Nick Piggin
2004-09-12 7:19 ` William Lee Irwin III
2004-09-12 7:42 ` Andrew Morton
2004-09-14 2:18 ` William Lee Irwin III
2004-09-14 2:57 ` Andrew Morton
2004-09-14 3:12 ` William Lee Irwin III
2004-09-12 8:57 ` William Lee Irwin III
2004-09-13 22:21 ` Marcelo Tosatti
2004-09-14 1:59 ` Nick Piggin
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