From: Venkatesh Pallipadi <venki@google.com>
To: Len Brown <lenb@kernel.org>
Cc: ACPI list <linux-acpi@vger.kernel.org>,
Venkatesh Pallipadi <venki@google.com>
Subject: [PATCH] acpi: Eliminate us to pm ticks conversion in common path
Date: Wed, 2 Jun 2010 10:01:09 -0700 [thread overview]
Message-ID: <1275498069-30614-1-git-send-email-venki@google.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1005281509430.4045@localhost.localdomain>
Is this one better?
Thanks,
Venki
acpi_enter_[simple|bm] routines does us to pm tick conversion on every
idle wakeup and the value is only used in /proc/acpi display. We can
store the time in us and convert it into pm ticks before printing instead and
avoid the conversion in the common path.
Signed-off-by: Venkatesh Pallipadi <venki@google.com>
---
drivers/acpi/processor_idle.c | 15 +++++----------
1 files changed, 5 insertions(+), 10 deletions(-)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 2e8c27d..71c9608 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -80,7 +80,7 @@ module_param(nocst, uint, 0000);
static unsigned int latency_factor __read_mostly = 2;
module_param(latency_factor, uint, 0644);
-static s64 us_to_pm_timer_ticks(s64 t)
+static u64 us_to_pm_timer_ticks(s64 t)
{
return div64_u64(t * PM_TIMER_FREQUENCY, 1000000);
}
@@ -731,10 +731,10 @@ static int acpi_processor_power_seq_show(struct seq_file *seq, void *offset)
seq_puts(seq, "demotion[--] ");
- seq_printf(seq, "latency[%03d] usage[%08d] duration[%020llu]\n",
+ seq_printf(seq, "latency[%03d] usage[%08d] duration[%020Lu]\n",
pr->power.states[i].latency,
pr->power.states[i].usage,
- (unsigned long long)pr->power.states[i].time);
+ us_to_pm_timer_ticks(pr->power.states[i].time));
}
end:
@@ -861,7 +861,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
ktime_t kt1, kt2;
s64 idle_time_ns;
s64 idle_time;
- s64 sleep_ticks = 0;
pr = __get_cpu_var(processors);
@@ -906,8 +905,6 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
idle_time = idle_time_ns;
do_div(idle_time, NSEC_PER_USEC);
- sleep_ticks = us_to_pm_timer_ticks(idle_time);
-
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(idle_time_ns);
@@ -918,7 +915,7 @@ static int acpi_idle_enter_simple(struct cpuidle_device *dev,
cx->usage++;
lapic_timer_state_broadcast(pr, cx, 0);
- cx->time += sleep_ticks;
+ cx->time += idle_time;
return idle_time;
}
@@ -940,7 +937,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
ktime_t kt1, kt2;
s64 idle_time_ns;
s64 idle_time;
- s64 sleep_ticks = 0;
pr = __get_cpu_var(processors);
@@ -1026,7 +1022,6 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
idle_time = idle_time_ns;
do_div(idle_time, NSEC_PER_USEC);
- sleep_ticks = us_to_pm_timer_ticks(idle_time);
/* Tell the scheduler how much we idled: */
sched_clock_idle_wakeup_event(idle_time_ns);
@@ -1037,7 +1032,7 @@ static int acpi_idle_enter_bm(struct cpuidle_device *dev,
cx->usage++;
lapic_timer_state_broadcast(pr, cx, 0);
- cx->time += sleep_ticks;
+ cx->time += idle_time;
return idle_time;
}
--
1.7.0.1
next prev parent reply other threads:[~2010-06-02 17:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-22 23:48 [PATCH] acpi: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion Venkatesh Pallipadi
2010-05-18 1:47 ` Venkatesh Pallipadi
2010-05-28 19:09 ` Len Brown
2010-06-02 17:01 ` Venkatesh Pallipadi [this message]
2010-06-04 7:44 ` [PATCH] acpi: Eliminate us to pm ticks conversion in common path Len Brown
2010-05-28 19:10 ` [PATCH] acpi: Minor cleanup eliminating redundant PMTIMER_TICKS to NS conversion Len Brown
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