| Message ID | 20231128204938.1453583-14-pasha.tatashin@soleen.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | IOMMU memory observability | expand |
Hi Pasha, kernel test robot noticed the following build errors: [auto build test ERROR on akpm-mm/mm-everything] [also build test ERROR on awilliam-vfio/for-linus linus/master v6.7-rc3] [cannot apply to joro-iommu/next awilliam-vfio/next next-20231130] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information] url: https://github.com/intel-lab-lkp/linux/commits/Pasha-Tatashin/iommu-vt-d-add-wrapper-functions-for-page-allocations/20231129-054908 base: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything patch link: https://lore.kernel.org/r/20231128204938.1453583-14-pasha.tatashin%40soleen.com patch subject: [PATCH 13/16] iommu: observability of the IOMMU allocations config: sparc64-randconfig-r054-20231130 (https://download.01.org/0day-ci/archive/20231130/202311302108.WERv9oSO-lkp@intel.com/config) compiler: sparc64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231130/202311302108.WERv9oSO-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202311302108.WERv9oSO-lkp@intel.com/ All errors (new ones prefixed by >>): In file included from drivers/iommu/iommufd/iova_bitmap.c:11: drivers/iommu/iommufd/../iommu-pages.h: In function '__iommu_alloc_account': >> drivers/iommu/iommufd/../iommu-pages.h:29:48: error: 'NR_IOMMU_PAGES' undeclared (first use in this function) 29 | mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, pgcnt); | ^~~~~~~~~~~~~~ drivers/iommu/iommufd/../iommu-pages.h:29:48: note: each undeclared identifier is reported only once for each function it appears in drivers/iommu/iommufd/../iommu-pages.h: In function '__iommu_free_account': drivers/iommu/iommufd/../iommu-pages.h:41:48: error: 'NR_IOMMU_PAGES' undeclared (first use in this function) 41 | mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, -pgcnt); | ^~~~~~~~~~~~~~ vim +/NR_IOMMU_PAGES +29 drivers/iommu/iommufd/../iommu-pages.h 13 14 /* 15 * All page allocation that are performed in the IOMMU subsystem must use one of 16 * the functions below. This is necessary for the proper accounting as IOMMU 17 * state can be rather large, i.e. multiple gigabytes in size. 18 */ 19 20 /** 21 * __iommu_alloc_account - account for newly allocated page. 22 * @pages: head struct page of the page. 23 * @order: order of the page 24 */ 25 static inline void __iommu_alloc_account(struct page *pages, int order) 26 { 27 const long pgcnt = 1l << order; 28 > 29 mod_node_page_state(page_pgdat(pages), NR_IOMMU_PAGES, pgcnt); 30 } 31
diff --git a/drivers/iommu/iommu-pages.h b/drivers/iommu/iommu-pages.h index 2332f807d514..69895a355c0c 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. + * @pages: head struct page of the page. + * @order: order of the page + */ +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); +} + +/** + * __iommu_free_account - account a page that is about to be freed. + * @pages: head struct page of the page. + * @order: order of the page + */ +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); +} + /** * __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 (!pages) return NULL; + __iommu_alloc_account(pages, order); + return pages; } @@ -53,6 +79,8 @@ static inline struct page *__iommu_alloc_pages(gfp_t gfp, int order) if (!pages) return NULL; + __iommu_alloc_account(pages, order); + return pages; } @@ -89,6 +117,7 @@ static inline void __iommu_free_pages(struct page *pages, int order) if (!pages) return; + __iommu_free_account(pages, order); __free_pages(pages, order); } @@ -192,6 +221,7 @@ static inline void iommu_free_pages_list(struct list_head *pages) struct page *p = list_entry(pages->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 3c25226beeed..1a4d0bba3e8b 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
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@soleen.com> --- drivers/iommu/iommu-pages.h | 30 ++++++++++++++++++++++++++++++ include/linux/mmzone.h | 3 +++ mm/vmstat.c | 3 +++ 3 files changed, 36 insertions(+)