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...o push expensive non-cacheable predicates inside the action so the cacheable ones can still do their job efficiently (see http://docs.sun.com/app/docs/doc/817-6223/chp-perf-3?a=view) For example, I have a dtrace script that prints out a message whenever a thread gets preempted during certain (< 1usec long) critical sections. To avoid the overhead of invoking dtrace every time they enter/exit (~6usec), at thread startup they pass dtrace a pointer to a variable which they can then update directly; dtrace checks it during context switches: sched:::off-cpu / pid == $1 && self->user_ptr...

1: x86/mwait_idle: remove assumption of one C-state per MWAIT flag 2: x86/mwait_idle: export both C1 and C1E 3: x86/mwait_idle: initial C8, C9, C10 support Signed-off-by: Len Brown <len.brown@intel.com> Signed-off-by: Jan Beulich <jbeulich@suse.com>