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Fri, 05 Jan 2024 07:34:14 -0800 (PST) MIME-Version: 1.0 References: <20231226200205.562565-1-pasha.tatashin@soleen.com> In-Reply-To: From: Pasha Tatashin Date: Fri, 5 Jan 2024 10:33:38 -0500 Message-ID: Subject: Re: [PATCH v3 00/10] IOMMU memory observability To: =?UTF-8?Q?Michal_Koutn=C3=BD?= Cc: 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, 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, rientjes@google.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: 4mbenxeragn74j7phqmq8sarfb866hnx X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: B641F18000D X-Rspam-User: X-HE-Tag: 1704468855-322538 X-HE-Meta: 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 /b0nctez gO0U0reCmpduP/exn5APtcUNqqx5GdQk3pXGOcxCargxy4VLxj2rxYz7zZbdfni5UsuKx5Ktm7uJyvuFlv4jMU05Gp+skDDTDk2kwRAxqeD65pGPfUiEa9Momk3aINIxvLEcj0Nrtgebtt3QrVD3BVv9J7ow2kH7TKR7EBRBGXDSGMcN1Owbn1JwG9RLWpMbMaHgk+WWrK9qSAlL5udnAxDYjfqbG+tKqrJkxpCIzHyvIrP0uJ+7MP5eKd8PQPem5Gxag0CvbZYAun9G2YGqtQuAUWh+6SPiB3DD78VjvmOyQ5rfxTxLtrIDheunREYqimkhw/vzaMS8nWExbNOtpWjnYAF+zJ3kvvAeW7kOoxtII+lWjuf3Sdj/MN4db6Lhe4cmXBXjdRFu4h61CXQxG7YdjfMW4IoK8v9tQ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jan 5, 2024 at 4:02=E2=80=AFAM Michal Koutn=C3=BD wrote: > > On Thu, Jan 04, 2024 at 02:12:26PM -0500, Pasha Tatashin wrote: > > Yes, we will have a difference between GFP_ACCOUNT and what > > NR_IOMMU_PAGES shows. GFP_ACCOUNT is set only where it makes sense to > > charge to user processes, i.e. IOMMU Page Tables, but there more IOMMU > > shared data that should not really be charged to a specific process. > > I see. I'd suggest adding this explanation to commit 10/10 message > (perhaps with some ballpark numbers of pages). In order to have a > reference and understadning if someone decided to charge (and limit) all > in the future. Sure, I will update the commit log in 10/10 with this info if we will have = v4. Pasha > > Thanks, > Michal