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@xxxxxxxxxx> Acked-by: David Rientjes <rientjes@xxxxxxxxxx> --- drivers/iommu/iommu-pages.h | 30 ++++++++++++++++++++++++++++++ include/linux/mmzone.h | 3 +++ mm/vmstat.c | 3 +++ 3 files changed, 36 insertions(+) diff --git a/drivers/iommu/iommu-pages.h b/drivers/iommu/iommu-pages.h index 99105503b771..4e70cdf7acac 100644 --- a/drivers/iommu/iommu-pages.h +++ b/drivers/iommu/iommu-pages.h @@ -17,6 +17,30 @@ * state can be rather large, i.e. multiple gigabytes in size. */ +/** + * __iommu_alloc_account - account for newly allocated page. + * @page: head struct page of the page. + * @order: order of the page + */ +static inline void __iommu_alloc_account(struct page *page, int order) +{ + const long pgcnt = 1l << order; + + mod_node_page_state(page_pgdat(page), NR_IOMMU_PAGES, pgcnt); +} + +/** + * __iommu_free_account - account a page that is about to be freed. + * @page: head struct page of the page. + * @order: order of the page + */ +static inline void __iommu_free_account(struct page *page, int order) +{ + const long pgcnt = 1l << order; + + mod_node_page_state(page_pgdat(page), NR_IOMMU_PAGES, -pgcnt); +} + /** * __iommu_alloc_pages_node - allocate a zeroed page of a given order from * specific NUMA node. @@ -35,6 +59,8 @@ static inline struct page *__iommu_alloc_pages_node(int nid, gfp_t gfp, if (unlikely(!page)) return NULL; + __iommu_alloc_account(page, order); + return page; } @@ -53,6 +79,8 @@ static inline struct page *__iommu_alloc_pages(gfp_t gfp, int order) if (unlikely(!page)) return NULL; + __iommu_alloc_account(page, order); + return page; } @@ -89,6 +117,7 @@ static inline void __iommu_free_pages(struct page *page, int order) if (!page) return; + __iommu_free_account(page, order); __free_pages(page, order); } @@ -197,6 +226,7 @@ static inline void iommu_free_pages_list(struct list_head *page) struct page *p = list_entry(page->prev, struct page, lru); list_del(&p->lru); + __iommu_free_account(p, 0); put_page(p); } } diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 9db36e197712..f0b54c752e22 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -200,6 +200,9 @@ enum node_stat_item { #endif NR_PAGETABLE, /* used for pagetables */ NR_SECONDARY_PAGETABLE, /* secondary pagetables, e.g. KVM pagetables */ +#ifdef CONFIG_IOMMU_SUPPORT + NR_IOMMU_PAGES, /* # of pages allocated by IOMMU */ +#endif #ifdef CONFIG_SWAP NR_SWAPCACHE, #endif diff --git a/mm/vmstat.c b/mm/vmstat.c index 359460deb377..801b58890b6c 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 -- 2.43.0.472.g3155946c3a-goog