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[35.194.87.55]) by smtp.gmail.com with ESMTPSA id d11-20020a0cfe8b000000b0067a56b6adfesm1056863qvs.71.2023.11.28.12.49.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 28 Nov 2023 12:49:53 -0800 (PST) From: Pasha Tatashin To: akpm@linux-foundation.org, alex.williamson@redhat.com, alim.akhtar@samsung.com, alyssa@rosenzweig.io, asahi@lists.linux.dev, baolu.lu@linux.intel.com, bhelgaas@google.com, cgroups@vger.kernel.org, corbet@lwn.net, david@redhat.com, dwmw2@infradead.org, hannes@cmpxchg.org, heiko@sntech.de, iommu@lists.linux.dev, jasowang@redhat.com, jernej.skrabec@gmail.com, jgg@ziepe.ca, jonathanh@nvidia.com, joro@8bytes.org, kevin.tian@intel.com, krzysztof.kozlowski@linaro.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rockchip@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-sunxi@lists.linux.dev, linux-tegra@vger.kernel.org, lizefan.x@bytedance.com, marcan@marcan.st, mhiramat@kernel.org, mst@redhat.com, m.szyprowski@samsung.com, netdev@vger.kernel.org, pasha.tatashin@soleen.com, paulmck@kernel.org, rdunlap@infradead.org, robin.murphy@arm.com, samuel@sholland.org, suravee.suthikulpanit@amd.com, sven@svenpeter.dev, thierry.reding@gmail.com, tj@kernel.org, tomas.mudrunka@gmail.com, vdumpa@nvidia.com, virtualization@lists.linux.dev, wens@csie.org, will@kernel.org, yu-cheng.yu@intel.com Subject: [PATCH 13/16] iommu: observability of the IOMMU allocations Date: Tue, 28 Nov 2023 20:49:35 +0000 Message-ID: <20231128204938.1453583-14-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.43.0.rc2.451.g8631bc7472-goog In-Reply-To: <20231128204938.1453583-1-pasha.tatashin@soleen.com> References: <20231128204938.1453583-1-pasha.tatashin@soleen.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 --- 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 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. */ =20 +/** + * __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 =3D 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 =3D 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 n= id, gfp_t gfp, if (!pages) return NULL; =20 + __iommu_alloc_account(pages, order); + return pages; } =20 @@ -53,6 +79,8 @@ static inline struct page *__iommu_alloc_pages(gfp_t gfp,= int order) if (!pages) return NULL; =20 + __iommu_alloc_account(pages, order); + return pages; } =20 @@ -89,6 +117,7 @@ static inline void __iommu_free_pages(struct page *pages= , int order) if (!pages) return; =20 + __iommu_free_account(pages, order); __free_pages(pages, order); } =20 @@ -192,6 +221,7 @@ static inline void iommu_free_pages_list(struct list_he= ad *pages) struct page *p =3D list_entry(pages->prev, struct page, lru); =20 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[] =3D { #endif "nr_page_table_pages", "nr_sec_page_table_pages", +#ifdef CONFIG_IOMMU_SUPPORT + "nr_iommu_pages", +#endif #ifdef CONFIG_SWAP "nr_swapcached", #endif --=20 2.43.0.rc2.451.g8631bc7472-goog