Re: [RFC PATCH 1/3] sched/core: add API for exporting runqueue clock

[Ming Lei]

On Wed, Dec 18, 2019 at 10:51:01AM +0100, Peter Zijlstra wrote:
> On Wed, Dec 18, 2019 at 03:19:40PM +0800, Ming Lei wrote:
> > Scheduler runqueue maintains its own software clock that is periodically
> > synchronised with hardware. Export this clock so that it can be used
> > by interrupt flood detection for saving the cost of reading from hardware.
> 
> But you don't have much, if any, guarantees the thing gets updated.

Any software clock won't be guaranteed to be updated in time, however,
they are still useful.

Thanks,
Ming