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IA32_UMWAIT_CONTROL[31:2] determines the maximum time in TSC-quanta that processor can stay in C0.1 or C0.2. A zero value means no maximum time. Each instruction sets its own deadline in the instruction's implicit input EDX:EAX value. The instruction wakes up if the time-stamp counter reaches or exceeds the specified deadline, or the umwait maximum time expires, or a store happens in the monitored address range in umwait. The administrator can write an unsigned 32-bit number to /sys/devices/system/cpu/umwait_control/max_time to change the default value. Note that a value of zero means there is no limit. The lower two bits of the value must be zero. [ tglx: Simplify the write function. Massage changelog ] Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Ashok Raj <ashok.raj@intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: "Borislav Petkov" <bp@alien8.de> Cc: "H Peter Anvin" <hpa@zytor.com> Cc: "Andy Lutomirski" <luto@kernel.org> Cc: "Peter Zijlstra" <peterz@infradead.org> Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com> Link: https://lkml.kernel.org/r/1560994438-235698-5-git-send-email-fenghua.yu@intel.com |
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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.