During the past weeks, it became clear to us that the shrinker interface we have right now works very well for some particular types of users, but not that well for others. The later are usually people interested in one-shot notifications, that were forced to adapt themselves to the count+scan behavior of shrinkers. To do so, they had no choice than to greatly abuse the shrinker interface producing little monsters all over. During LSF/MM, one of the proposals that popped out during our session was to reuse Anton Voronstsov's vmpressure for this. They are designed for userspace consumption, but also provide a well-stablished, cgroup-aware entry point for notifications. I am demonstrating this interface by registering a memcg event that tries to get rid of all dead caches in the system. We never used a shrinker for that because it didn't feel too natural. The new interface integrates quite nicely, though. Please note that due to my lack of understanding of each shrinker user, I will stay away from converting the actual users, you are all welcome to do so. Glauber Costa (2): vmpressure: in-kernel notifications memcg: reap dead memcgs under pressure include/linux/vmpressure.h | 6 ++++ mm/memcontrol.c | 81 ++++++++++++++++++++++++++++++++++++++++++++-- mm/vmpressure.c | 48 ++++++++++++++++++++++++--- 3 files changed, 128 insertions(+), 7 deletions(-) -- 1.8.1.4 -- 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>