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Linux kernel source tree
1e2c449927
Currently the the config fragment for cpufreq enables a lot of generic lock debugging. While these options are useful when testing cpufreq they aren't actually required to run the tests and are therefore out of scope for the cpufreq fragement, they are more of a thing that it's good to enable while doing testing than an actual requirement for cpufreq testing specifically. Having these debugging options enabled, especially the mutex and spinlock instrumentation, mean that any build that includes the cpufreq fragment is both very much larger than a standard defconfig (eg, I'm seeing 35% on x86_64) and also slower at runtime. This is causing real problems for CI systems. In order to avoid building large numbers of kernels they try to group kselftest fragments together, frequently just grouping all the kselftest fragments into a single block. The increased size is an issue for memory constrained systems and is also problematic for systems with fixed storage allocations for kernel images (eg, typical u-boot systems) where it frequently causes the kernel to overflow the storage space allocated for kernels. The reduced performance isn't too bad with real hardware but can be disruptive on emulated platforms. In order to avoid these issues remove these generic instrumentation options from the cpufreq fragment, bringing the cpufreq fragment into line with other fragments which generally set requirements for testing rather than nice to haves. Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org> |
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| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| 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.