![]() | |||||||||||||
Messages in this thread |
* Balbir Singh <balbir@linux.vnet.ibm.com> wrote: > >> Am I missing something? > > > > delay accounting was causing context-switch slowdown because it > > called sched_clock() explicitly - but indeed my fix to that is wrong > > ... > > > > how about reverting the change but also using rq->clock instead of > > sched_clock()? > > Hmm... I think that might work, I find that schedule() calls > __update_rq_clock() which in turn calls sched_clock(), so it might be > a worthwhile optimization. yep, that's the idea - in general rq->clock is updated for almost every scheduling event so you can rely on it instead of calling sched_clock() directly. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
| Last update: 2007-11-03 09:33 [from the cache] ©2003-2008 | |||||||||||||