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Date:	Thu, 23 Oct 2014 17:15:44 +0900
From:	Joonsoo Kim <>
Subject: Re: +
 added to -mm tree

On Tue, Oct 14, 2014 at 01:53:44PM -0700, wrote:
> The patch titled
>      Subject: mm/compaction.c: avoid premature range skip in isolate_migratepages_range
> has been added to the -mm tree.  Its filename is
>      mm-compaction-avoid-premature-range-skip-in-isolate_migratepages_range.patch
> This patch should soon appear at
> and later at
> Before you just go and hit "reply", please:
>    a) Consider who else should be cc'ed
>    b) Prefer to cc a suitable mailing list as well
>    c) Ideally: find the original patch on the mailing list and do a
>       reply-to-all to that, adding suitable additional cc's
> *** Remember to use Documentation/SubmitChecklist when testing your code ***
> The -mm tree is included into linux-next and is updated
> there every 3-4 working days
> ------------------------------------------------------
> From: Joonsoo Kim <>
> Subject: mm/compaction.c: avoid premature range skip in isolate_migratepages_range
> commit edc2ca612496 ("mm, compaction: move pageblock checks up from
> isolate_migratepages_range()") commonizes isolate_migratepages variants
> and make them use isolate_migratepages_block().
> isolate_migratepages_block() could stop the execution when enough pages
> are isolated, but, there is no code in isolate_migratepages_range() to
> handle this case.  In the result, even if isolate_migratepages_block()
> returns prematurely without checking all pages in the range,
> isolate_migratepages_block() is called repeately on the following
> pageblock and some pages in the previous range are skipped to check.
> Then, CMA is failed frequently due to this fact.
> To fix this problem, this patch let isolate_migratepages_range() know the
> situation that enough pages are isolated and stop the isolation in that
> case.
> Note that isolate_migratepages() has no such problem, because, it always
> stops the isolation after just one call of isolate_migratepages_block().
> Signed-off-by: Joonsoo Kim <>
> Cc: Vlastimil Babka <>
> Cc: David Rientjes <>
> Cc: Minchan Kim <>
> Cc: Michal Nazarewicz <>
> Cc: Naoya Horiguchi <>
> Cc: Christoph Lameter <>
> Cc: Rik van Riel <>
> Cc: Mel Gorman <>
> Cc: Zhang Yanfei <>
> Signed-off-by: Andrew Morton <>

Hello, Andrew.

I forgot to mention that this should be merged for v3.18. :)

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