From: Andrew Morton <akpm@osdl.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: andrea@novell.com, linux-kernel@vger.kernel.org
Subject: Re: ZONE_PADDING wastes 4 bytes of the new cacheline
Date: Wed, 20 Oct 2004 21:36:22 -0700 [thread overview]
Message-ID: <20041020213622.77afdd4a.akpm@osdl.org> (raw)
In-Reply-To: <417728B0.3070006@yahoo.com.au>
Nick Piggin <nickpiggin@yahoo.com.au> wrote:
>
> > #if defined(CONFIG_SMP)
> > struct zone_padding {
> > - int x;
> > } ____cacheline_maxaligned_in_smp;
> > #define ZONE_PADDING(name) struct zone_padding name;
> > #else
>
> Perhaps to keep old compilers working? Not sure.
gcc-2.95 is OK with it.
Stock 2.6.9:
sizeof(struct zone) = 1920
With Andrea's patch:
sizeof(struct zone) = 1536
With ZONE_PADDING removed:
sizeof(struct zone) = 1408
next prev parent reply other threads:[~2004-10-21 4:47 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-21 1:17 ZONE_PADDING wastes 4 bytes of the new cacheline Andrea Arcangeli
2004-10-21 3:10 ` Nick Piggin
2004-10-21 4:36 ` Andrew Morton [this message]
2004-10-21 4:53 ` Nick Piggin
2004-10-21 10:51 ` Mikael Pettersson
2004-10-21 12:45 ` Andrea Arcangeli
2004-10-21 18:54 ` Adam Heath
2004-10-21 20:21 ` DaMouse
2004-10-21 21:24 ` Jon Masters
2004-10-22 10:09 ` DaMouse
2004-10-21 22:26 ` Nick Piggin
2004-10-21 22:45 ` Andrea Arcangeli
2004-10-22 0:34 ` Nick Piggin
2004-10-22 1:10 ` Andrea Arcangeli
2004-10-22 1:26 ` Andrew Morton
2004-10-22 2:55 ` Jesse Barnes
2004-10-22 3:38 ` Nick Piggin
2004-10-22 3:49 ` Jesse Barnes
2004-10-22 17:15 ` Andrea Arcangeli
2004-10-22 3:09 ` Nick Piggin
2004-10-22 3:26 ` Andrew Morton
2004-10-22 3:35 ` Nick Piggin
2004-10-22 17:13 ` Andrea Arcangeli
2004-10-22 17:07 ` Andrea Arcangeli
2004-10-22 15:50 ` Andrea Arcangeli
2004-10-22 3:02 ` Nick Piggin
2004-10-22 16:58 ` Andrea Arcangeli
2004-10-23 4:33 ` Nick Piggin
2004-10-23 9:59 ` Andrea Arcangeli
2004-10-23 10:22 ` Nick Piggin
2004-10-23 11:03 ` Andrea Arcangeli
2004-10-23 16:28 ` Nick Piggin
2004-10-25 12:44 ` Andrea Arcangeli
2004-10-25 12:49 ` Nick Piggin
2004-10-25 13:51 ` Andrea Arcangeli
2004-10-25 20:09 ` Robert White
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