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| author |  Pasha Tatashin <pasha.tatashin@soleen.com>
| 2024-04-13 00:25:21 +0000 |
|---|---|---|
| committer |  Joerg Roedel <jroedel@suse.de>
| 2024-04-15 14:31:47 +0200 |
| commit | bd3520a93a84cd8c3897283e5891a9106fcf5acc (patch) | |
| tree | 664e71aad879fc1e588f25f29982a1bad2ef45ad /mm/vmstat.c | |
| parent | iommu/tegra-smmu: use page allocation function provided by iommu-pages.h (diff) | |
| download | linux-bd3520a93a84cd8c3897283e5891a9106fcf5acc.tar.gz linux-bd3520a93a84cd8c3897283e5891a9106fcf5acc.tar.bz2 linux-bd3520a93a84cd8c3897283e5891a9106fcf5acc.zip | |
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 'mm/vmstat.c')
| -rw-r--r-- | mm/vmstat.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/vmstat.c b/mm/vmstat.c index db79935e4a54..8507c497218b 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1242,6 +1242,9 @@ const char * const vmstat_text[] = { #endif "nr_page_table_pages", "nr_sec_page_table_pages", +#ifdef CONFIG_IOMMU_SUPPORT + "nr_iommu_pages", +#endif #ifdef CONFIG_SWAP "nr_swapcached", #endif |