On Tue, 17 Mar 2015 04:44:11 -0700 "Paul E. McKenney" <paul...@linux.vnet.ibm.com> wrote:
> On Tue, Mar 17, 2015 at 07:40:56AM +0100, Peter Zijlstra wrote: > > On Mon, Mar 16, 2015 at 10:26:11PM -0400, Steven Rostedt wrote: > > > As I recently found out that this_cpu_read/write() is not that nice on > > > all architectures, > > > > In fact, they only really work well on x86. Aargh64 seems to have a semi > > usable version, but mostly its quite horrible indeed. > > Yeah, if you are in a preempt-disabled region, __this_cpu_read() and > __this_cpu_write() generate much better code on most platforms. > I was just having this discussion with Christoph. I originally switched to using this_cpu_ptr(), but I'll try __this_cpu* instead. I think Christoph recommended that too. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
