| Message ID | 1393223377-5744-2-git-send-email-tuukka.tikkanen@linaro.org (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Headers | show |
On Mon, 24 Feb 2014, Tuukka Tikkanen wrote: > The field expected_us is used to store the time remaining until next > timer expiry. The name is inaccurate, as we really do not expect all > wakeups to be caused by timers. In addition, another field with a very > similar name (predicted_us) is used to store the predicted time > remaining until any wakeup source being active. > > This patch renames expected_us to next_timer_us in order to better > reflect the contained information. > > Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org> Acked-by: Nicolas Pitre <nico@linaro.org> > --- > drivers/cpuidle/governors/menu.c | 18 +++++++++--------- > 1 file changed, 9 insertions(+), 9 deletions(-) > > diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c > index cf7f2f0..e9a2a27 100644 > --- a/drivers/cpuidle/governors/menu.c > +++ b/drivers/cpuidle/governors/menu.c > @@ -122,7 +122,7 @@ struct menu_device { > int last_state_idx; > int needs_update; > > - unsigned int expected_us; > + unsigned int next_timer_us; > unsigned int predicted_us; > unsigned int exit_us; > unsigned int bucket; > @@ -257,7 +257,7 @@ again: > stddev = int_sqrt(stddev); > if (((avg > stddev * 6) && (divisor * 4 >= INTERVALS * 3)) > || stddev <= 20) { > - if (data->expected_us > avg) > + if (data->next_timer_us > avg) > data->predicted_us = avg; > return; > } > @@ -306,11 +306,11 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) > > /* determine the expected residency time, round up */ > t = ktime_to_timespec(tick_nohz_get_sleep_length()); > - data->expected_us = > + data->next_timer_us = > t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC; > > > - data->bucket = which_bucket(data->expected_us); > + data->bucket = which_bucket(data->next_timer_us); > > multiplier = performance_multiplier(); > > @@ -326,7 +326,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) > * operands are 32 bits. > * Make sure to round up for half microseconds. > */ > - data->predicted_us = div_round64((uint64_t)data->expected_us * > + data->predicted_us = div_round64((uint64_t)data->next_timer_us * > data->correction_factor[data->bucket], > RESOLUTION * DECAY); > > @@ -336,7 +336,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) > * We want to default to C1 (hlt), not to busy polling > * unless the timer is happening really really soon. > */ > - if (data->expected_us > 5 && > + if (data->next_timer_us > 5 && > !drv->states[CPUIDLE_DRIVER_STATE_START].disabled && > dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0) > data->last_state_idx = CPUIDLE_DRIVER_STATE_START; > @@ -401,7 +401,7 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev) > * for the whole expected time. > */ > if (unlikely(!(target->flags & CPUIDLE_FLAG_TIME_VALID))) > - last_idle_us = data->expected_us; > + last_idle_us = data->next_timer_us; > > > measured_us = last_idle_us; > @@ -418,8 +418,8 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev) > new_factor = data->correction_factor[data->bucket]; > new_factor -= new_factor / DECAY; > > - if (data->expected_us > 0 && measured_us < MAX_INTERESTING) > - new_factor += RESOLUTION * measured_us / data->expected_us; > + if (data->next_timer_us > 0 && measured_us < MAX_INTERESTING) > + new_factor += RESOLUTION * measured_us / data->next_timer_us; > else > /* > * we were idle so long that we count it as a perfect > -- > 1.7.9.5 > > -- > 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/ > -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
> This patch renames expected_us to next_timer_us in order to better > reflect the contained information. > > Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org> Acked-by: Len Brown <len.brown@intel.com> -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/cpuidle/governors/menu.c b/drivers/cpuidle/governors/menu.c index cf7f2f0..e9a2a27 100644 --- a/drivers/cpuidle/governors/menu.c +++ b/drivers/cpuidle/governors/menu.c @@ -122,7 +122,7 @@ struct menu_device { int last_state_idx; int needs_update; - unsigned int expected_us; + unsigned int next_timer_us; unsigned int predicted_us; unsigned int exit_us; unsigned int bucket; @@ -257,7 +257,7 @@ again: stddev = int_sqrt(stddev); if (((avg > stddev * 6) && (divisor * 4 >= INTERVALS * 3)) || stddev <= 20) { - if (data->expected_us > avg) + if (data->next_timer_us > avg) data->predicted_us = avg; return; } @@ -306,11 +306,11 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) /* determine the expected residency time, round up */ t = ktime_to_timespec(tick_nohz_get_sleep_length()); - data->expected_us = + data->next_timer_us = t.tv_sec * USEC_PER_SEC + t.tv_nsec / NSEC_PER_USEC; - data->bucket = which_bucket(data->expected_us); + data->bucket = which_bucket(data->next_timer_us); multiplier = performance_multiplier(); @@ -326,7 +326,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) * operands are 32 bits. * Make sure to round up for half microseconds. */ - data->predicted_us = div_round64((uint64_t)data->expected_us * + data->predicted_us = div_round64((uint64_t)data->next_timer_us * data->correction_factor[data->bucket], RESOLUTION * DECAY); @@ -336,7 +336,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev) * We want to default to C1 (hlt), not to busy polling * unless the timer is happening really really soon. */ - if (data->expected_us > 5 && + if (data->next_timer_us > 5 && !drv->states[CPUIDLE_DRIVER_STATE_START].disabled && dev->states_usage[CPUIDLE_DRIVER_STATE_START].disable == 0) data->last_state_idx = CPUIDLE_DRIVER_STATE_START; @@ -401,7 +401,7 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev) * for the whole expected time. */ if (unlikely(!(target->flags & CPUIDLE_FLAG_TIME_VALID))) - last_idle_us = data->expected_us; + last_idle_us = data->next_timer_us; measured_us = last_idle_us; @@ -418,8 +418,8 @@ static void menu_update(struct cpuidle_driver *drv, struct cpuidle_device *dev) new_factor = data->correction_factor[data->bucket]; new_factor -= new_factor / DECAY; - if (data->expected_us > 0 && measured_us < MAX_INTERESTING) - new_factor += RESOLUTION * measured_us / data->expected_us; + if (data->next_timer_us > 0 && measured_us < MAX_INTERESTING) + new_factor += RESOLUTION * measured_us / data->next_timer_us; else /* * we were idle so long that we count it as a perfect
The field expected_us is used to store the time remaining until next timer expiry. The name is inaccurate, as we really do not expect all wakeups to be caused by timers. In addition, another field with a very similar name (predicted_us) is used to store the predicted time remaining until any wakeup source being active. This patch renames expected_us to next_timer_us in order to better reflect the contained information. Signed-off-by: Tuukka Tikkanen <tuukka.tikkanen@linaro.org> --- drivers/cpuidle/governors/menu.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-)