Messages in this thread | | | Date | Wed, 13 Apr 2011 17:05:33 +0530 | Subject | [ARM] Issue of memory compaction on kernel 2.6.35.9 | From | naveen yadav <> |
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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
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