linux-kernel - Re: [PATCH] BTRFS: Transpose parent_objectid and parent_gen in struct btrfs

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Message-ID: <30514.1237397915@redhat.com>
Date:	Wed, 18 Mar 2009 17:38:35 +0000
From:	David Howells <dhowells@...hat.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	dhowells@...hat.com, Chris Mason <chris.mason@...cle.com>,
	balajirrao@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] BTRFS: Transpose parent_objectid and parent_gen in struct btrfs_fid

David Woodhouse <dwmw2@...radead.org> wrote:

> But this struct is packed anyway -- we're not changing much on the wire;
> it's just a case of how efficient it is to load that single uint64_t
> from an unaligned location. Is that _really_ something we're ever going
> to notice?

If the CPU doing the load/store throws a misalignment exception or just
ignores the instruction because it's misaligned, it might make for interesting
debugging.

David
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