[PATCH v2 09/10] iommu: observability of the IOMMU allocations

[David Rientjes]

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 at soleen.com>

Acked-by: David Rientjes <rientjes at google.com>