From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Andrea Arcangeli <andrea@suse.de>
Cc: Timur Tabi <ttabi@interactivesi.com>,
Linux MM mailing list <linux-mm@kvack.org>
Subject: Re: 2.4: why is NR_GFPINDEX so large?
Date: Thu, 22 Jun 2000 21:51:29 +0200 [thread overview]
Message-ID: <20000622215129.D28360@pcep-jamie.cern.ch> (raw)
In-Reply-To: <Pine.LNX.4.21.0006222124060.2692-100000@inspiron.random>; from andrea@suse.de on Thu, Jun 22, 2000 at 09:26:56PM +0200
Andrea Arcangeli wrote:
> >So I suppose the best way to optimize this is to make sure that
> >"NR_GFPINDEX * sizeof(zonelist_t)" is a multiple of the cache line size?
>
> Yes but only in SMP. On an UP compile you can save space. For this purpose
> in ac22-class there's a ____cacheline_aligned_in_smp macro that you can
> use for things like that (it relies on the compiler enterely).
Does ____cacheline_aligned_in_smp guarantee the _size_ of the object is
aligned, or merely its address?
You can always make an array of one element containing an aligned object
I suppose.
Longer term some variation of the per-CPU data area patch should be used.
If only it can be made nice :-)
-- jamie
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next prev parent reply other threads:[~2000-06-22 19:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-06-21 19:48 Timur Tabi
2000-06-21 19:56 ` Kanoj Sarcar
2000-06-21 19:57 ` Timur Tabi
2000-06-21 20:23 ` Puppetmaster
2000-06-21 20:37 ` Timur Tabi
2000-06-21 20:37 ` Kanoj Sarcar
2000-06-21 20:41 ` Timur Tabi
2000-06-21 20:49 ` Kanoj Sarcar
2000-06-21 20:59 ` Timur Tabi
2000-06-21 21:10 ` Kanoj Sarcar
2000-06-21 21:28 ` Timur Tabi
2000-06-21 21:41 ` Kanoj Sarcar
2000-06-21 21:43 ` Timur Tabi
2000-06-22 19:26 ` Andrea Arcangeli
2000-06-22 19:51 ` Jamie Lokier [this message]
2000-06-23 17:41 ` Andrea Arcangeli
2000-06-23 17:52 ` Jamie Lokier
2000-06-23 18:02 ` Andrea Arcangeli
2000-06-23 18:03 ` Andrea Arcangeli
2000-06-22 20:22 ` Kanoj Sarcar
2000-06-23 18:11 ` Andrea Arcangeli
2000-06-21 21:22 ` James Manning
2000-06-21 21:24 ` Juan J. Quintela
2000-06-21 21:15 frankeh
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