On Mon, Nov 23, 2015 at 03:22:31PM +0300, Vladimir Davydov wrote: > When the memory.high threshold is exceeded, try_charge() schedules a > task_work to reclaim the excess. The reclaim target is set to the number > of pages requested by try_charge(). This is wrong, because try_charge() > usually charges more pages than requested (batch > nr_pages) in order to > refill per cpu stocks. As a result, a process in a cgroup can easily > exceed memory.high significantly when doing a lot of charges w/o > returning to userspace (e.g. reading a file in big chunks). > > Fix this issue by assuring that when exceeding memory.high a process > reclaims as many pages as were actually charged (i.e. batch). > > Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>