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

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Message-ID: <ZBOsyBu68d4vh6yU@bombadil.infradead.org>
Date:   Thu, 16 Mar 2023 16:56:56 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        pmladek@...e.com, petr.pavlu@...e.com, prarit@...hat.com,
        christophe.leroy@...roup.eu, song@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: [RFC 00/12] module: avoid userspace pressure on unwanted
 allocations

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