linux-kernel - Re: [PATCH v3 00/10] IOMMU memory observability

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Message-ID: <eqkpplwwyeqqd356ka3g6isaoboe62zrii77krsb7zwzmvdusr@5i3lzfhpt2xe>
Date: Thu, 4 Jan 2024 16:31:17 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
Cc: akpm@...ux-foundation.org, alim.akhtar@...sung.com, 
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Subject: Re: [PATCH v3 00/10] IOMMU memory observability

Hello.

On Tue, Dec 26, 2023 at 08:01:55PM +0000, Pasha Tatashin <pasha.tatashin@...een.com> wrote:
> This patch series solves this problem by adding both observability to
> all pages that are allocated by IOMMU, and also accountability, so
> admins can limit the amount if via cgroups.

Maybe this is a mismatch in vocabulary what you mean by the verb
"limit". But I don't see in the patchset that the offending pages would
be allocated with GFP_ACCOUNT. So the result is that the pages are
accounted (you can view the amount in memory.stat) but they are not
subject to memcg limits.

Is that what you intend?


Regards,
Michal

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