Hello, Jeff.

On Tue, Dec 05, 2017 at 10:41:11AM -0500, Jeff Moyer wrote:

Kirill Tkhai [off-list ref] writes:

quoted

quoted

I think you just need to account the completion ring.

A request of struct aio_kiocb type consumes much more memory, than
struct io_event does. Shouldn't we account it too?

Not in my opinion.  The completion ring is the part that gets pinned for
long periods of time.

For memcg, it should account all possibly significant memory
consumptions whether long term or transitional.  Otherwise, isolation
doesn't really work that well.

Just be sure to document this where appropriate.  Users/admins should
know that the aio completion ring now contributes to their memory
budget.

Yeah, the memory section in cgroup-v2.txt does have a section for
this.

Thanks.

-- 
tejun