On Sat, Jul 11, 2015 at 04:36:53PM -0400, Waiman Long wrote: > Frequent CPU halting (vmexit) and CPU kicking (vmenter) lengthens > critical section and block forward progress. This patch implements > a kick-ahead mechanism where the unlocker will kick the queue head > vCPUs as well as up to two additional vCPUs next to the queue head if > they were halted. The kickings are done after exiting the critical > section to improve parallelism. > > The amount of kick-ahead allowed depends on the number of vCPUs in > the VM guest. This change should improve overall system performance > in a busy overcommitted guest.
-ENONUMBERS... also highly workload sensitive, if the lock hold time is just above our spin time you're wasting gobs of runtime. -- 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/
