From patchwork Thu Nov 30 20:15:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pasha Tatashin X-Patchwork-Id: 749351 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=soleen.com header.i=@soleen.com header.b="bPnoAUi9" Received: from mail-ot1-x32f.google.com (mail-ot1-x32f.google.com [IPv6:2607:f8b0:4864:20::32f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F00E199E for ; Thu, 30 Nov 2023 12:15:17 -0800 (PST) Received: by mail-ot1-x32f.google.com with SMTP id 46e09a7af769-6d7f3a4bbc6so796537a34.2 for ; Thu, 30 Nov 2023 12:15:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; t=1701375316; x=1701980116; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=B42Ompk/0S+0FHWlF0c0WCUF97rKJOKtrfjrMLAbFqA=; b=bPnoAUi9Mqlaj2MW8DUbnk1HFhAILmRap6jsO2xBXzj5XkFCTRTucPKv31jqdjl+Ua 3glj8AvwbiQ/xKX/TEpyhnxr+bOVUXGZaauETAuPQgN/25elsNdQjPvs3VBCY0Rjq1Jl 15XMHYmZ9WMqF4gXdVM1jJ3S6y85kkD7MqhrjpZtaUStpLKdH2JHnmWjw4almXjf3r1R 9JXkZn9Qk3PUHdlQj+40L2M/t2r4BWVq7xEZSBfxf8m0s0KSH3btJi5SlHr2Nzt9++KR 3EV16pTiJ/CPh3YbYixmvFqt6DLb6LuhhsfFz6JSXN8fcmg/kVGXmOlm+/m5YPQezPID gTtQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1701375316; x=1701980116; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=B42Ompk/0S+0FHWlF0c0WCUF97rKJOKtrfjrMLAbFqA=; b=q7kHfXvLB2zfL2Qw6gNadtTrJzll7IR1hhPfAVkTzyd/FXRkyk/A9XCLMVpQzRsXHf fkfQ2Qsj8XMA8I3tbbihHf8C6TYVwfyBmt6cjoMcUIYyAMSexE7XmJ7dEjEj6O+fdTPb IYUiH9qbRA5jUvQef5iYjsXaRP5/wPQq/5eNHhYIM0IgrkkaVgT0K+YfVbvaIEIboLEA hL9NNepN18S4dcI49+pmV3LuyMUmVCAeEayyIk5ZVZFBT7Q/xEviMmywFtSC8eer+/V0 uMSUDxQfB8W0L9teG/T2xAKO71BvVxccGfT2/E6Cc5vx3n60iQRQbvg9YnMh3tRS0aRF Iqkw== X-Gm-Message-State: AOJu0YwW7xg35EVYcv+n2SEJ4o/9xjrOL8x2yo/J+SXdkqk/3MjC1D/r 1FJiNEZzZLGm3JTCcELI93RuXA== X-Google-Smtp-Source: AGHT+IFm2VZamMYGPMsf9vCHQb4stofA9P0lnINgFWclhv2SjMIVDU5Q4H8UbP8D1DLG6NZm/4QG2w== X-Received: by 2002:a9d:7dd2:0:b0:6d7:f02f:dcc3 with SMTP id k18-20020a9d7dd2000000b006d7f02fdcc3mr809535otn.28.1701375316245; Thu, 30 Nov 2023 12:15:16 -0800 (PST) Received: from soleen.c.googlers.com.com (55.87.194.35.bc.googleusercontent.com. [35.194.87.55]) by smtp.gmail.com with ESMTPSA id e1-20020a0cb441000000b0067a35608186sm795252qvf.28.2023.11.30.12.15.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Nov 2023 12:15:15 -0800 (PST) From: Pasha Tatashin To: akpm@linux-foundation.org, 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, jernej.skrabec@gmail.com, jonathanh@nvidia.com, joro@8bytes.org, krzysztof.kozlowski@linaro.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, m.szyprowski@samsung.com, 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, wens@csie.org, will@kernel.org, yu-cheng.yu@intel.com Subject: [PATCH v2 09/10] iommu: observability of the IOMMU allocations Date: Thu, 30 Nov 2023 20:15:03 +0000 Message-ID: <20231130201504.2322355-10-pasha.tatashin@soleen.com> X-Mailer: git-send-email 2.43.0.rc2.451.g8631bc7472-goog In-Reply-To: <20231130201504.2322355-1-pasha.tatashin@soleen.com> References: <20231130201504.2322355-1-pasha.tatashin@soleen.com> Precedence: bulk X-Mailing-List: linux-samsung-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 Acked-by: David Rientjes --- 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. */ +/** + * __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