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Date: Thu, 13 Dec 2007 21:00:57 -0700 From: Matthew Wilcox <matthew@....cx> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Mark Lord <liml@....ca>, James.Bottomley@...senPartnership.com, jens.axboe@...cle.com, lkml@....ca, linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org, linux-mm@...ck.org, mel@....ul.ie Subject: Re: [PATCH] fix page_alloc for larger I/O segments On Thu, Dec 13, 2007 at 05:03:08PM -0800, Andrew Morton wrote: > + /* > + * Find a page of the appropriate migrate type. Doing a > + * reverse-order search here helps us to hand out pages in > + * ascending physical-address order. > + */ > + list_for_each_entry_reverse(page, &pcp->list, lru) It's not obvious why ascending physical order is a good thing. How about: + /* + * Find a page of the appropriate migrate type. Doing a + * reverse-order search here helps us to hand out pages in + * ascending physical-address order, which improves our + * chances of coalescing scatter-gather pages. + */ -- Intel are signing my paycheques ... these opinions are still mine "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- 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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