On Fri, Jul 05, 2013 at 11:19:31AM +0800, Yan, Zheng wrote: > On 07/04/2013 08:41 PM, Peter Zijlstra wrote: > > It should be *optional*, also wtf is that parent_ctx thing for? > > parent_ctx is for the fork() case, used for checking if the callstack feature > is enabled for the parent task. If yes, clone parent task's LBR stack. > For the simple program below:
So there's a problem with all this; contexts aren't strict per task, we play games with them in perf_event_context_sched_out(). We'd have to disable that context switch optimization for LBR stack to work and that's massively expensive. If you actually did that, you again fail for not having mentioned this in your changelog. I'm starting to not want to read patches from you; going through them is just too much effort, I might as well write the stuff myself :/ -- 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/
