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authorShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>2015-06-18 14:23:11 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-06-22 16:15:15 +0300
commit78eaa10f027cf69f9bd409e64eaff902172b2327 (patch)
treecf3a819d4726147b8214eb4a6337b2423c1d245f /drivers/cpuidle
parent7d51d97925e6cbfa2f7f14e3e3aa363b35ee5c24 (diff)
downloadlinux-78eaa10f027cf69f9bd409e64eaff902172b2327.tar.xz
cpuidle: powernv/pseries: Auto-promotion of snooze to deeper idle state
The idle cpus which stay in snooze for a long period can degrade the perfomance of the sibling cpus. If the cpu stays in snooze for more than target residency of the next available idle state, then exit from snooze. This gives a chance to the cpuidle governor to re-evaluate the last idle state of the cpu to promote it to deeper idle states. Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle-powernv.c12
-rw-r--r--drivers/cpuidle/cpuidle-pseries.c11
2 files changed, 23 insertions, 0 deletions
diff --git a/drivers/cpuidle/cpuidle-powernv.c b/drivers/cpuidle/cpuidle-powernv.c
index 59372077ec7c..1e3ef5ec4784 100644
--- a/drivers/cpuidle/cpuidle-powernv.c
+++ b/drivers/cpuidle/cpuidle-powernv.c
@@ -29,18 +29,25 @@ struct cpuidle_driver powernv_idle_driver = {
static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;
+static u64 snooze_timeout;
+static bool snooze_timeout_en;
static int snooze_loop(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
+ u64 snooze_exit_time;
+
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ snooze_exit_time = get_tb() + snooze_timeout;
ppc64_runlatch_off();
while (!need_resched()) {
HMT_low();
HMT_very_low();
+ if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ break;
}
HMT_medium();
@@ -252,6 +259,11 @@ static int powernv_idle_probe(void)
cpuidle_state_table = powernv_states;
/* Device tree can indicate more idle states */
max_idle_state = powernv_add_idle_states();
+ if (max_idle_state > 1) {
+ snooze_timeout_en = true;
+ snooze_timeout = powernv_states[1].target_residency *
+ tb_ticks_per_usec;
+ }
} else
return -ENODEV;
diff --git a/drivers/cpuidle/cpuidle-pseries.c b/drivers/cpuidle/cpuidle-pseries.c
index bb9e2b6f3ecc..07135e009d8b 100644
--- a/drivers/cpuidle/cpuidle-pseries.c
+++ b/drivers/cpuidle/cpuidle-pseries.c
@@ -27,6 +27,8 @@ struct cpuidle_driver pseries_idle_driver = {
static int max_idle_state;
static struct cpuidle_state *cpuidle_state_table;
+static u64 snooze_timeout;
+static bool snooze_timeout_en;
static inline void idle_loop_prolog(unsigned long *in_purr)
{
@@ -58,14 +60,18 @@ static int snooze_loop(struct cpuidle_device *dev,
int index)
{
unsigned long in_purr;
+ u64 snooze_exit_time;
idle_loop_prolog(&in_purr);
local_irq_enable();
set_thread_flag(TIF_POLLING_NRFLAG);
+ snooze_exit_time = get_tb() + snooze_timeout;
while (!need_resched()) {
HMT_low();
HMT_very_low();
+ if (snooze_timeout_en && get_tb() > snooze_exit_time)
+ break;
}
HMT_medium();
@@ -244,6 +250,11 @@ static int pseries_idle_probe(void)
} else
return -ENODEV;
+ if (max_idle_state > 1) {
+ snooze_timeout_en = true;
+ snooze_timeout = cpuidle_state_table[1].target_residency *
+ tb_ticks_per_usec;
+ }
return 0;
}