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From: Pintu Agarwal <pintu_agarwal@yahoo.com>
To: Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Memory allocation from ZONE_HIGHMEM ???
Date: Wed, 13 Jul 2011 23:45:25 -0700 (PDT)	[thread overview]
Message-ID: <1310625925.65469.YahooMailNeo@web162002.mail.bf1.yahoo.com> (raw)

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Hi,
 
I have a question regarding kernel memory allocation(using kmalloc) from ZONE_HIGHMEM zone.
 
I have a custom linux kernel2.6.36 running on linux mobile (arm cortexA9)
I have two zones on my system as shown by buddyinfo.
=====================================================
/opt/home/root # cat /proc/buddyinfo
Node 0, zone   Normal      2     32     22     14     12      4     12      3      0      1     23
Node 0, zone  HighMem    529    243    114     43     25     23     19     19     16     14     27
=====================================================
 
When I do memory allocation using kmalloc, the pages are allocated from Normal zone.
My allocation size is for order-10 pages = 23 * 1024 * PAGE_SIZE = 80MB
If I use more than that my allocation will fail which is obvious.
 
But I want to specifically allocate pages from ZONE_HIGHMEM instead of Normal zone.
How to explicitly do that in kernel?
 
If somebody have tried this please let me know.
 
 
 
Thanks, Regards,
Pintu

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             reply	other threads:[~2011-07-14  6:45 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-07-14  6:45 Pintu Agarwal [this message]
2011-07-14 19:34 ` Christoph Lameter

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