linux-kernel - Re: swap storage alignment and stride size

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Message-ID: <yq18vzq6dgb.fsf@sermon.lab.mkp.net>
Date:	Wed, 15 Dec 2010 14:30:44 -0500
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Ric Wheeler <ricwheeler@...il.com>,
	Christian Brandt <brandtc@...5.com>,
	linux-kernel@...r.kernel.org, Mike Snitzer <snitzer@...hat.com>
Subject: Re: swap storage alignment and stride size

>>>>> "Hugh" == Hugh Dickins <hughd@...gle.com> writes:

Hugh> (scan_swap_map does try to allocate in 1MB clusters, but they're
Hugh> not written out that way, and there's no attempt to align: if it
Hugh> worked out better for the lower level to require that these 1MB
Hugh> clusters are aligned, we could probably go for that - though the
Hugh> swap header page might then be a nuisance.)

You called it a "header page". Does that imply that it is page sized?
Or will it cause pages written to a 4k-aligned swap device to be
misaligned?

-- 
Martin K. Petersen	Oracle Linux Engineering
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