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Date: Tue, 28 Nov 2023 20:49:22 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: akpm@...ux-foundation.org,
alex.williamson@...hat.com,
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Subject: [PATCH 00/16] IOMMU memory observability
From: Pasha Tatashin <tatashin@...gle.com>
IOMMU subsystem may contain state that is in gigabytes. Majority of that
state is iommu page tables. Yet, there is currently, no way to observe
how much memory is actually used by the iommu subsystem.
This patch series solves this problem by adding both observability to
all pages that are allocated by IOMMU, and also accountability, so
admins can limit the amount if via cgroups.
The system-wide observability is using /proc/meminfo:
SecPageTables: 438176 kB
Contains IOMMU and KVM memory.
Per-node observability:
/sys/devices/system/node/nodeN/meminfo
Node N SecPageTables: 422204 kB
Contains IOMMU and KVM memory memory in the given NUMA node.
Per-node IOMMU only observability:
/sys/devices/system/node/nodeN/vmstat
nr_iommu_pages 105555
Contains number of pages IOMMU allocated in the given node.
Accountability: using sec_pagetables cgroup-v2 memory.stat entry.
With the change, iova_stress[1] stops as limit is reached:
# ./iova_stress
iova space: 0T free memory: 497G
iova space: 1T free memory: 495G
iova space: 2T free memory: 493G
iova space: 3T free memory: 491G
stops as limit is reached.
This series encorporates suggestions that came from the discussion
at LPC [2].
[1] https://github.com/soleen/iova_stress
[2] https://lpc.events/event/17/contributions/1466
Pasha Tatashin (16):
iommu/vt-d: add wrapper functions for page allocations
iommu/amd: use page allocation function provided by iommu-pages.h
iommu/io-pgtable-arm: use page allocation function provided by
iommu-pages.h
iommu/io-pgtable-dart: use page allocation function provided by
iommu-pages.h
iommu/io-pgtable-arm-v7s: use page allocation function provided by
iommu-pages.h
iommu/dma: use page allocation function provided by iommu-pages.h
iommu/exynos: use page allocation function provided by iommu-pages.h
iommu/fsl: use page allocation function provided by iommu-pages.h
iommu/iommufd: use page allocation function provided by iommu-pages.h
iommu/rockchip: use page allocation function provided by iommu-pages.h
iommu/sun50i: use page allocation function provided by iommu-pages.h
iommu/tegra-smmu: use page allocation function provided by
iommu-pages.h
iommu: observability of the IOMMU allocations
iommu: account IOMMU allocated memory
vhost-vdpa: account iommu allocations
vfio: account iommu allocations
Documentation/admin-guide/cgroup-v2.rst | 2 +-
Documentation/filesystems/proc.rst | 4 +-
drivers/iommu/amd/amd_iommu.h | 8 -
drivers/iommu/amd/init.c | 91 +++++-----
drivers/iommu/amd/io_pgtable.c | 13 +-
drivers/iommu/amd/io_pgtable_v2.c | 20 +-
drivers/iommu/amd/iommu.c | 13 +-
drivers/iommu/dma-iommu.c | 8 +-
drivers/iommu/exynos-iommu.c | 14 +-
drivers/iommu/fsl_pamu.c | 5 +-
drivers/iommu/intel/dmar.c | 10 +-
drivers/iommu/intel/iommu.c | 47 ++---
drivers/iommu/intel/iommu.h | 2 -
drivers/iommu/intel/irq_remapping.c | 10 +-
drivers/iommu/intel/pasid.c | 12 +-
drivers/iommu/intel/svm.c | 7 +-
drivers/iommu/io-pgtable-arm-v7s.c | 9 +-
drivers/iommu/io-pgtable-arm.c | 7 +-
drivers/iommu/io-pgtable-dart.c | 37 ++--
drivers/iommu/iommu-pages.h | 231 ++++++++++++++++++++++++
drivers/iommu/iommufd/iova_bitmap.c | 6 +-
drivers/iommu/rockchip-iommu.c | 14 +-
drivers/iommu/sun50i-iommu.c | 7 +-
drivers/iommu/tegra-smmu.c | 18 +-
drivers/vfio/vfio_iommu_type1.c | 8 +-
drivers/vhost/vdpa.c | 3 +-
include/linux/mmzone.h | 5 +-
mm/vmstat.c | 3 +
28 files changed, 415 insertions(+), 199 deletions(-)
create mode 100644 drivers/iommu/iommu-pages.h
--
2.43.0.rc2.451.g8631bc7472-goog
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