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https://en.wikipedia.org/wiki/High_Precision_Event_Timer
The High Precision Event Timer (HPET) is a hardware timer used in personal computers.It was developed jointly by Intel and Microsoft and has been incorporated in PC chipsets since circa 2005. Formerly referred to by Intel as a Multimedia Timer, the term HPET was selected to avoid confusion with the software multimedia timers introduced in the MultiMedia Extensions to Windows 3.0.
https://stackoverflow.com/questions/8609142/high-resolution-timer-support-on-64-bit-linux
I'm trying to enable high resolution timer support on 2.6.39.1 64-bit Linux. To do this, I first set CONFIG_HIGH_RES_TIMERS=y in .config. Also, the output of grep HZ .config is: #
https://rt.wiki.kernel.org/index.php/High_resolution_timers
When the high resolution timers are enabled in the Linux kernel, then nanosleep, itimers and posix timers provide the high resolution mode without changes to the source code. Dynamic priority support for high resolution timers (extension available in the realtime preemption patch)
https://www.linuxquestions.org/questions/linux-kernel-70/high-resolution-timer-support-706471/
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http://www.tldp.org/HOWTO/IO-Port-Programming-4.html
4. High-resolution timing 4.1 Delays. First of all, I should say that you cannot guarantee user-mode processes to have exact control of timing because of the multi-tasking nature of Linux. Your process might be scheduled out at any time for anything from about 10 milliseconds to a few seconds (on a system with very high load).
https://www.kernel.org/doc/html/latest/timers/highres.html
This ensures also that a kernel which is configured for high resolution timers can run on a system which lacks the necessary hardware support. The high resolution timer code does not support SMP machines which have only global clock event devices. The support of such hardware would involve IPI calls when an interrupt happens.
https://stackoverflow.com/questions/7770353/high-resolution-timing-in-kernel
high resolution timing in kernel? Ask Question Asked 8 years, 2 months ago. ... Assuming the kernel you are running has the Hi-Res timer support turned on (it is a build time config option) and that you have a proper timer hardware which can provide the needed support to raise an interrupt in such granularity, you can use the in kernel hrtimer ...
https://www.kernel.org/doc/html/v5.4-rc8/timers/hrtimers.html
hrtimers - subsystem for high-resolution kernel timers¶. This patch introduces a new subsystem for high-resolution kernel timers. One might ask the question: we already have a timer subsystem (kernel/timers.c), why do we need two timer subsystems?
https://github.com/zephyrproject-rtos/zephyr/issues/6498
Mar 07, 2018 · In addition to a high-resolution timer API, I imagine users that have the high-frequency clock always-on anyway would like to be able to Kconfigure "_arch_k_cycle_get_32" to use the high-frequency clock instead of the low-frequency clock.
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