Android ion memory Feb 8, 2012 · The Android ION memory allocator February 8, 2012 This article was contributed by Thomas M. Ion introduction ION is the universal memory manager introduced in Android 4. This interface is primarily intended to be used with Ubuntu Core. 0 in order to resolve internal blocking management, used to support different memory allocation mechanisms, such as Carvout - qcom,memory-reservation-size: size of reserved memory for the ION heap. When a buffer is shared by two components, the memory copies are eliminated, thus achieving zero-memory-copy. Since time will be limited, I wanted to create some background documentation to try to provide context to the issues we will discuss and try to resolve at the micro-conference. h Oct 24, 2016 · ION is a unified memory management interface for Android that is widely used on virtually all ARM based Android devices. To sat-isfy such requirements, on a given Android phone, ION is customized with a set of pre-configured memory heaps for the underlying hardware devices. Dec 13, 2013 · create mode 100644 drivers/staging/android/ion/ion_system_heap. This wasn't possible with ION because allocation from any heap only required access to the /dev/ion device. The new allocator allows us to allocate memory from different heaps and devices, virtual and physical The ion-memory-control interface allows access to the Android ION memory allocator, a Linux kernel feature for managing one or more memory pools. 0 (aka Ice Cream Sandwich), Google was finally fed up with the private memory manager structure and decreed that all newer devices with Android 4. c create mode 100644 drivers/staging/android/uapi/ion. The work to add ION to the mainline started in 2013; at that time, the allocator had multiple issues that made inclusion impossible. For instance, some devices require physically con-tiguous memory to operate and some require certain cache coherency protocol for DMA to function correctly. c create mode 100644 drivers/staging/android/ion/ion_test. g. Introduction——What is ION? A generalized memory pool manager It’s used to address the issue of fragmented memory management interfaces across different Android devices. , physically contiguous Dec 21, 2014 · Each type of Android device can be provisioned with a different set of ION heaps according to the memory requirements of the device. Mar 27, 2025 · There is no interface available to expose per-ION heap statistics in Android 11. Recently, John Stultz posted a Jul 5, 2016 · The Android ION memory allocator Posted Jul 5, 2016 0:37 UTC (Tue) by simonwan (guest, #109625) Parent article: The Android ION memory allocator Dec 26, 2013 · For Android 4. Jul 6, 2016 · The Android ION memory allocator Posted Jul 6, 2016 0:59 UTC (Wed) by simonwan (guest, #109625) [Link] (1 responses) Hi excors, Thank you for the reply. - qcom,memory-reservation-type: type of memory to be reserved (see memory-reserve. Ignored if the heap does not support prefetching. 0 で ION アロケータが DMA-BUF ヒープに置き換えられています。 セキュリティ: 各 DMA-BUF ヒープは個別のキャラクター デバイスであるため、各ヒープへのアクセスは sepolicy で個別に制御できます。 Nov 23, 2017 · One of the features google added to linux kernel is a general purpose allocator /dev/ion. c create mode 100644 drivers/staging/android/ion/tegra/Makefile create mode 100644 drivers/staging/android/ion/tegra/tegra_ion. 0 native should use the new, so called "ION" memory manager. txt for information about memory reservations) - qcom,default-prefetch-size: Base value to be used for prefetching optimizations. The provider of an ION heap must implement the following set of callbacks: include/linux/ion. Through this framework, one can allocate, free, share or import a memory buffer; the latter can either live in main memory (CPU addressable Sep 4, 2013 · As part of the Android + Graphics micro-conference at the 2013 Linux Plumbers Conference, we'll be discussing the ION memory allocator and how its functionality might be upstreamed to the mainline kernel. 0 replaces the ION allocator with DMA-BUF heaps for the following reasons: Security: Because each DMA-BUF heap is a separate character device, access to each heap can be controlled separately with sepolicy. h - kernel/common - Git at Googleblob: 40ea332ebfa22ce131ae3ef7f3e8d7c7d20771b7 [file] [log] [blame] Nov 18, 2017 · ION 是当前 Android 流行的内存分配管理机制，在多媒体部分中使用的最多，例如从 Camera 到 Display，从 Mediaserver 到 Surfaceflinger，都会利用 ION 进行内存分配管理。 ION 的前任是 PMEM，关于 PMEM 我在 M030/M04X 项目中有接触过，后来由于 PMEM 的一些局限性，Google 推出了 ION 来取代 PMEM，当前 ION 已经融合到 Linux Android 12 では、次の理由により、GKI 2. Jul 24, 2012 · ION is a memory manager introduced by Google in Android ICS v4. Different from managing regular memory in the system, ION is designed to share and manage memory with special constraints, e. Zeng Back in December 2011, LWN reviewed the list of Android kernel patches in the linux-next staging directory. Mar 27, 2025 · In Android 12, GKI 2. . ION attempts to achieve several ambitious goals that have not been simultaneously achieved before (not even on Linux). The ION allocator has been in use since around 2012, but it remains stuck in the kernel's staging tree. 0 to facilitate buffer-sharing. So what is exactly the Android ION? In a simple words, Android ION removes ARM specific dependencies. ION overview Jul 9, 2019 · The Android system has shipped a couple of allocators for DMA buffers over the years; first came PMEM, then its replacement ION. The following table compares the ION statistics interfaces with their counterparts for devices that use the DMA-BUF heap framework in Android 12. fpvy dgwrw qxibh urm nfpju zijsy gdgr uibi pnkzwju vesz mcobwi mpqsv tuhu vrl ejpd