| Message ID | 20240222173942.1481394-1-pasha.tatashin@soleen.com |
|---|---|
| Headers | show |
| Series | IOMMU memory observability | expand |
On Thu, 22 Feb 2024, Pasha Tatashin wrote: > Pasha Tatashin (11): > iommu/vt-d: add wrapper functions for page allocations > iommu/dma: use iommu_put_pages_list() to releae freelist > 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/exynos: 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 > > 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 | 7 +- > drivers/iommu/exynos-iommu.c | 14 +- > drivers/iommu/intel/dmar.c | 16 +- > drivers/iommu/intel/iommu.c | 47 ++---- > drivers/iommu/intel/iommu.h | 2 - > drivers/iommu/intel/irq_remapping.c | 16 +- > drivers/iommu/intel/pasid.c | 18 +-- > drivers/iommu/intel/svm.c | 11 +- > drivers/iommu/io-pgtable-arm.c | 15 +- > drivers/iommu/io-pgtable-dart.c | 37 ++--- > drivers/iommu/iommu-pages.h | 186 ++++++++++++++++++++++++ > drivers/iommu/rockchip-iommu.c | 14 +- > drivers/iommu/sun50i-iommu.c | 7 +- > drivers/iommu/tegra-smmu.c | 18 ++- > include/linux/mmzone.h | 5 +- > mm/vmstat.c | 3 + > 23 files changed, 361 insertions(+), 206 deletions(-) > create mode 100644 drivers/iommu/iommu-pages.h > Joerg, is this series anticipated to be queued up in the core branch of git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git so it gets into linux-next? This observability seems particularly useful so that we can monitor and alert on any unexpected increases (unbounded memory growth from this subsystem has in the past caused us issues before the memory is otherwise not observable by host software). Or are we still waiting on code reviews from some folks that we should ping? Thanks!
Hi David, On Fri, Mar 15, 2024 at 02:33:53PM -0700, David Rientjes wrote: > Joerg, is this series anticipated to be queued up in the core branch of > git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git so it gets into > linux-next? > > This observability seems particularly useful so that we can monitor and > alert on any unexpected increases (unbounded memory growth from this > subsystem has in the past caused us issues before the memory is otherwise > not observable by host software). > > Or are we still waiting on code reviews from some folks that we should > ping? A few more reviews would certainly help, but I will also do a review on my own. If things are looking good I can merge it into the iommu tree when 6.9-rc3 is released (which is the usual time I start merging new stuff). Regards, Joerg
> > Description > > ---------------------------------------------------------------------- > > 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. > > Can you please clarify what does KVM memory refers to here ? > Does it mean the VFIO map / virtio-iommu invoked ones for a guest VM? This means that nested page tables that are managed by KVM, and device page tables that are managed by IOMMU are all accounted in SecPageTables (secondary page tables). The decision to account them both in one field of meminfo was made at LPC'23. Pasha
Pasha, On Thu, Feb 22, 2024 at 05:39:26PM +0000, Pasha Tatashin wrote: > Pasha Tatashin (11): > iommu/vt-d: add wrapper functions for page allocations > iommu/dma: use iommu_put_pages_list() to releae freelist > 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/exynos: 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 Some problems with this: 1. I get DKIM failures when downloading this patch-set with b4, can you please send them via a mailserver with working DKIM? 2. They don't apply to v6.9-rc3. Please rebase to that version and are-send. Thanks, Joerg
> Some problems with this: > > 1. I get DKIM failures when downloading this patch-set with b4, can > you please send them via a mailserver with working DKIM? I was in the process of migrating from google domains to a different registrar, but I think now the issue is resolved. I will verify it. > 2. They don't apply to v6.9-rc3. Please rebase to that version and > are-send. I will. Thanks, Pasha
---------------------------------------------------------------------- Changelog ---------------------------------------------------------------------- v5: - Synced with v6.8-rc5 - Added: Acked-by: Marek Szyprowski <m.szyprowski@samsung.com> - Added: Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com> - Addressed review comments from Robin Murphy: Updated the header comment in iommu-pages.h Removed __iommu_alloc_pages_node(), invoke iommu_alloc_pages_node directly. Removed unused: __iommu_alloc_page_node() Removed __iommu_free_page() Renamed: iommu_free_pages_list() -> iommu_put_pages_list() Added missing iommu_put_pages_list() to dma-iommu.c in iommu/dma: use iommu_put_pages_list() to releae freelist v4: - Synced with v6.8-rc3 - Updated commit log for "iommu: account IOMMU allocated memory" as suggested by Michal Koutný - Added more Acked-bys David Rientjes and Thierry Reding - Added Tested-by Bagas Sanjaya. v3: - Sync with v6.7-rc7 - Addressed comments from David Rientjes: s/pages/page/, added unlikely() into the branches, expanded comment for iommu_free_pages_list(). - Added Acked-bys: David Rientjes v2: - Added Reviewed-by Janne Grunau - Sync with 6.7.0-rc3 - Separated form the series patches: vhost-vdpa: account iommu allocations https://lore.kernel.org/all/20231130200447.2319543-1-pasha.tatashin@soleen.com vfio: account iommu allocations https://lore.kernel.org/all/20231130200900.2320829-1-pasha.tatashin@soleen.com as suggested by Jason Gunthorpe - Fixed SPARC build issue detected by kernel test robot - Drop the following patches as they do account iommu page tables: iommu/dma: 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 as suggested by Robin Murphy. These patches are not related to IOMMU page tables. We might need to do a separate work to support DMA observability. - Remove support iommu/io-pgtable-arm-v7s as the 2nd level pages are under a page size, thanks Robin Murphy for pointing this out. ---------------------------------------------------------------------- Description ---------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------- Previous versions v1: https://lore.kernel.org/all/20231128204938.1453583-1-pasha.tatashin@soleen.com v2: https://lore.kernel.org/linux-mm/20231130201504.2322355-1-pasha.tatashin@soleen.com v3: https://lore.kernel.org/all/20231226200205.562565-1-pasha.tatashin@soleen.com v4: https://lore.kernel.org/all/20240207174102.1486130-1-pasha.tatashin@soleen.com ---------------------------------------------------------------------- Pasha Tatashin (11): iommu/vt-d: add wrapper functions for page allocations iommu/dma: use iommu_put_pages_list() to releae freelist 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/exynos: 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 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 | 7 +- drivers/iommu/exynos-iommu.c | 14 +- drivers/iommu/intel/dmar.c | 16 +- drivers/iommu/intel/iommu.c | 47 ++---- drivers/iommu/intel/iommu.h | 2 - drivers/iommu/intel/irq_remapping.c | 16 +- drivers/iommu/intel/pasid.c | 18 +-- drivers/iommu/intel/svm.c | 11 +- drivers/iommu/io-pgtable-arm.c | 15 +- drivers/iommu/io-pgtable-dart.c | 37 ++--- drivers/iommu/iommu-pages.h | 186 ++++++++++++++++++++++++ drivers/iommu/rockchip-iommu.c | 14 +- drivers/iommu/sun50i-iommu.c | 7 +- drivers/iommu/tegra-smmu.c | 18 ++- include/linux/mmzone.h | 5 +- mm/vmstat.c | 3 + 23 files changed, 361 insertions(+), 206 deletions(-) create mode 100644 drivers/iommu/iommu-pages.h