linux-kernel - Re: [PATCH 2/2] mm: support MIGRATE

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Date:	Fri, 7 Sep 2012 17:57:16 +0900
From:	Kyungmin Park <kmpark@...radead.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 2/2] mm: support MIGRATE_DISCARD

On 9/7/12, Minchan Kim <minchan@...nel.org> wrote:
> Hi Kyungmin,
>
> On Fri, Sep 07, 2012 at 04:31:17PM +0900, Kyungmin Park wrote:
>> On 9/7/12, Kyungmin Park <kmpark@...radead.org> wrote:
>> > Hi Minchan,
>> >
>> > I tested Mel patch again with ClearPageActive(page). but after some
>> > testing, it's stall and can't return from
>> > reclaim_clean_pages_from_list(&cc.migratepages).
>> >
>> > Maybe it's related with unmap feature from yours?
>> > stall is not happened from your codes until now.
>> >
>> > I'll test it more and report any issue if happened.
>> Updated. it's hang also. there are other issues.
>
> It was silly mistake in my patch and I suspect it fixes your issue
> because I guess you already tried below patch when you compiled and saw
> warning message.
> Anyway, if you see hang still after applying below patch,
> please enable CONFIG_DEBUG_VM and retest, if you find something, report it.
> I hope CONFIG_DEBUG_VM catch something.
>
> Thanks.
>
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 6668115..51d3f66 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5705,7 +5705,7 @@ static int __alloc_contig_migrate_range(unsigned long
> start, unsigned
>                         break;
>                 }
>
> -               reclaim_clean_pages_from_list(&cc.migratepages, cc.zone);
> +               reclaim_clean_pages_from_list(cc.zone, &cc.migratepages);
Of course, I tested it after local fix. and got the results as above.

Thank you,
Kyungmin Park
>                 ret = migrate_pages(&cc.migratepages,
>                                     __alloc_contig_migrate_alloc,
> (END)
>
>
> --
> Kind regards,
> Minchan Kim
>
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