On Mon, Jul 26, 2021 at 10:33 PM Vasily Averin [off-list ref] wrote:

fasync_struct is used by almost all character device drivers to set up
the fasync queue, and for regular files by the file lease code.
This structure is quite small but long-living and it can be assigned
for any open file.

It makes sense to account for its allocations to restrict the host's
memory consumption from inside the memcg-limited container.

Signed-off-by: Vasily Averin <redacted>

Reviewed-by: Shakeel Butt <redacted>