Oh, Thanks. I find the fllowing code: with the predicted c state index, use "enter" handler to set CPU to into C state.
next_state = cpuidle_curr_governor->select(dev); .... dev->last_residency = target_state->enter(dev, target_state); Suppose it enter C1, but maybe C2 is better. The cpuidle wiil wait until next interrupt(timer or others) by keeping C1 state ? or some time later make CPU enter into C2 state? At 2010-12-30 00:42:29，"Arjan van de Ven" <ar...@linux.intel.com> wrote: >On 12/29/2010 6:36 AM, wkq5325 wrote: >> Hi, >> I find the function "tick_nohz_get_sleep_length()" in menu.c >> The source code says that it returns the length of the current sleep. >> Is it predicted sleep time length or current sleep time length? I am >> confused a lot. >> But Venkatesh's paper says that it is a predicted time. > >it's the time of the next timer. >the actual prediction is a correction on top of that. > >> >> Thanks. >> >> >> wkq >> >> >> >> _______________________________________________ >> Discuss mailing list >> Discuss@lesswatts.org >> http://lists.lesswatts.org/listinfo/discuss >
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