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

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Message-ID: <elsuzdcx2qpnazvz2ayzmco4ctms5ci3iet3k7ggbjt3p2pfk2@tvr3plow26oi>
Date: Fri, 5 Jan 2024 10:02:17 +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

On Thu, Jan 04, 2024 at 02:12:26PM -0500, Pasha Tatashin <pasha.tatashin@...een.com> wrote:
> Yes, we will have a difference between GFP_ACCOUNT and what
> NR_IOMMU_PAGES shows. GFP_ACCOUNT is set only where it makes sense to
> charge to user processes, i.e. IOMMU Page Tables, but there more IOMMU
> shared data that should not really be charged to a specific process.

I see. I'd suggest adding this explanation to commit 10/10 message
(perhaps with some ballpark numbers of pages). In order to have a
reference and understadning if someone decided to charge (and limit) all
in the future.

Thanks,
Michal

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