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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230911075437.74027-1-zeil@nebius.com>
Date:   Mon, 11 Sep 2023 07:55:09 +0000
From:   "Yakunin, Dmitry (Nebius)" <zeil@...ius.com>
To:     "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
CC:     NB-Core Team <NB-CoreTeam@...ius.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        "mhocko@...nel.org" <mhocko@...nel.org>,
        "Yakunin, Dmitry (Nebius)" <zeil@...ius.com>
Subject: [RFC PATCH 0/3] Helpers for debugging dying cgroups

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(-)

-- 
2.25.1