linux-kernel - [ARM] Issue of memory compaction on kernel 2.6.35.9

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Date:	Wed, 13 Apr 2011 17:05:33 +0530
From:	naveen yadav <yad.naveen@...il.com>
To:	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	linux-arm-kernel-request@...ts.arm.linux.org.uk,
	linux newbie <linux.newbie79@...il.com>
Subject: [ARM] Issue of memory compaction on kernel 2.6.35.9

Dear all,

we want to varify compaction on ARM and we are  using 2.6.25.9 kernel
on cortex a9.

Since ARM does not have HUGETLB_PAGE support and compaction is HUGE
PAGE independent so I removed from config file

******************************************************************************************************************************
# support for memory compaction
config COMPACTION
        bool "Allow for memory compaction"
        select MIGRATION
        #depends on EXPERIMENTAL && HUGETLB_PAGE && MMU
        depends on EXPERIMENTAL && MMU
   help
          Allows the compaction of memory for the allocation of huge pages.	
******************************************************************************************************************************
after triggering Memory Compaction by writing any value to
/proc/sys/vm/compact_memory i am getting the SVC mode crash
******************************************************************************************************************************
#echo 1 > /proc/sys/vm/compact_memory
Unable to handle kernel paging request at virtual address ee420be4
pgd = d9c6c000
[ee420be4] *pgd=00000000
Internal error: Oops: 805 [#1] PREEMPT
last sysfs file:
Modules linked in:
CPU: 0    Not tainted  (2.6.35.9 #16)
PC is at compact_zone+0x178/0x610
LR is at compact_zone+0x138/0x610
pc : [<c009f30c>]    lr : [<c009f2cc>]    psr: 40000093
sp : d9d75e40  ip : c0380978  fp : d9d75e94
r10: d9d74000  r9 : c03806c8  r8 : 00069704
r7 : 00069800  r6 : 00d2e080  r5 : c04ea080  r4 : d9d75e9c
r3 : 60000093  r2 : 00000002  r1 : ee420be4  r0 : ee430b82
Flags: nZcv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment us	
******************************************************************************************************************************


We  tried to narrow down the prob... I found crash is form
“del_page_from_lru_list(zone, page, page_lru(page)); ” function
isolate_migratepages

{
-----------
/* Successfully isolated */
		del_page_from_lru_list(zone, page, page_lru(page));

	--------------------------------------------------
}

In my ARM board have only one zone (Node 0, zone   Normal)

******************************************************************************************************************************
VDLinux#> cat /proc/buddyinfo
Node 0, zone   Normal      5      4      4      2      1      3      0
     2       3      4      2      1      7
******************************************************************************************************************************

Can some one guide why I am geeting the crash and how to debugg this problem


Thanks
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