From: Kyungmin Park <kmpark@infradead.org>
To: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Marek Szyprowski <m.szyprowski@samsung.com>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH] mm: cma: Discard clean pages during contiguous allocation instead of migration
Date: Tue, 11 Sep 2012 20:23:14 +0900 [thread overview]
Message-ID: <CAH9JG2V-ATcfe5_YkH6sMmm5UZFHt2SYBWnCNSpfsncGFU96mg@mail.gmail.com> (raw)
In-Reply-To: <xa1tehm8yfmb.fsf@mina86.com>
On 9/11/12, Michal Nazarewicz <mina86@mina86.com> wrote:
>
> On Tue, Sep 11 2012, Minchan Kim wrote:
>> This patch drops clean cache pages instead of migration during
>> alloc_contig_range() to minimise allocation latency by reducing the
>> amount
>> of migration is necessary. It's useful for CMA because latency of
>> migration
>> is more important than evicting the background processes working set.
>> In addition, as pages are reclaimed then fewer free pages for migration
>> targets are required so it avoids memory reclaiming to get free pages,
>> which is a contributory factor to increased latency.
>>
>> * from v1
>> * drop migrate_mode_t
>> * add reclaim_clean_pages_from_list instad of MIGRATE_DISCARD support -
>> Mel
>>
>> I measured elapsed time of __alloc_contig_migrate_range which migrates
>> 10M in 40M movable zone in QEMU machine.
>>
>> Before - 146ms, After - 7ms
>>
>> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
>> Cc: Michal Nazarewicz <mina86@mina86.com>
>
> Acked-by: Michal Nazarewicz <mina86@mina86.com>
Tested-by: Kyungmin Park <kyungmin.park@samsung.com>
>
> Thanks!
>
> --
> Best regards, _ _
> .o. | Liege of Serenely Enlightened Majesty of o' \,=./ `o
> ..o | Computer Science, Michał “mina86” Nazarewicz (o o)
> ooo +----<email/xmpp: mpn@google.com>--------------ooO--(_)--Ooo--
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next prev parent reply other threads:[~2012-09-11 11:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-11 0:41 Minchan Kim
2012-09-11 8:59 ` Mel Gorman
2012-09-11 11:15 ` Michal Nazarewicz
2012-09-11 11:23 ` Kyungmin Park [this message]
2012-09-12 20:07 ` Andrew Morton
2012-09-12 23:58 ` Minchan Kim
2012-09-13 19:17 ` Geert Uytterhoeven
2012-09-13 22:19 ` Andrew Morton
2012-09-14 0:10 ` Minchan Kim
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