forked from Minki/linux
mainlining shenanigans
c6e7bd7afa
Both Rik and Mel reported seeing ttwu() spend significant time on: smp_cond_load_acquire(&p->on_cpu, !VAL); Attempt to avoid this by queueing the wakeup on the CPU that owns the p->on_cpu value. This will then allow the ttwu() to complete without further waiting. Since we run schedule() with interrupts disabled, the IPI is guaranteed to happen after p->on_cpu is cleared, this is what makes it safe to queue early. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Jirka Hladky <jhladky@redhat.com> Cc: Vincent Guittot <vincent.guittot@linaro.org> Cc: valentin.schneider@arm.com Cc: Hillf Danton <hdanton@sina.com> Cc: Rik van Riel <riel@surriel.com> Link: https://lore.kernel.org/r/20200524202956.27665-2-mgorman@techsingularity.net |
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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.