On Fri 03-08-18 14:11:26, Zhaoyang Huang wrote: > On Fri, Aug 3, 2018 at 1:48 PM Zhaoyang Huang <huangzhaoyang@xxxxxxxxx> wrote: > > > > for the soft_limit reclaim has more directivity than global reclaim, we40960 > > have current memcg be skipped to avoid potential page thrashing. > > > The patch is tested in our android system with 2GB ram. The case > mainly focus on the smooth slide of pictures on a gallery, which used > to stall on the direct reclaim for over several hundred > millionseconds. By further debugging, we find that the direct reclaim > spend most of time to reclaim pages on its own with softlimit set to > 40960KB. I add a ftrace event to verify that the patch can help > escaping such scenario. Furthermore, we also measured the major fault > of this process(by dumpsys of android). The result is the patch can > help to reduce 20% of the major fault during the test. I have asked already asked. Why do you use the soft limit in the first place? It is known to cause excessive reclaim and long stalls. -- Michal Hocko SUSE Labs
