I found 2 problems at my platform.
1st is occured when I set CMA size 528MB and total memory is 960MB.
I print some values in adjust_managed_cma_page_count(),
the total value becomes 105439 and cma value 131072.
Finally movable value becomes negative value.
The total value 105439 means 411MB.
Is the zone->managed_pages value pages amount except the CMA?
I think zone->managed_pages value is including CMA size but it's value is strange.
2nd is a kernel panic at __netdev_alloc_skb().
I'm not sure it is caused by the CMA.
I'm checking it again and going to send you another report with detail call-stacks.
2014-05-30 오후 11:23, Joonsoo Kim 쓴 글:
2014-05-30 16:53 GMT+09:00 Gioh Kim <gioh.kim@xxxxxxx>:
Joonsoo,
I'm attaching a patch for combination of __rmqueue and __rmqueue_cma.
I didn't test fully but my board is turned on and working well if no frequent memory allocations.
I'm sorry to send not-tested code.
I just want to report this during your working hour ;-)
I'm testing this this evening and reporting next week.
Have a nice weekend!
Thanks Gioh. :)
-------------------------------------- 8< -----------------------------------------
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7f97767..9ced736 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -964,7 +964,7 @@ static int fallbacks[MIGRATE_TYPES][4] = {
[MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_R
#ifdef CONFIG_CMA
[MIGRATE_MOVABLE] = { MIGRATE_CMA, MIGRATE_RECLAIMABLE, MIGRATE_U
- [MIGRATE_CMA] = { MIGRATE_RESERVE }, /* Never used */
+ [MIGRATE_CMA] = { MIGRATE_MOVABLE, MIGRATE_RECLAIMABLE, MIGRATE_U
I don't want to use __rmqueue_fallback() for CMA.
__rmqueue_fallback() takes big order page rather than small order page
in order to steal large amount of pages and continue to use them in
next allocation attempts.
We can use CMA pages on limited cases, so stealing some pages from
other migrate type
to CMA type isn't good idea to me.
Thanks.
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