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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