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

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Message-ID: <f65a5bca-ad5f-bd8d-e063-382c076924a8@redhat.com>
Date:   Mon, 20 Mar 2023 10:37:38 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
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 17.03.23 00:56, Luis Chamberlain wrote:
> 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?

220 physical ones and 440 virtual ones.

-- 
Thanks,

David / dhildenb