6.1-stable review patch. If anyone has any objections, please let me know.
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From: Greg Kroah-Hartman gregkh@linuxfoundation.org
This reverts commit 21ef9e11205fca43785eecf7d4a99528d4de5701 which is commit 86327e8eb94c52eca4f93cfece2e29d1bf52acbf upstream.
It breaks existing runc systems, as the tool always thinks the file should be present.
Reported-by: Jeremi Piotrowski jpiotrowski@linux.microsoft.com Link: https://lore.kernel.org/r/20230920081101.GA12096@linuxonhyperv3.guj3yctzbm1e... Cc: Michal Hocko mhocko@suse.com Cc: Shakeel Butt shakeelb@google.com Cc: Johannes Weiner hannes@cmpxchg.org Cc: Roman Gushchin roman.gushchin@linux.dev Cc: Muchun Song muchun.song@linux.dev Cc: Tejun Heo tj@kernel.org Cc: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Documentation/admin-guide/cgroup-v1/memory.rst | 2 ++ mm/memcontrol.c | 10 ++++++++++ 2 files changed, 12 insertions(+)
--- a/Documentation/admin-guide/cgroup-v1/memory.rst +++ b/Documentation/admin-guide/cgroup-v1/memory.rst @@ -91,6 +91,8 @@ Brief summary of control files. memory.oom_control set/show oom controls. memory.numa_stat show the number of memory usage per numa node + memory.kmem.limit_in_bytes This knob is deprecated and writing to + it will return -ENOTSUPP. memory.kmem.usage_in_bytes show current kernel memory allocation memory.kmem.failcnt show the number of kernel memory usage hits limits --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3841,6 +3841,10 @@ static ssize_t mem_cgroup_write(struct k case _MEMSWAP: ret = mem_cgroup_resize_max(memcg, nr_pages, true); break; + case _KMEM: + /* kmem.limit_in_bytes is deprecated. */ + ret = -EOPNOTSUPP; + break; case _TCP: ret = memcg_update_tcp_max(memcg, nr_pages); break; @@ -5052,6 +5056,12 @@ static struct cftype mem_cgroup_legacy_f }, #endif { + .name = "kmem.limit_in_bytes", + .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT), + .write = mem_cgroup_write, + .read_u64 = mem_cgroup_read_u64, + }, + { .name = "kmem.usage_in_bytes", .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE), .read_u64 = mem_cgroup_read_u64,