Messages in this thread | | | Date | Thu, 14 Aug 2008 23:20:36 +0200 | From | Andi Kleen <> | Subject | Re: [PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptible kernel and CPU hotplug |
| |
> So, unless these calculus are completely bogus, the difference between the nop > and the DS case seems not to be statistically significant.
My understanding was that the nops only make a measurable difference in the -pg/mcount/ftrace patched out case where every function call starts with a 5 byte nop.
Presumably function calls are much more common than lock prefix operations.
-Andi
| |