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Date: Thu, 16 Dec 2010 18:46:41 -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: >> You called it a "header page". Does that imply that it is page sized? Hugh> Yes. (Rather a nuisance on a PowerPC system which sometimes uses Hugh> a kernel with 4k pages and sometimes a kernel with 64k pages.) Ok. >> Or will it cause pages written to a 4k-aligned swap device to be >> misaligned? Hugh> No, the 4k-aligned remains 4k-aligned, of course. But if you Hugh> aligned your swap partition on, say, a 1MB boundary, and are Hugh> thinking of working in aligned 1MB blocks, then it may be awkward Hugh> that there's always this special 4k at the start (it could be Hugh> written back each time even though it hasn't changed, but it's Hugh> still an odd case). Yeah, I got that. I just wanted to make sure that the header was not 32 bytes or something like that because that would be highly painful from an I/O alignment perspective. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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