On Mon, May 22, 2017 at 02:03:21PM +0200, Peter Zijlstra wrote: > On Fri, May 19, 2017 at 10:06:22AM -0700, kan.li...@intel.com wrote: > > This patch was once merged, but reverted later. > > Because ref-cycles can not be used anymore when watchdog is enabled. > > The commit is 44530d588e142a96cf0cd345a7cb8911c4f88720 > > > > The patch 1/2 has extended the ref-cycles to GP counter. The concern > > should be gone. > > So its not a problem if every Atom prior to Goldmont, and all Core/Core2 > products regress? > > P6 and P4 you've entirely broken, as they don't have REF_CPU_CYCLES at all.
+ KNC > > So no, I don't think this is right even now. > >
