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| author | Pasha Tatashin <pasha.tatashin@soleen.com> | 2024-04-13 03:25:21 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2024-04-15 15:31:47 +0300 |
| commit | bd3520a93a84cd8c3897283e5891a9106fcf5acc (patch) | |
| tree | 664e71aad879fc1e588f25f29982a1bad2ef45ad /include | |
| parent | 8e8b4ac5b0ab759fffcd4d802ab3e084e3609191 (diff) | |
| download | linux-bd3520a93a84cd8c3897283e5891a9106fcf5acc.tar.xz | |
iommu: observability of the IOMMU allocations
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@soleen.com>
Acked-by: David Rientjes <rientjes@google.com>
Tested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20240413002522.1101315-11-pasha.tatashin@soleen.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mmzone.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index c11b7cde81ef..be17195f6f86 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -206,6 +206,9 @@ enum node_stat_item { #endif NR_PAGETABLE, /* used for pagetables */ NR_SECONDARY_PAGETABLE, /* secondary pagetables, e.g. KVM pagetables */ +#ifdef CONFIG_IOMMU_SUPPORT + NR_IOMMU_PAGES, /* # of pages allocated by IOMMU */ +#endif #ifdef CONFIG_SWAP NR_SWAPCACHE, #endif |