mirror of
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
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Main-line Linux kernel tree
http://www.kernel.org
4c2fdf7393
pcc_cpufreq_target(): cpufreq_freq_transition_begin(); spin_lock(&pcc_lock); [critical section] cpufreq_freq_transition_end(); spin_unlock(&pcc_lock); Above code has a performance issue, consider that Task0 executes 'cpufreq_freq_transition_end()' to wake Task1 and preempted imediatedly without releasing 'pcc_lock', then Task1 needs to wait for Task0 to release 'pcc_lock'. In the worst case, this locking order can result in Task1 wasting two scheduling rounds before it can enter the critical section. Signed-off-by: Liao Chang <liaochang1@huawei.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| block | ||
| 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.