On Thu, Aug 21, 2025 at 06:37:51PM -0700, Tiffany Yang wrote: > Hello, > > The cgroup v2 freezer controller is useful for freezing background > applications so they don't contend with foreground tasks. However, this > may disrupt any internal monitoring that the application is performing, > as it may not be aware that it was frozen. > > To illustrate, an application might implement a watchdog thread to > monitor a high-priority task by periodically checking its state to > ensure progress. The challenge is that the task only advances when the > application is running, but watchdog timers are set relative to system > time, not app time. If the app is frozen and misses the expected > deadline, the watchdog, unaware of this pause, may kill a healthy > process. > > This series tracks the time that each cgroup spends "freezing" and > exposes it via cgroup.stat.local. Include several basic selftests to > demonstrate the expected behavior of this interface, including that: > 1. Freeze time will increase while a cgroup is freezing, regardless of > whether it is frozen or not. > 2. Each cgroup's freeze time is independent from the other cgroups in > its hierarchy. > > Thanks, > Tiffany > > Signed-off-by: Tiffany Yang <ynaffit@xxxxxxxxxx> Applied to cgroup/for-6.18. Let's address further issues incrementally. Thanks. -- tejun
