[PATCH 14/16] iommu: account IOMMU allocated memory
From: Pasha Tatashin <pasha.tatashin@soleen.com>
Date: 2023-11-28 20:49:55
Also in:
asahi, cgroups, kvm, linux-doc, linux-fsdevel, linux-iommu, linux-mm, linux-rockchip, linux-samsung-soc, linux-sunxi, linux-tegra, lkml, virtualization
Subsystem:
control group (cgroup), documentation, iommu subsystem, memory management - core, memory management - mglru (multi-gen lru), proc filesystem, the rest · Maintainers:
Tejun Heo, Johannes Weiner, Michal Koutný, Jonathan Corbet, Joerg Roedel, Will Deacon, Andrew Morton, David Hildenbrand, Linus Torvalds
In order to be able to limit the amount of memory that is allocated by IOMMU subsystem, the memory must be accounted. Account IOMMU as part of the secondary pagetables as it was discussed at LPC. The value of SecPageTables now contains mmeory allocation by IOMMU and KVM. Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com> --- Documentation/admin-guide/cgroup-v2.rst | 2 +- Documentation/filesystems/proc.rst | 4 ++-- drivers/iommu/iommu-pages.h | 2 ++ include/linux/mmzone.h | 2 +- 4 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 3f85254f3cef..e004e05a7cde 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst@@ -1418,7 +1418,7 @@ PAGE_SIZE multiple when read back. sec_pagetables Amount of memory allocated for secondary page tables, this currently includes KVM mmu allocations on x86 - and arm64. + and arm64 and IOMMU page tables. percpu (npn) Amount of memory used for storing per-cpu kernel
diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 49ef12df631b..86f137a9b66b 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst@@ -1110,8 +1110,8 @@ KernelStack PageTables Memory consumed by userspace page tables SecPageTables - Memory consumed by secondary page tables, this currently - currently includes KVM mmu allocations on x86 and arm64. + Memory consumed by secondary page tables, this currently includes + KVM mmu and IOMMU allocations on x86 and arm64. NFS_Unstable Always zero. Previous counted pages which had been written to the server, but has not been committed to stable storage.
diff --git a/drivers/iommu/iommu-pages.h b/drivers/iommu/iommu-pages.h
index 69895a355c0c..cdd257585284 100644
--- a/drivers/iommu/iommu-pages.h
+++ b/drivers/iommu/iommu-pages.h@@ -27,6 +27,7 @@ static inline void __iommu_alloc_account(struct page *pages, int order) const long pgcnt = 1l << order; mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, pgcnt); + mod_lruvec_page_state(pages, NR_SECONDARY_PAGETABLE, pgcnt); } /**
@@ -39,6 +40,7 @@ static inline void __iommu_free_account(struct page *pages, int order) const long pgcnt = 1l << order; mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, -pgcnt); + mod_lruvec_page_state(pages, NR_SECONDARY_PAGETABLE, -pgcnt); } /**
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 1a4d0bba3e8b..aaabb385663c 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h@@ -199,7 +199,7 @@ enum node_stat_item { NR_KERNEL_SCS_KB, /* measured in KiB */ #endif NR_PAGETABLE, /* used for pagetables */ - NR_SECONDARY_PAGETABLE, /* secondary pagetables, e.g. KVM pagetables */ + NR_SECONDARY_PAGETABLE, /* secondary pagetables, KVM & IOMMU */ #ifdef CONFIG_IOMMU_SUPPORT NR_IOMMU_PAGES, /* # of pages allocated by IOMMU */ #endif
--
2.43.0.rc2.451.g8631bc7472-goog