* john stultz <[email protected]> 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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