linux-kernel - Re: [RFC] Disable auto_movable

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Message-ID: <eabe40da-0136-4bf0-973d-28f39d3053de@redhat.com>
Date: Mon, 28 Jul 2025 15:03:17 +0200
From: David Hildenbrand <david@...hat.com>
To: Michal Hocko <mhocko@...e.com>
Cc: Oscar Salvador <osalvador@...e.de>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, Hannes Reinecke <hare@...nel.org>
Subject: Re: [RFC] Disable auto_movable_ratio for selfhosted memmap

On 28.07.25 15:00, Michal Hocko wrote:
> On Mon 28-07-25 14:27:29, David Hildenbrand wrote:
> [...]
>>> I think the whole libdaxctl handling for onlining memory is based on that.
>>>
>>
>> Sorry, forgot to add a pointer:
>>
>> https://github.com/pmem/ndctl/blob/main/daxctl/lib/libdaxctl.c
> 
> Thanks for the pointer! I will have a look.

In particular daxctl_memory_op(), used to implement stuff like

daxctl online-memory
daxctl offline-memory
daxctl reconfigure-device (--no-online, --no-movable)


I am not sure if they also offline memory automatically before disabling 
a device.

But in essence, they want to to everything automatically as possible.

-- 
Cheers,

David / dhildenb