I know we've had latency issues in the past with memory cgroups. If there is a change in behavior in 5.16rt+ we can consider backporting down to 5.15-rt Clark On Wed, Jul 6, 2022 at 8:25 PM Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx> wrote: > > Hello, > > An end user reported a bug[1] when attempting to use an Ubuntu kernel with the 5.15 real-time patches applied. The user reports an issue with missing cg memory when Kubernetes is used with the 5.15 patchset. > > After an investigation, it was found the issue is happens if the CONFIG_MEMCG config is not enabled. That config is usually enabled for the generic Ubuntu kernel. However, the config is disabled by the following patch in the 5.15 real-time patch set: > > [PATCH 098/167] mm/memcontrol: Disable on PREEMPT_RT > > I don't see this patch in the 5.16 and newer patch sets. Is there a fix in mainline or in the newer 5.16 patches that allows the 'mm/memcontrol: Disable on PREEMPT_RT' patch to be dropped? If so, I could assist with backporting the fix to 5.15 and older. > > Thanks in advance! > > Joe > > > > [0] https://bugs.launchpad.net/ubuntu-realtime/+bug/1978814 > > >
