On Wed, Aug 04, 2021 at 10:58:01AM -0700, Bart Van Assche wrote: > On 8/3/21 10:35 PM, Christoph Hellwig wrote: >> On Tue, Aug 03, 2021 at 11:23:03AM -0700, Bart Van Assche wrote: >>> We noticed that the user interface of Android devices becomes very slow >>> under memory pressure. This is because Android uses the zram driver on top >>> of the loop driver for swapping, >> >> Sorry, but that is just amazingly stupid. If you really want to swap >> to compressed files introduce that support in the swap code instead of >> coming up with dumb driver stacks from hell. > > Hi Christoph, > > That's an interesting suggestion. We can look into adding compression > support in the swap code. As a short term fix you might also just look into having a file backing for the zram writeback mode, which should not need more than 100-200 lines of code. > Independent of the use case of this patch, is it acceptable to change the > default I/O scheduler of loop devices from mq-deadline into none (patches 1 > and 2 of this series)? Yes, that might not be a bad idea in general.
