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08ae95f4fd
Allow the boot CPU/CPU0 to be nohz_full. Have the boot CPU take the do_timer duty during boot until a housekeeping CPU can take over. This is supported when CONFIG_PM_SLEEP_SMP is not configured, or when it is configured and the arch allows suspend on non-zero CPUs. nohz_full has been trialed at a large supercomputer site and found to significantly reduce jitter. In order to deploy it in production, they need CPU0 to be nohz_full because their job control system requires the application CPUs to start from 0, and the housekeeping CPUs are placed higher. An equivalent job scheduling that uses CPU0 for housekeeping could be achieved by modifying their system, but it is preferable if nohz_full can support their environment without modification. Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linuxppc-dev@lists.ozlabs.org Link: https://lkml.kernel.org/r/20190411033448.20842-6-npiggin@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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| 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.