[RFC PATCH 0/3] Helpers for debugging dying cgroups

[Yakunin, Dmitry (Nebius)]

This patch series is mostly based on Konstantin's patches which he had sent
years ago [1].

This functionality still seems very useful for debugging the difference
between entities in cgroupfs and counters in /proc/cgroups, e.g.
searching for files that have page cache which prevents destruction of memcg.

I saw the comments in the original thread but didn't understand the Tejun's
comment about usage of filehandle instead of ino. Also I saved the original
output format in debugfs with extra counters. We can rework this format in
the future but now it seems straightforward for just filtering through
cmdline utilities.

[1] https://lore.kernel.org/lkml/153414348591.737150.14229960913953276515.stgit@buzz/

Dmitry Yakunin (3):
  cgroup: list all subsystem states in debugfs files
  proc/kpagecgroup: report also inode numbers of offline cgroups
  tools/mm/page-types: add flag for showing inodes of offline cgroups

 fs/proc/page.c              |  24 ++++++++-
 include/linux/cgroup-defs.h |   1 +
 include/linux/memcontrol.h  |   2 +-
 kernel/cgroup/cgroup.c      | 101 ++++++++++++++++++++++++++++++++++++
 mm/memcontrol.c             |  19 ++++++-
 mm/memory-failure.c         |   2 +-
 tools/mm/page-types.c       |  18 ++++++-
 7 files changed, 159 insertions(+), 8 deletions(-)

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2.25.1