On Mon, 2012-03-19 at 14:04 +0100, Andrea Arcangeli wrote:

If you boot with memcg compiled in, that's taking an equivalent amount
of memory per-page.

If you can bear the memory loss when memcg is compiled in even when
not enabled, you sure can bear it on NUMA systems that have lots of
memory, so it's perfectly ok to sacrifice a bit of it so that it
performs like not-NUMA but you still have more memory than not-NUMA.

I think the overhead of memcg is quite insane as well. And no I cannot
bear that and have it disabled in all my kernels.

NUMA systems having lots of memory is a false argument, that doesn't
mean we can just waste tons of it, people pay good money for that
memory, they want to use it.

I fact, I know that HPC people want things like swap-over-nfs so they
can push infrequently running system crap out into swap so they can get
these few extra megabytes of memory. And you're proposing they give up
~100M just like that?

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