On Wed, Sep 18, 2019 at 08:31:18PM +0000, Saeed Karimabadi (skarimab) wrote: > Hi Kernel Maintainers, > > We are chasing an issue where slab allocator is not releasing task_struct slab objects allocated by cgroups > and we are wondering if this is a known issue or an expected behavior ? > If we stress test the system and spawn multiple tasks with different cgroups, number of active allocated > task_struct objects will increase but kernel will never release those memory later on, even though if system > goes to the idle state with lower number of the running processes. Hi Saeed! I've recently proposed a new slab memory cgroup controller, which aims to solve the problem you're describing: https://lwn.net/Articles/798605/ . It also generally reduces the amount of memory used by slabs. I've been told that not all e-mails in the patchset reached lkml, so, please, find the original patchset here: https://github.com/rgushchin/linux/tree/new_slab.rfc and it's backport to the 5.3 release here: https://github.com/rgushchin/linux/tree/new_slab.rfc.v5.3 If you can try it on your setup, I'd appreciate it a lot, and it also can help with merging it upstream soon. Thank you! Roman
