Linux mainline fork with MSM8998 patches | https://mainline.space | Currently supported devices:
OnePlus 5/5T, Xiaomi Mi 6, F(x)tec Pro¹ (2019 QX1000 model) & Sony Xperia XZ Premium (UNTESTED!)
5721d4e5a9
Using tasklets for disk verification can reduce IO latency. When there are accelerated hash instructions it is often better to compute the hash immediately using a tasklet rather than deferring verification to a work-queue. This reduces time spent waiting to schedule work-queue jobs, but requires spending slightly more time in interrupt context. If the dm-bufio cache does not have the required hashes we fallback to the work-queue implementation. FEC is only possible using work-queue because code to support the FEC feature may sleep. The following shows a speed comparison of random reads on a dm-verity device. The dm-verity device uses a 1G ramdisk for data and a 1G ramdisk for hashes. One test was run using tasklets and one test was run using the existing work-queue solution. Both tests were run when the dm-bufio cache was hot. The tasklet implementation performs significantly better since there is no time spent waiting for work-queue jobs to be scheduled. READ: bw=181MiB/s (190MB/s), 181MiB/s-181MiB/s (190MB/s-190MB/s), io=512MiB (537MB), run=2827-2827msec READ: bw=23.6MiB/s (24.8MB/s), 23.6MiB/s-23.6MiB/s (24.8MB/s-24.8MB/s), io=512MiB (537MB), run=21688-21688msec Signed-off-by: Nathan Huckleberry <nhuck@google.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.