[PATCH 0/5] Enabling the asynchronous threads for other phases

[PATCH 0/5] Enabling the asynchronous threads for other phases

[Liu, Chuansheng]

Hello,

This patch series are for enabling the asynchronous threads for the phases
resume_noirq, resume_early, suspend_noirq and suspend_late.

Just like commit 5af84b82701a and 97df8c12995, with async threads it will
reduce the system suspending and resuming time significantly.

With these patches, in my test platform, it saved 80% time in resume_noirq
phase.

Has done the suspend-resume stress test for a long time, please help to
review.

Best Regards,

[PATCH 1/5] PM: Adding two flags for async suspend_noirq and
[PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
[PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
[PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
[PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late

 drivers/base/power/main.c |  240 ++++++++++++++++++++++++++++++++++++---------
 include/linux/pm.h        |    2 +
 2 files changed, 197 insertions(+), 45 deletions(-)

[PATCH 1/5] PM: Adding two flags for async suspend_noirq and suspend_late

[Liu, Chuansheng]

From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

The patch is one helper that adding two new flags for implementing
async threads for suspend_noirq and suspend_late.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
 drivers/base/power/main.c |   22 ++++++++++++++++++++--
 include/linux/pm.h        |    2 ++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 6a33dd8..bf71ddb 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -72,6 +72,8 @@ void device_pm_sleep_init(struct device *dev)
 {
 	dev->power.is_prepared = false;
 	dev->power.is_suspended = false;
+	dev->power.is_noirq_suspended = false;
+	dev->power.is_late_suspended = false;
 	init_completion(&dev->power.completion);
 	complete_all(&dev->power.completion);
 	dev->power.wakeup = NULL;
@@ -464,6 +466,9 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
 	if (dev->power.syscore)
 		goto Out;
 
+	if (!dev->power.is_noirq_suspended)
+		goto Out;
+
 	if (dev->pm_domain) {
 		info = "noirq power domain ";
 		callback = pm_noirq_op(&dev->pm_domain->ops, state);
@@ -484,6 +489,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
 	}
 
 	error = dpm_run_callback(callback, dev, state, info);
+	dev->power.is_noirq_suspended = false;
 
  Out:
 	TRACE_RESUME(error);
@@ -546,6 +552,9 @@ static int device_resume_early(struct device *dev, pm_message_t state)
 	if (dev->power.syscore)
 		goto Out;
 
+	if (!dev->power.is_late_suspended)
+		goto Out;
+
 	if (dev->pm_domain) {
 		info = "early power domain ";
 		callback = pm_late_early_op(&dev->pm_domain->ops, state);
@@ -566,6 +575,7 @@ static int device_resume_early(struct device *dev, pm_message_t state)
 	}
 
 	error = dpm_run_callback(callback, dev, state, info);
+	dev->power.is_late_suspended = false;
 
  Out:
 	TRACE_RESUME(error);
@@ -902,6 +912,7 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
 {
 	pm_callback_t callback = NULL;
 	char *info = NULL;
+	int error;
 
 	if (dev->power.syscore)
 		return 0;
@@ -925,7 +936,10 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
 		callback = pm_noirq_op(dev->driver->pm, state);
 	}
 
-	return dpm_run_callback(callback, dev, state, info);
+	error = dpm_run_callback(callback, dev, state, info);
+	if (!error)
+		dev->power.is_noirq_suspended = true;
+	return error;
 }
 
 /**
@@ -988,6 +1002,7 @@ static int device_suspend_late(struct device *dev, pm_message_t state)
 {
 	pm_callback_t callback = NULL;
 	char *info = NULL;
+	int error;
 
 	__pm_runtime_disable(dev, false);
 
@@ -1013,7 +1028,10 @@ static int device_suspend_late(struct device *dev, pm_message_t state)
 		callback = pm_late_early_op(dev->driver->pm, state);
 	}
 
-	return dpm_run_callback(callback, dev, state, info);
+	error = dpm_run_callback(callback, dev, state, info);
+	if (!error)
+		dev->power.is_late_suspended = true;
+	return error;
 }
 
 /**
diff --git a/include/linux/pm.h b/include/linux/pm.h
index a224c7f..fe90a8b 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -521,6 +521,8 @@ struct dev_pm_info {
 	unsigned int		async_suspend:1;
 	bool			is_prepared:1;	/* Owned by the PM core */
 	bool			is_suspended:1;	/* Ditto */
+	bool			is_noirq_suspended:1;
+	bool			is_late_suspended:1;
 	bool			ignore_children:1;
 	bool			early_init:1;	/* Owned by the PM core */
 	spinlock_t		lock;
-- 
1.7.9.5

[PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq

[Liu, Chuansheng]

From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

Just like commit 5af84b82701a and 97df8c12995, using the
asynchronous threads can improve the overall resume_noirq
time significantly.

One typical case is:
In resume_noirq phase and for the PCI devices, the function
pci_pm_resume_noirq() will be called, and there is one d3_delay
(10ms) at least.

With the way of asynchronous threads, we just need wait d3_delay
time once in parallel for each calling, which save much time to
resume quickly.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
 drivers/base/power/main.c |   59 +++++++++++++++++++++++++++++++++------------
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index bf71ddb..c8a00fc 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -496,6 +496,23 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
 	return error;
 }
 
+static bool is_async(struct device *dev)
+{
+	return dev->power.async_suspend && pm_async_enabled
+		&& !pm_trace_is_enabled();
+}
+
+static void async_resume_noirq(void *data, async_cookie_t cookie)
+{
+	struct device *dev = (struct device *)data;
+	int error;
+
+	error = device_resume_noirq(dev, pm_transition);
+	if (error)
+		pm_dev_err(dev, pm_transition, " async", error);
+	put_device(dev);
+}
+
 /**
  * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
  * @state: PM transition of the system being carried out.
@@ -505,29 +522,47 @@ static int device_resume_noirq(struct device *dev, pm_message_t state)
  */
 static void dpm_resume_noirq(pm_message_t state)
 {
+	struct device *dev;
 	ktime_t starttime = ktime_get();
 
 	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_noirq_list)) {
-		struct device *dev = to_device(dpm_noirq_list.next);
-		int error;
+	pm_transition = state;
 
+	/*
+	 * Advanced the async threads upfront,
+	 * in case the starting of async threads is
+	 * delayed by non-async resuming devices.
+	 */
+	list_for_each_entry(dev, &dpm_noirq_list, power.entry) {
+		if (is_async(dev)) {
+			get_device(dev);
+			async_schedule(async_resume_noirq, dev);
+		}
+	}
+
+	while (!list_empty(&dpm_noirq_list)) {
+		dev = to_device(dpm_noirq_list.next);
 		get_device(dev);
 		list_move_tail(&dev->power.entry, &dpm_late_early_list);
 		mutex_unlock(&dpm_list_mtx);
 
-		error = device_resume_noirq(dev, state);
-		if (error) {
-			suspend_stats.failed_resume_noirq++;
-			dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
-			dpm_save_failed_dev(dev_name(dev));
-			pm_dev_err(dev, state, " noirq", error);
+		if (!is_async(dev)) {
+			int error;
+
+			error = device_resume_noirq(dev, state);
+			if (error) {
+				suspend_stats.failed_resume_noirq++;
+				dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
+				dpm_save_failed_dev(dev_name(dev));
+				pm_dev_err(dev, state, " noirq", error);
+			}
 		}
 
 		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}
 	mutex_unlock(&dpm_list_mtx);
+	async_synchronize_full();
 	dpm_show_time(starttime, state, "noirq");
 	resume_device_irqs();
 	cpuidle_resume();
@@ -727,12 +762,6 @@ static void async_resume(void *data, async_cookie_t cookie)
 	put_device(dev);
 }
 
-static bool is_async(struct device *dev)
-{
-	return dev->power.async_suspend && pm_async_enabled
-		&& !pm_trace_is_enabled();
-}
-
 /**
  * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
  * @state: PM transition of the system being carried out.
-- 
1.7.9.5

[PATCH 3/5] PM: Enabling the asyncronous threads for resume_early

[Liu, Chuansheng]

From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

Just like commit 5af84b82701a and 97df8c12995, using the
asynchronous threads can improve the overall resume_early
time significantly.

This patch is for resume_early phase.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
 drivers/base/power/main.c |   48 +++++++++++++++++++++++++++++++++++----------
 1 file changed, 38 insertions(+), 10 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index c8a00fc..1bad6bd 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -619,35 +619,63 @@ static int device_resume_early(struct device *dev, pm_message_t state)
 	return error;
 }
 
+static void async_resume_early(void *data, async_cookie_t cookie)
+{
+	struct device *dev = (struct device *)data;
+	int error;
+
+	error = device_resume_early(dev, pm_transition);
+	if (error)
+		pm_dev_err(dev, pm_transition, " async", error);
+	put_device(dev);
+}
+
 /**
  * dpm_resume_early - Execute "early resume" callbacks for all devices.
  * @state: PM transition of the system being carried out.
  */
 static void dpm_resume_early(pm_message_t state)
 {
+	struct device *dev;
 	ktime_t starttime = ktime_get();
 
 	mutex_lock(&dpm_list_mtx);
-	while (!list_empty(&dpm_late_early_list)) {
-		struct device *dev = to_device(dpm_late_early_list.next);
-		int error;
+	pm_transition = state;
 
+	/*
+	 * Advanced the async threads upfront,
+	 * in case the starting of async threads is
+	 * delayed by non-async resuming devices.
+	 */
+	list_for_each_entry(dev, &dpm_late_early_list, power.entry) {
+		if (is_async(dev)) {
+			get_device(dev);
+			async_schedule(async_resume_early, dev);
+		}
+	}
+
+	while (!list_empty(&dpm_late_early_list)) {
+		dev = to_device(dpm_late_early_list.next);
 		get_device(dev);
 		list_move_tail(&dev->power.entry, &dpm_suspended_list);
 		mutex_unlock(&dpm_list_mtx);
 
-		error = device_resume_early(dev, state);
-		if (error) {
-			suspend_stats.failed_resume_early++;
-			dpm_save_failed_step(SUSPEND_RESUME_EARLY);
-			dpm_save_failed_dev(dev_name(dev));
-			pm_dev_err(dev, state, " early", error);
-		}
+		if (!is_async(dev)) {
+			int error;
 
+			error = device_resume_early(dev, state);
+			if (error) {
+				suspend_stats.failed_resume_early++;
+				dpm_save_failed_step(SUSPEND_RESUME_EARLY);
+				dpm_save_failed_dev(dev_name(dev));
+				pm_dev_err(dev, state, " early", error);
+			}
+		}
 		mutex_lock(&dpm_list_mtx);
 		put_device(dev);
 	}
 	mutex_unlock(&dpm_list_mtx);
+	async_synchronize_full();
 	dpm_show_time(starttime, state, "early");
 }
 
-- 
1.7.9.5

[PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq

[Liu, Chuansheng]

From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

Just like commit 5af84b82701a and 97df8c12995, using the
asynchronous threads can improve the overall suspend_noirq
time significantly.

This patch is for suspend_noirq phase.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
 drivers/base/power/main.c |   57 ++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 48 insertions(+), 9 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index 1bad6bd..ec946aa 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -965,12 +965,20 @@ static pm_message_t resume_event(pm_message_t sleep_state)
  * The driver of @dev will not receive interrupts while this function is being
  * executed.
  */
-static int device_suspend_noirq(struct device *dev, pm_message_t state)
+static int __device_suspend_noirq(struct device *dev, pm_message_t state)
 {
 	pm_callback_t callback = NULL;
 	char *info = NULL;
 	int error;
 
+	if (async_error)
+		return 0;
+
+	if (pm_wakeup_pending()) {
+		async_error = -EBUSY;
+		return async_error;
+	}
+
 	if (dev->power.syscore)
 		return 0;
 
@@ -996,9 +1004,36 @@ static int device_suspend_noirq(struct device *dev, pm_message_t state)
 	error = dpm_run_callback(callback, dev, state, info);
 	if (!error)
 		dev->power.is_noirq_suspended = true;
+	else
+		async_error = error;
+
 	return error;
 }
 
+static void async_suspend_noirq(void *data, async_cookie_t cookie)
+{
+	struct device *dev = (struct device *)data;
+	int error;
+
+	error = __device_suspend_noirq(dev, pm_transition);
+	if (error) {
+		dpm_save_failed_dev(dev_name(dev));
+		pm_dev_err(dev, pm_transition, " async", error);
+	}
+
+	put_device(dev);
+}
+
+static int device_suspend_noirq(struct device *dev)
+{
+	if (pm_async_enabled && dev->power.async_suspend) {
+		get_device(dev);
+		async_schedule(async_suspend_noirq, dev);
+		return 0;
+	}
+	return __device_suspend_noirq(dev, pm_transition);
+}
+
 /**
  * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
  * @state: PM transition of the system being carried out.
@@ -1014,19 +1049,20 @@ static int dpm_suspend_noirq(pm_message_t state)
 	cpuidle_pause();
 	suspend_device_irqs();
 	mutex_lock(&dpm_list_mtx);
+	pm_transition = state;
+	async_error = 0;
+
 	while (!list_empty(&dpm_late_early_list)) {
 		struct device *dev = to_device(dpm_late_early_list.prev);
 
 		get_device(dev);
 		mutex_unlock(&dpm_list_mtx);
 
-		error = device_suspend_noirq(dev, state);
+		error = device_suspend_noirq(dev);
 
 		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			pm_dev_err(dev, state, " noirq", error);
-			suspend_stats.failed_suspend_noirq++;
-			dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
 			dpm_save_failed_dev(dev_name(dev));
 			put_device(dev);
 			break;
@@ -1035,15 +1071,18 @@ static int dpm_suspend_noirq(pm_message_t state)
 			list_move(&dev->power.entry, &dpm_noirq_list);
 		put_device(dev);
 
-		if (pm_wakeup_pending()) {
-			error = -EBUSY;
+		if (async_error)
 			break;
-		}
 	}
 	mutex_unlock(&dpm_list_mtx);
-	if (error)
+	async_synchronize_full();
+	if (!error)
+		error = async_error;
+	if (error) {
+		suspend_stats.failed_suspend_noirq++;
+		dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
 		dpm_resume_noirq(resume_event(state));
-	else
+	} else
 		dpm_show_time(starttime, state, "noirq");
 	return error;
 }
-- 
1.7.9.5

[PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late

[Liu, Chuansheng]

From: "Liu, Chuansheng" <chuansheng.liu@intel.com>

Just like commit 5af84b82701a and 97df8c12995, using the
asynchronous threads can improve the overall suspend_late
time significantly.

This patch is for suspend_late phase.

Signed-off-by: Liu, Chuansheng <chuansheng.liu@intel.com>
---
 drivers/base/power/main.c |   54 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 45 insertions(+), 9 deletions(-)

diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index ec946aa..19f5195 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -1094,7 +1094,7 @@ static int dpm_suspend_noirq(pm_message_t state)
  *
  * Runtime PM is disabled for @dev while this function is being executed.
  */
-static int device_suspend_late(struct device *dev, pm_message_t state)
+static int __device_suspend_late(struct device *dev, pm_message_t state)
 {
 	pm_callback_t callback = NULL;
 	char *info = NULL;
@@ -1102,6 +1102,14 @@ static int device_suspend_late(struct device *dev, pm_message_t state)
 
 	__pm_runtime_disable(dev, false);
 
+	if (async_error)
+		return 0;
+
+	if (pm_wakeup_pending()) {
+		async_error = -EBUSY;
+		return async_error;
+	}
+
 	if (dev->power.syscore)
 		return 0;
 
@@ -1127,9 +1135,35 @@ static int device_suspend_late(struct device *dev, pm_message_t state)
 	error = dpm_run_callback(callback, dev, state, info);
 	if (!error)
 		dev->power.is_late_suspended = true;
+	else
+		async_error = error;
 	return error;
 }
 
+static void async_suspend_late(void *data, async_cookie_t cookie)
+{
+	struct device *dev = (struct device *)data;
+	int error;
+
+	error = __device_suspend_late(dev, pm_transition);
+	if (error) {
+		dpm_save_failed_dev(dev_name(dev));
+		pm_dev_err(dev, pm_transition, " async", error);
+	}
+	put_device(dev);
+}
+
+static int device_suspend_late(struct device *dev)
+{
+	if (pm_async_enabled && dev->power.async_suspend) {
+		get_device(dev);
+		async_schedule(async_suspend_late, dev);
+		return 0;
+	}
+
+	return __device_suspend_late(dev, pm_transition);
+}
+
 /**
  * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
  * @state: PM transition of the system being carried out.
@@ -1140,19 +1174,20 @@ static int dpm_suspend_late(pm_message_t state)
 	int error = 0;
 
 	mutex_lock(&dpm_list_mtx);
+	pm_transition = state;
+	async_error = 0;
+
 	while (!list_empty(&dpm_suspended_list)) {
 		struct device *dev = to_device(dpm_suspended_list.prev);
 
 		get_device(dev);
 		mutex_unlock(&dpm_list_mtx);
 
-		error = device_suspend_late(dev, state);
+		error = device_suspend_late(dev);
 
 		mutex_lock(&dpm_list_mtx);
 		if (error) {
 			pm_dev_err(dev, state, " late", error);
-			suspend_stats.failed_suspend_late++;
-			dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
 			dpm_save_failed_dev(dev_name(dev));
 			put_device(dev);
 			break;
@@ -1161,15 +1196,16 @@ static int dpm_suspend_late(pm_message_t state)
 			list_move(&dev->power.entry, &dpm_late_early_list);
 		put_device(dev);
 
-		if (pm_wakeup_pending()) {
-			error = -EBUSY;
+		if (async_error)
 			break;
-		}
 	}
 	mutex_unlock(&dpm_list_mtx);
-	if (error)
+	async_synchronize_full();
+	if (error) {
+		suspend_stats.failed_suspend_late++;
+		dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
 		dpm_resume_early(resume_event(state));
-	else
+	} else
 		dpm_show_time(starttime, state, "late");
 
 	return error;
-- 
1.7.9.5

RE: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Li, Zhuangzhi]

> -----Original Message-----
> From: Liu, Chuansheng
> Sent: Monday, January 20, 2014 4:45 PM
> To: rjw@rjwysocki.net; gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len
> Cc: linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Liu, Chuansheng;
> Li, Zhuangzhi
> Subject: [PATCH 0/5] Enabling the asynchronous threads for other phases
> 
> Hello,
> 
> This patch series are for enabling the asynchronous threads for the phases
> resume_noirq, resume_early, suspend_noirq and suspend_late.
> 
> Just like commit 5af84b82701a and 97df8c12995, with async threads it will
> reduce the system suspending and resuming time significantly.
> 
> With these patches, in my test platform, it saved 80% time in resume_noirq
> phase.
> 
> Has done the suspend-resume stress test for a long time, please help to
> review.
> 
> Best Regards,
> 
> [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late

After applied the above five patches, there was no issue observed during 1000 cycles suspend/resume stress test on Baytrail platform.
Tested-by: lizhuangzhi <zhuangzhi.li@intel.com>
> 
>  drivers/base/power/main.c |  240
> ++++++++++++++++++++++++++++++++++++---------
>  include/linux/pm.h        |    2 +
>  2 files changed, 197 insertions(+), 45 deletions(-)

Re: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Rafael J. Wysocki]

On Monday, January 20, 2014 04:44:34 PM Liu, Chuansheng wrote:
> Hello,
> 
> This patch series are for enabling the asynchronous threads for the phases
> resume_noirq, resume_early, suspend_noirq and suspend_late.
> 
> Just like commit 5af84b82701a and 97df8c12995, with async threads it will
> reduce the system suspending and resuming time significantly.
> 
> With these patches, in my test platform, it saved 80% time in resume_noirq
> phase.
> 
> Has done the suspend-resume stress test for a long time, please help to
> review.
> 
> Best Regards,
> 
> [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late

I've applied this to the bleeding-edge branch of the linux-pm.git tree, with
minor changes related to coding style, white space etc.

Can you please verify that the bleeding-edge branch works for you as expected?

Rafael

RE: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Liu, Chuansheng]

Hello Rafael,

> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> Sent: Thursday, February 06, 2014 5:53 AM
> To: Liu, Chuansheng
> Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other phases
> 
> On Monday, January 20, 2014 04:44:34 PM Liu, Chuansheng wrote:
> > Hello,
> >
> > This patch series are for enabling the asynchronous threads for the phases
> > resume_noirq, resume_early, suspend_noirq and suspend_late.
> >
> > Just like commit 5af84b82701a and 97df8c12995, with async threads it will
> > reduce the system suspending and resuming time significantly.
> >
> > With these patches, in my test platform, it saved 80% time in resume_noirq
> > phase.
> >
> > Has done the suspend-resume stress test for a long time, please help to
> > review.
> >
> > Best Regards,
> >
> > [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> > [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> > [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> > [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> > [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late
> 
> I've applied this to the bleeding-edge branch of the linux-pm.git tree, with
> minor changes related to coding style, white space etc.
Thanks your help.

> 
> Can you please verify that the bleeding-edge branch works for you as
> expected?
I have picked them from your bleeding-edge branch and has done the
suspend-resume stress test for about 200 times and 3 hours,
It is still working well.

Best Regards
Chuansheng Liu

Re: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Rafael J. Wysocki]

On Monday, February 10, 2014 08:36:57 AM Liu, Chuansheng wrote:
> Hello Rafael,
> 
> > -----Original Message-----
> > From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> > Sent: Thursday, February 06, 2014 5:53 AM
> > To: Liu, Chuansheng
> > Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> > linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> > Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other phases
> > 
> > On Monday, January 20, 2014 04:44:34 PM Liu, Chuansheng wrote:
> > > Hello,
> > >
> > > This patch series are for enabling the asynchronous threads for the phases
> > > resume_noirq, resume_early, suspend_noirq and suspend_late.
> > >
> > > Just like commit 5af84b82701a and 97df8c12995, with async threads it will
> > > reduce the system suspending and resuming time significantly.
> > >
> > > With these patches, in my test platform, it saved 80% time in resume_noirq
> > > phase.
> > >
> > > Has done the suspend-resume stress test for a long time, please help to
> > > review.
> > >
> > > Best Regards,
> > >
> > > [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> > > [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> > > [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> > > [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> > > [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late
> > 
> > I've applied this to the bleeding-edge branch of the linux-pm.git tree, with
> > minor changes related to coding style, white space etc.
> Thanks your help.

Unfortunately, I've just realized that your patches don't add any mechanism
ensuring that parent devices' .suspend_noirq() will be called *after* the
.suspend_noirq() of all their children.  Of course, analogously for
.suspend_late() and for the resume part (where children have to wait for
their parents).

In the original async suspend/resume code that is implemented using
power.completion and I suppose you can do the same thing here.

I have to drop the series for the time being.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.

RE: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Liu, Chuansheng]

Hello Rafael,

> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> Sent: Monday, February 17, 2014 7:41 AM
> To: Liu, Chuansheng
> Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other phases
> 
> On Monday, February 10, 2014 08:36:57 AM Liu, Chuansheng wrote:
> > Hello Rafael,
> >
> > > -----Original Message-----
> > > From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> > > Sent: Thursday, February 06, 2014 5:53 AM
> > > To: Liu, Chuansheng
> > > Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> > > linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> > > Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other
> phases
> > >
> > > On Monday, January 20, 2014 04:44:34 PM Liu, Chuansheng wrote:
> > > > Hello,
> > > >
> > > > This patch series are for enabling the asynchronous threads for the
> phases
> > > > resume_noirq, resume_early, suspend_noirq and suspend_late.
> > > >
> > > > Just like commit 5af84b82701a and 97df8c12995, with async threads it
> will
> > > > reduce the system suspending and resuming time significantly.
> > > >
> > > > With these patches, in my test platform, it saved 80% time in
> resume_noirq
> > > > phase.
> > > >
> > > > Has done the suspend-resume stress test for a long time, please help to
> > > > review.
> > > >
> > > > Best Regards,
> > > >
> > > > [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> > > > [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> > > > [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> > > > [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> > > > [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late
> > >
> > > I've applied this to the bleeding-edge branch of the linux-pm.git tree, with
> > > minor changes related to coding style, white space etc.
> > Thanks your help.
> 
> Unfortunately, I've just realized that your patches don't add any mechanism
> ensuring that parent devices' .suspend_noirq() will be called *after* the
> .suspend_noirq() of all their children.  Of course, analogously for
> .suspend_late() and for the resume part (where children have to wait for
> their parents).
> 
> In the original async suspend/resume code that is implemented using
> power.completion and I suppose you can do the same thing here.

I think "parent devices suspend after their children" is not related directly
with using async or not;
In the original code, even without asyncing, the suspend/resume has the waiting
action, but there no waiting action for suspend_noirq and other phases.

If you think the parent waiting for children is necessary for suspend_noirq/suspend_late
/resume_early/resume_noirq, I can cook other series patches.

But we can separate them with current asyncing series patches. Agree?

RE: [PATCH 0/5] Enabling the asynchronous threads for other phases

[Liu, Chuansheng]

Hello Rafael,

> -----Original Message-----
> From: Liu, Chuansheng
> Sent: Monday, February 17, 2014 9:44 AM
> To: 'Rafael J. Wysocki'
> Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> Subject: RE: [PATCH 0/5] Enabling the asynchronous threads for other phases
> 
> Hello Rafael,
> 
> > -----Original Message-----
> > From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> > Sent: Monday, February 17, 2014 7:41 AM
> > To: Liu, Chuansheng
> > Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> > linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> > Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other phases
> >
> > On Monday, February 10, 2014 08:36:57 AM Liu, Chuansheng wrote:
> > > Hello Rafael,
> > >
> > > > -----Original Message-----
> > > > From: Rafael J. Wysocki [mailto:rjw@rjwysocki.net]
> > > > Sent: Thursday, February 06, 2014 5:53 AM
> > > > To: Liu, Chuansheng
> > > > Cc: gregkh@linuxfoundation.org; pavel@ucw.cz; Brown, Len;
> > > > linux-pm@vger.kernel.org; linux-kernel@vger.kernel.org; Li, Zhuangzhi
> > > > Subject: Re: [PATCH 0/5] Enabling the asynchronous threads for other
> > phases
> > > >
> > > > On Monday, January 20, 2014 04:44:34 PM Liu, Chuansheng wrote:
> > > > > Hello,
> > > > >
> > > > > This patch series are for enabling the asynchronous threads for the
> > phases
> > > > > resume_noirq, resume_early, suspend_noirq and suspend_late.
> > > > >
> > > > > Just like commit 5af84b82701a and 97df8c12995, with async threads it
> > will
> > > > > reduce the system suspending and resuming time significantly.
> > > > >
> > > > > With these patches, in my test platform, it saved 80% time in
> > resume_noirq
> > > > > phase.
> > > > >
> > > > > Has done the suspend-resume stress test for a long time, please help to
> > > > > review.
> > > > >
> > > > > Best Regards,
> > > > >
> > > > > [PATCH 1/5] PM: Adding two flags for async suspend_noirq and
> > > > > [PATCH 2/5] PM: Enabling the asynchronous threads for resume_noirq
> > > > > [PATCH 3/5] PM: Enabling the asyncronous threads for resume_early
> > > > > [PATCH 4/5] PM: Enabling the asyncronous threads for suspend_noirq
> > > > > [PATCH 5/5] PM: Enabling the asyncronous threads for suspend_late
> > > >
> > > > I've applied this to the bleeding-edge branch of the linux-pm.git tree, with
> > > > minor changes related to coding style, white space etc.
> > > Thanks your help.
> >
> > Unfortunately, I've just realized that your patches don't add any mechanism
> > ensuring that parent devices' .suspend_noirq() will be called *after* the
> > .suspend_noirq() of all their children.  Of course, analogously for
> > .suspend_late() and for the resume part (where children have to wait for
> > their parents).
> >
> > In the original async suspend/resume code that is implemented using
> > power.completion and I suppose you can do the same thing here.
> 
> I think "parent devices suspend after their children" is not related directly
> with using async or not;
> In the original code, even without asyncing, the suspend/resume has the
> waiting
> action, but there no waiting action for suspend_noirq and other phases.
> 
Sorry, re-checked the code, the order in the list has made sure the sequence
of parent-then-children when without asyncing.
Thanks your pointing out, will re-cook this series patch.