Re: [RFC][PATCHSET] Time: Generic Timeofday Subsystem (v B20)

[Ingo Molnar]

* john stultz <johnstul@xxxxxxxxxx> wrote:

> Summary:
> 	This patchset provides a generic timekeeping subsystem that is 
> independent of the timer interrupt. This allows for robust and correct 
> behavior in cases of late or lost ticks, avoids interpolation errors, 
> reduces duplication in arch specific code, and allows or assists 
> future changes such as high-res timers, dynamic ticks, or realtime 
> preemption.  Additionally, it provides finer nanosecond resolution 
> values to the clock_gettime functions.
> 
> Why do we need this?

i'd like to add the following to the list of reasons as well: the 
current -hrt patch-queue (high resolution timers, which enables true 
microsecond-level resolution for POSIX timers and nanosleep()), which is 
working pretty well in the -rt tree and implements an important feature 
for Linux, is based on the generic timekeeping subsystem as well.

	Ingo
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