Re: [RFC 00/12] module: avoid userspace pressure on unwanted allocations

From: Luis Chamberlain
Date: Thu Mar 16 2023 - 19:57:01 EST


On Thu, Mar 16, 2023 at 04:55:31PM -0700, Luis Chamberlain wrote:
> On Wed, Mar 15, 2023 at 05:41:53PM +0100, David Hildenbrand wrote:
> > I expect to have a machine (with a crazy number of CPUs/devices) available
> > in a couple of days (1-2), so no need to rush.
> >
> > The original machine I was able to reproduce with is blocked for a little
> > bit longer; so I hope the alternative I looked up will similarly trigger the
> > issue easily.
>
> OK give this a spin:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git/log/?h=20230316-module-alloc-opts
>
> I'm seeing about ~86 MiB saving on the upper bound on memory usage
> while hammering on kmod test 0008, and this is on a small system.
>
> Probably won't help *that* much but am curious... if it helps somewhat.

How much cpu count BTW?

Luis