Hi Kyungmin,

On Fri, Sep 07, 2012 at 04:31:17PM +0900, Kyungmin Park wrote:

quoted

On 9/7/12, Kyungmin Park [off-list ref] wrote:

quoted

Hi Minchan,

I tested Mel patch again with ClearPageActive(page). but after some
testing, it's stall and can't return from
reclaim_clean_pages_from_list(&cc.migratepages).

Maybe it's related with unmap feature from yours?
stall is not happened from your codes until now.

I'll test it more and report any issue if happened.

Updated. it's hang also. there are other issues.

It was silly mistake in my patch and I suspect it fixes your issue
because I guess you already tried below patch when you compiled and saw
warning message.
Anyway, if you see hang still after applying below patch,
please enable CONFIG_DEBUG_VM and retest, if you find something, report it.
I hope CONFIG_DEBUG_VM catch something.

Thanks.

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6668115..51d3f66 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c

@@ -5705,7 +5705,7 @@ static int __alloc_contig_migrate_range(unsigned long

start, unsigned
                        break;
                }

-               reclaim_clean_pages_from_list(&cc.migratepages, cc.zone);
+               reclaim_clean_pages_from_list(cc.zone, &cc.migratepages);