On Wed, Apr 12, 2017 at 04:57:58PM +0200, Thomas Gleixner wrote: > 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.
Sounds nice, and accumulation shouldn't introduce too much overhead. Let's try that. Thanks. > > Thanks, > > tglx >
