On Fri, 2013-04-12 at 11:16 +0200, Peter Zijlstra wrote: > On Wed, 2013-04-10 at 11:48 -0400, Olivier Langlois wrote: > > Please explain how expensive it is. All I am seeing is a couple of > > additions. > > Let me start with this, since your earlier argument also refers to > this. > > So yes it does look simple and straight fwd, only one addition. However > its an atomic operation across all threads of the same process. Imagine > a single process with 512 threads, all running on a separate cpu. > Peter,
It now makes perfect sense. Thank you for your explanation. It is showing me an aspect that I did overlook. Greetings, -- 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/
