On Tue, Dec 26, 2023 at 08:01:55PM +0000, Pasha Tatashin wrote: > ---------------------------------------------------------------------- > Changelog > ---------------------------------------------------------------------- > 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, 3b47bc037bd44f142ac09848e8d3ecccc726be99 > - Separated form the series patches: > vhost-vdpa: account iommu allocations > https://lore.kernel.org/all/20231130200447.2319543-1-pasha.tatashin@xxxxxxxxxx > vfio: account iommu allocations > https://lore.kernel.org/all/20231130200900.2320829-1-pasha.tatashin@xxxxxxxxxx > 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 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@xxxxxxxxxx > v2: https://lore.kernel.org/linux-mm/20231130201504.2322355-1-pasha.tatashin@xxxxxxxxxx > ---------------------------------------------------------------------- > First of all, Merry Christmas and Happy New Year for all! And for this series, no observable regressions when booting the kernel with the series applied. Tested-by: Bagas Sanjaya <bagasdotme@xxxxxxxxx> -- An old man doll... just what I always wanted! - Clara
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