From: "Iram Shahzad" <iram.shahzad@jp.fujitsu.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-mm@kvack.org
Subject: Re: compaction: why depends on HUGETLB_PAGE
Date: Fri, 30 Jul 2010 11:56:25 +0900 [thread overview]
Message-ID: <545904F46F6C4026A234512CEAED30AE@rainbow> (raw)
In-Reply-To: <20100729125725.GA3571@csn.ul.ie>
Mel Gorman wrote:
>> My question is: why does it depend on CONFIG_HUGETLB_PAGE?
>
> Because as the Kconfig says "Allows the compaction of memory for the
> allocation of huge pages.". Depending on compaction to satisfy other
> high-order allocation types is not likely to be a winning strategy.
Please could you elaborate a little more why depending on
compaction to satisfy other high-order allocation is not good.
>> Is it wrong to use it on ARM by disabling CONFIG_HUGETLB_PAGE?
>>
>
> It depends on why you need compaction. If it's for some device that
> requires high-order allocations (particularly if they are atomic), then
> it's not likely to work very well in the long term.
Would you please elaborate on this as well.
Many thanks for the reply
Iram
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next prev parent reply other threads:[~2010-07-30 2:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-29 1:53 Iram Shahzad
2010-07-29 12:57 ` Mel Gorman
2010-07-30 2:56 ` Iram Shahzad [this message]
2010-07-30 9:57 ` Mel Gorman
2010-07-30 16:44 Round Robinjp
2010-07-30 16:49 ` Mel Gorman
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