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Date: Mon, 19 May 2014 11:12:34 +0900 From: Joonsoo Kim <iamjoonsoo.kim@....com> To: Mel Gorman <mgorman@...e.de> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>, Marek Szyprowski <m.szyprowski@...sung.com>, Andrew Morton <akpm@...ux-foundation.org>, Rik van Riel <riel@...hat.com>, Johannes Weiner <hannes@...xchg.org>, Laura Abbott <lauraa@...eaurora.org>, Minchan Kim <minchan@...nel.org>, Heesub Shin <heesub.shin@...sung.com>, Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, Kyungmin Park <kyungmin.park@...sung.com>, Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>, 'Tomasz Stanislawski' <t.stanislaws@...sung.com> Subject: Re: [RFC PATCH 0/3] Aggressively allocate the pages on cma reserved memory On Thu, May 15, 2014 at 10:47:18AM +0100, Mel Gorman wrote: > On Thu, May 15, 2014 at 11:10:55AM +0900, Joonsoo Kim wrote: > > > That doesn't always prefer CMA region. It would be nice to > > > understand why grouping in pageblock_nr_pages is beneficial. Also in > > > your patch you decrement nr_try_cma for every 'order' allocation. Why ? > > > > pageblock_nr_pages is just magic value with no rationale. :) > > I'm not following this discussions closely but there is rational to that > value -- it's the size of a huge page for that architecture. At the time > the fragmentation avoidance was implemented this was the largest allocation > size of interest. Hello, Indeed. There is a such good rationale. Really thanks for informing it. Thanks. -- 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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