From mboxrd@z Thu Jan 1 00:00:00 1970 From: "T.J. Mercier" Subject: [PATCH 0/4] Track exported dma-buffers with memcg Date: Mon, 9 Jan 2023 21:38:03 +0000 Message-ID: <20230109213809.418135-1-tjmercier@google.com> Mime-Version: 1.0 Return-path: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=g7XZ6zbY4DVhx/1OXdLF/gOX5xZT7N2TM5K+hmXQB+Q=; b=lp6mFgIFtl15wfLpEIICylaN7ba0rLKWyBcSmwWXHBIHGw2PfI8uc5JoYpz78iGrzt q7BwcvepUR121HS9evBvJZvukxIVfLEQnv4pKm0uyiAQHZ2lPiVMGwyZcSxUFbhaL90/ ucKWwiEICRsvndQmUOtOCqlM9msyGSEUsXD5lwlIQfLeTtimxNUVh0grkxXS2J8ZCHmG Om+IZIdCATJX9OXIuWLzOFPLT1CV83yldN+eGwxCxvUZBerXOoxKxtFA5g5ttfCJSVS7 8JY1ciKixBdA0fOe8xhy0huWzEPzI2dQz1uyE93OBKFPfOC0Iwt7BiU0pYO43R8uQXJv jjig== List-ID: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: tjmercier@google.com, Tejun Heo , Zefan Li , Johannes Weiner , Jonathan Corbet , Greg Kroah-Hartman , =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , Todd Kjos , Martijn Coenen , Joel Fernandes , Christian Brauner , Carlos Llamas , Suren Baghdasaryan , Sumit Semwal , =?UTF-8?q?Christian=20K=C3=B6nig?= , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Cc: daniel.vetter@ffwll.ch, android-mm@google.com, jstultz@google.com, cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Based on discussions at LPC, this series adds a memory.stat counter for exported dmabufs. This counter allows us to continue tracking system-wide total exported buffer sizes which there is no longer any way to get without DMABUF_SYSFS_STATS, and adds a new capability to track per-cgroup exported buffer sizes. The total (root counter) is helpful for accounting in-kernel dmabuf use (by comparing with the sum of child nodes or with the sum of sizes of mapped buffers or FD references in procfs) in addition to helping identify driver memory leaks when in-kernel use continually increases over time. With per-application cgroups, the per-cgroup counter allows us to quickly see how much dma-buf memory an application has caused to be allocated. This avoids the need to read through all of procfs which can be a lengthy process, and causes the charge to "stick" to the allocating process/cgroup as long as the buffer is alive, regardless of how the buffer is shared (unless the charge is transferred). The first patch adds the counter to memcg. The next two patches allow the charge for a buffer to be transferred across cgroups which is necessary because of the way most dmabufs are allocated from a central process on Android. The fourth patch adds a SELinux hook to binder in order to control who is allowed to transfer buffer charges. [1] https://lore.kernel.org/all/20220617085702.4298-1-christian.koenig@amd.com/ Hridya Valsaraju (1): binder: Add flags to relinquish ownership of fds T.J. Mercier (3): memcg: Track exported dma-buffers dmabuf: Add cgroup charge transfer function security: binder: Add transfer_charge SElinux hook Documentation/admin-guide/cgroup-v2.rst | 5 +++ drivers/android/binder.c | 36 +++++++++++++++-- drivers/dma-buf/dma-buf.c | 54 +++++++++++++++++++++++-- include/linux/dma-buf.h | 5 +++ include/linux/lsm_hook_defs.h | 2 + include/linux/lsm_hooks.h | 6 +++ include/linux/memcontrol.h | 7 ++++ include/linux/security.h | 2 + include/uapi/linux/android/binder.h | 23 +++++++++-- mm/memcontrol.c | 4 ++ security/security.c | 6 +++ security/selinux/hooks.c | 9 +++++ security/selinux/include/classmap.h | 2 +- 13 files changed, 149 insertions(+), 12 deletions(-) base-commit: b7bfaa761d760e72a969d116517eaa12e404c262 -- 2.39.0.314.g84b9a713c41-goog