On Sat, Sep 11, 2021 at 12:40 AM Vasily Averin <vvs@xxxxxxxxxxxxx> wrote: > > Linus proposes to revert an accounting for sops objects in > do_semtimedop() because it's really just a temporary buffer > for a single semtimedop() system call. > > This object can consume up to 2 pages, syscall is sleeping one, > size and duration can be controlled by user, and this allocation > can be repeated by many thread at the same time. > > However Shakeel Butt pointed that there are much more popular objects > with the same life time and similar memory consumption, the accounting > of which was decided to be rejected for performance reasons. > > In addition, any usual task consumes much more accounted memory, > so 2 pages of this temporal buffer can be safely ignored. > > Link: https://patchwork.kernel.org/project/linux-fsdevel/patch/20171005222144.123797-1-shakeelb@xxxxxxxxxx/ > > Fixes: 18319498fdd4 ("memcg: enable accounting of ipc resources") > Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx> Thanks Vasily. Acked-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
