linux-kernel - Re: [RFC 1/5] meminfo: add a per node counter for balloon drivers

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Message-ID: <CAA1CXcCv20TW+Xgn18E0Jn1rbT003+3gR-KAxxE9GLzh=EHNmQ@mail.gmail.com>
Date: Wed, 12 Mar 2025 17:04:14 -0600
From: Nico Pache <npache@...hat.com>
To: David Hildenbrand <david@...hat.com>
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Subject: Re: [RFC 1/5] meminfo: add a per node counter for balloon drivers

On Wed, Mar 12, 2025 at 4:19 PM David Hildenbrand <david@...hat.com> wrote:
>
> On 12.03.25 01:06, Nico Pache wrote:
> > Add NR_BALLOON_PAGES counter to track memory used by balloon drivers and
> > expose it through /proc/meminfo and other memory reporting interfaces.
>
> In balloon_page_enqueue_one(), we perform a
>
> __count_vm_event(BALLOON_INFLATE)
>
> and in balloon_page_list_dequeue
>
> __count_vm_event(BALLOON_DEFLATE);
>
>
> Should we maybe simply do the per-node accounting similarly there?

I think the issue is that some balloon drivers use the
balloon_compaction interface while others use their own.

This would require unifying all the drivers under a single api which
may be tricky if they all have different behavior
>
> --
> Cheers,
>
> David / dhildenb
>