linux-kernel - Re: [PATCH v1 0/2] powerpc/pseries/cmm: two smaller fixes

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Message-ID: <89b5b9e7-d8c1-4402-9fe6-b312630b3d50@kernel.org>
Date: Fri, 28 Nov 2025 12:45:58 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
 linux-kernel@...r.kernel.org
Cc: linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
 Andrew Morton <akpm@...ux-foundation.org>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>
Subject: Re: [PATCH v1 0/2] powerpc/pseries/cmm: two smaller fixes

On 11/28/25 11:40, Ritesh Harjani (IBM) wrote:
> "David Hildenbrand (Red Hat)" <david@...nel.org> writes:
> 
>>>>
>>>> Right. Let me give it a try first with pseries Qemu. Otherwise I have an
>>>> access to pseries LPAR too. I can verify it there.
>>>
>>> Ah, now I realize my problem: I tried with Fedora 43 in a powerpc VM but
>>> the modprobe didn't do anything.
>>>
>>> Looking again:
>>>
>>> # grep CONFIG_CMM /boot/config-6.17.1-300.fc43.ppc64le
>>> CONFIG_CMM=y
>>>
>>> So modprob'ing won't do as the module is built in.
>>
>> Right, so doing "cmm.simulate=1" on the cmdline in a Fedora 43 VMs
>> properly creates the CMM device.
>>
> 
> Right verifying using simulate mode is very straightforward. Thanks for that!
> So.. using various random echo X > simulate_loan_target_kb on a VM...
> 
> ~# cat /proc/vmstat |grep balloon
> nr_balloon_pages 16
> balloon_inflate 1638
> balloon_deflate 1622
> balloon_migrate 4

Thanks a bunch for the review and testing!

-- 
Cheers

David