On Wed, 12 Apr 2017, Frederic Weisbecker wrote: > On Tue, Apr 11, 2017 at 04:22:48PM +0200, Thomas Gleixner wrote: > > It's not different from the current jiffies based stuff at all. Same > > failure mode. > > Yes you're right, I got confused again. So to fix this we could do our > snapshots > at a frequency lower than HZ but still high enough to avoid overhead. > > Something like TICK_NSEC / 2 ?
If you are using TSC anyway then you can do proper accumulation for both system and user and only account the data when the accumulation is more than a jiffie. Thanks, tglx