mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-05 14:40:12 -04:00
a75ffa2612
7775face20 ("memcg: killed threads should not invoke memcg OOM killer")
has added a bypass of the oom killer path for dying threads because a very
specific workload (described in the changelog) could hit "no killable
tasks" path. This itself is not fatal condition but it could be annoying
if this was a common case.
On the other hand the bypass has some issues on its own. Without
triggering oom killer we won't be able to trigger async oom reclaim
(oom_reaper) which can operate on killed tasks as well as long as they
still have their mm available. This could be the case during futex
cleanup when the memory as pointed out by Johannes in [1]. The said case
is still not fully understood but let's drop this bypass that was mostly
driven by an artificial workload and allow dying tasks to go into oom
path. This will make the code easier to reason about and also help corner
cases where oom_reaper could help to release memory.
Link: https://lore.kernel.org/all/20241212183012.GB1026@cmpxchg.org/T/#u [1]
Link: https://lkml.kernel.org/r/20250402090117.130245-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Suggested-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Rik van Riel <riel@surriel.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.