Re: kswapd0: excessive CPU usage

Jiri Slaby
2012-10-11T22:08:20Z

On 10/11/2012 08:19 PM, Valdis.Kletnieks@vt.edu wrote:
> # zgrep COMPAC /proc/config.gz
> CONFIG_COMPACTION=y
>
> Hope that tells you something useful.

It just supports my another theory. This seems to fix it for me:
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1830,8 +1830,8 @@ static inline bool should_continue_reclaim(struct
lruvec *lruvec,
*/
pages_for_compaction = (2UL << sc->order);

- pages_for_compaction = scale_for_compaction(pages_for_compaction,
- lruvec, sc);
+/* pages_for_compaction = scale_for_compaction(pages_for_compaction,
+ lruvec, sc);*/
inactive_lru_pages = get_lru_size(lruvec, LRU_INACTIVE_FILE);
if (nr_swap_pages > 0)
inactive_lru_pages += get_lru_size(lruvec,
LRU_INACTIVE_ANON);

And for you?

(It's an effective revert of "mm: vmscan: scale number of pages
reclaimed by reclaim/compaction based on failures".)

regards,
--
js
suse labs