On Mon, Feb 16, 2026 at 10:43 PM Tejun Heo <[email protected]> wrote: > > On Thu, Feb 12, 2026 at 01:58:11PM -0800, T.J. Mercier wrote: > > This series adds support for IN_DELETE_SELF and IN_IGNORED inotify > > events to kernfs files. > > > > Currently, kernfs (used by cgroup and others) supports IN_MODIFY events > > but fails to notify watchers when the file is removed (e.g. during > > cgroup destruction). This forces userspace monitors to maintain resource > > intensive side-channels like pidfds, procfs polling, or redundant > > directory watches to detect when a cgroup dies and a watched file is > > removed. > > > > By generating IN_DELETE_SELF events on destruction, we allow watchers to > > rely on a single watch descriptor for the entire lifecycle of the > > monitored file, reducing resource usage (file descriptors, CPU cycles) > > and complexity in userspace. > > > > The series is structured as follows: > > Patch 1 refactors kernfs_elem_attr to support arbitrary event types. > > Patch 2 implements the logic to generate DELETE_SELF and IGNORED events > > on file removal. > > Patch 3 adds selftests to verify the new behavior. > > The patchset looks good to me. > > Acked-by: Tejun Heo <[email protected]> > > Thanks. > > -- > tejun
Thanks Tejun. Amir would prefer I remove the new DELETE event support and keep only the part for DELETE_SELF + IGNORED since adding only DELETE would create an asymmetry with the missing CREATE support. So I will plan to do that in V3 for this series. Thanks, T.J.
