On Wed, Nov 28, 2012 at 5:19 AM, Rafael J. Wysocki <rjw@xxxxxxx> wrote: > > Please use counters instead of walking the whole path every time. Ie. in > addition to the flag add a counter to store the number of the device's > children having that flag set. Even though counter is added, walking the whole path can't be avoided too, and may be a explicit walking or recursion, because pm_runtime_set_memalloc_noio is required to set or clear the flag(or increase/decrease the counter) of devices in the whole path. Thanks, -- Ming Lei -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>