linux-kernel - Re: [PATCH v2 09/10] iommu: observability of the IOMMU allocations

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Message-ID: <CA+CK2bD-phEK4aWQv-xK74_uR_agRN+cmt5Wq-a8YVB1Gm_gVA@mail.gmail.com>
Date: Thu, 14 Dec 2023 14:18:49 -0500
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: David Rientjes <rientjes@...gle.com>
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Subject: Re: [PATCH v2 09/10] iommu: observability of the IOMMU allocations

On Thu, Dec 14, 2023 at 12:59 PM David Rientjes <rientjes@...gle.com> wrote:
>
> On Thu, 30 Nov 2023, Pasha Tatashin wrote:
>
> > Add NR_IOMMU_PAGES into node_stat_item that counts number of pages
> > that are allocated by the IOMMU subsystem.
> >
> > The allocations can be view per-node via:
> > /sys/devices/system/node/nodeN/vmstat.
> >
> > For example:
> >
> > $ grep iommu /sys/devices/system/node/node*/vmstat
> > /sys/devices/system/node/node0/vmstat:nr_iommu_pages 106025
> > /sys/devices/system/node/node1/vmstat:nr_iommu_pages 3464
> >
> > The value is in page-count, therefore, in the above example
> > the iommu allocations amount to ~428M.
> >
> > Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
>
> Acked-by: David Rientjes <rientjes@...gle.com>

Thank you,
Pasha