Anton Blanchard <an...@ozlabs.org> writes: > From: Anton Blanchard <an...@samba.org> > > ppc64 is the only architecture that turns on VIRT_CPU_ACCOUNTING_NATIVE > by default. The overhead of this option is extremely high - a context > switch microbenchmark using sched_yield() is almost 20% slower.
Running on what? It should all be nop'ed out unless you're on a platform that needs it (SPLPAR). > To get finer grained user/hardirq/softirq statitics, the > IRQ_TIME_ACCOUNTING option can be used instead, which has much lower > overhead. Can it? We don't select HAVE_IRQ_TIME_ACCOUNTING, so AFAICS it can't be enabled. Doesn't dropping this mean we never count stolen time? cheers
