Commit-ID: 01b41159066531cc8d664362ff0cd89dd137bbfa
Gitweb: http://git.kernel.org/tip/01b41159066531cc8d664362ff0cd89dd137bbfa
Author: Lianwei Wang
AuthorDate: Thu, 9 Jun 2016 23:43:28 -0700
Committer: Thomas Gleixner
CommitDate: Fri, 2 Sep 2016 20:37:17 +0200
cpu/hotplug: Handle
On Thu, Jun 9, 2016 at 11:43 PM, Lianwei Wang wrote:
> Currently it just print a warning message but did not
> reset cpu_hotplug_disabled when the enable/disable is
> unbalanced. The unbalanced enable/disable will lead
> the cpu hotplug work abnormally.
>
> Do nothing if an
This makes pm notifier PREPARE/POST symmetrical: if PREPARE
fails, we will only undo what ever happened on PREPARE.
It fixes the unbalanced cpu hotplug enable in cpu pm notifier.
Signed-off-by: Lianwei Wang
---
kernel/power/hibernate.c | 20
kernel/power/main.c | 11
On Fri, Jun 10, 2016 at 7:00 AM, Rafael J. Wysocki wrote:
> On Thursday, June 09, 2016 11:47:32 PM Lianwei Wang wrote:
>> This makes pm notifier PREPARE/POST symmetrical: if PREPARE
>> fails, we will only undo what ever happened on PREPARE.
>>
>> It fixes the unbalance
This makes pm notifier PREPARE/POST symmetrical: if PREPARE
fails, we will only undo what ever happened on PREPARE.
It fixes the unbalanced cpu hotplug enable in cpu pm notifier.
Signed-off-by: Lianwei Wang
---
kernel/power/hibernate.c | 20
kernel/power/main.c | 11
Currently it just print a warning message but did not
reset cpu_hotplug_disabled when the enable/disable is
unbalanced. The unbalanced enable/disable will lead
the cpu hotplug work abnormally.
Do nothing if an unablanced hotplug enable detected.
Signed-off-by: Lianwei Wang
---
kernel/cpu.c
On Mon, Jun 6, 2016 at 11:34 PM, Thomas Gleixner wrote:
> On Mon, 6 Jun 2016, Lianwei Wang wrote:
>> Currently it just print a warning message but did not
>> reset cpu_hotplug_disabled when the enable/disable is
>> unbalanced. The unbalanced enable/disable will lead
&g
Currently it just print a warning message but did not
reset cpu_hotplug_disabled when the enable/disable is
unbalanced. The unbalanced enable/disable will lead
the cpu hotplug work abnormally.
Do nothing if an unablanced hotplug enable detected.
Signed-off-by: Lianwei Wang
---
kernel/cpu.c
On Wed, May 18, 2016 at 11:06 PM, Lianwei Wang wrote:
> On Wed, May 18, 2016 at 1:34 PM, Rafael J. Wysocki wrote:
>> On Wed, May 18, 2016 at 8:07 AM, Lianwei Wang wrote:
>>> This makes pm notifier PREPARE/POST symmetrical: if PREPARE
>>> fails, we will only undo wh
On Thu, May 12, 2016 at 1:06 AM, Lianwei Wang wrote:
> I have come up a patch to make the pm notifier called symmetrically
> and currently being tested. I will send it out after pass the test.
>
> On Fri, May 6, 2016 at 12:18 AM, Thomas Gleixner wrote:
>> On Fri, 6 May 2016,
On Wed, May 18, 2016 at 1:34 PM, Rafael J. Wysocki wrote:
> On Wed, May 18, 2016 at 8:07 AM, Lianwei Wang wrote:
>> This makes pm notifier PREPARE/POST symmetrical: if PREPARE
>> fails, we will only undo what ever happened on PREPARE.
>>
>> It fixes the unbalanced c
This makes pm notifier PREPARE/POST symmetrical: if PREPARE
fails, we will only undo what ever happened on PREPARE.
It fixes the unbalanced cpu hotplug enable in cpu pm notifier.
Signed-off-by: Lianwei Wang
---
kernel/power/hibernate.c | 20
kernel/power/main.c | 11
I have come up a patch to make the pm notifier called symmetrically
and currently being tested. I will send it out after pass the test.
On Fri, May 6, 2016 at 12:18 AM, Thomas Gleixner wrote:
> On Fri, 6 May 2016, Lianwei Wang wrote:
>> On Thu, May 5, 2016 at 5:13 AM, Thomas Gleixn
On Thu, May 5, 2016 at 5:13 AM, Thomas Gleixner wrote:
> On Wed, 4 May 2016, Lianwei Wang wrote:
>> In this example, the unbalanced count is caused by the
>> cpu_hotplug_pm_callback pm notifier callback function.
>
> I doubt that.
>
>> We can add a variable t
On Mon, May 2, 2016 at 1:11 AM, Thomas Gleixner wrote:
> On Fri, 29 Apr 2016, Lianwei Wang wrote:
>> On Thu, Apr 28, 2016 at 5:44 PM, Thomas Gleixner wrote:
>> > Wrong. This is the symptom. The root cause is in #1. Therefor you are
>> > trying
>> > to fi
On Thu, Apr 28, 2016 at 5:44 PM, Thomas Gleixner wrote:
> On Thu, 28 Apr 2016, Lianwei Wang wrote:
>> On Wed, Apr 27, 2016 at 11:15 PM, Thomas Gleixner wrote:
>> > On Wed, 27 Apr 2016, Lianwei Wang wrote:
>> >> Yes. In our project, there is a kernel driver which re
On Wed, Apr 27, 2016 at 11:15 PM, Thomas Gleixner wrote:
> On Wed, 27 Apr 2016, Lianwei Wang wrote:
>> Yes. In our project, there is a kernel driver which register a pm
>> notifier. On some conditions this pm notifier will return an error and
>> abort the suspend process
On Wed, Apr 27, 2016 at 3:17 AM, Thomas Gleixner wrote:
> On Mon, 25 Apr 2016, Lianwei Wang wrote:
>> On Mon, Apr 25, 2016 at 1:22 AM, Thomas Gleixner wrote:
>> >> Anyway, from a product perspective way, if we don't want to restore
>> >> the unbalanced cou
On Mon, Apr 25, 2016 at 1:22 AM, Thomas Gleixner wrote:
> On Fri, 22 Apr 2016, Lianwei Wang wrote:
>> Any way is Ok for debugging purpose. But think the kernel run on a
>> customer machine, such as PC, Mobile phone or other devices. How we
>> let the customer debug it but n
On Fri, Apr 22, 2016 at 9:37 AM, Thomas Gleixner wrote:
> On Fri, 22 Apr 2016, Lianwei Wang wrote:
>
>> On Thu, Apr 21, 2016 at 3:50 AM, Peter Zijlstra wrote:
>> > On Wed, Apr 20, 2016 at 09:56:07PM -0700, Lianwei Wang wrote:
>> >> Currently it just pr
On Thu, Apr 21, 2016 at 3:50 AM, Peter Zijlstra wrote:
> On Wed, Apr 20, 2016 at 09:56:07PM -0700, Lianwei Wang wrote:
>> Currently it just print a warning message but did not
>> reset cpu_hotplug_disabled when the enable/disable is
>> unbalanced. The unbalanced enable/dis
Currently it just print a warning message but did not
reset cpu_hotplug_disabled when the enable/disable is
unbalanced. The unbalanced enable/disable will lead
the cpu hotplug work abnormally.
Reset it to 0 when an unablanced enable detected.
Signed-off-by: Lianwei Wang
---
kernel/cpu.c | 21
On Sat, Apr 2, 2016 at 6:10 AM, Daniel Lezcano
wrote:
> On 04/02/2016 08:15 AM, Lianwei Wang wrote:
>>>
>>>
>>> * Lianwei Wang wrote:
>>>
>>>> The wake_up_all_idle_cpus API always wake up all the online
>>>> cpus, but sometimes we
>
> * Lianwei Wang wrote:
>
>> The wake_up_all_idle_cpus API always wake up all the online
>> cpus, but sometimes we only want to wake up a set of cpus.
>> Use a generic function to wake up a group of cpus that is
>> specified by the cpumask parameter. This generi
.
Signed-off-by: Lianwei Wang
---
drivers/cpuidle/cpuidle.c | 4 ++--
include/linux/smp.h | 4 ++--
kernel/power/suspend.c| 2 +-
kernel/smp.c | 12 +++-
4 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle
atch is applied to the wrong git tree, please drop us a note to
> help improving the system]
>
> url:
> https://github.com/0day-ci/linux/commits/Lianwei-Wang/smp-make-wake-up-idle-cpus-more-generic/20160331-155548
> base: https://git.kernel.org/pub/scm/linux/kernel/git/raf
.
Signed-off-by: Lianwei Wang
---
drivers/cpuidle/cpuidle.c | 4 ++--
include/linux/smp.h | 4 ++--
kernel/power/suspend.c| 2 +-
kernel/smp.c | 12 +++-
4 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle
On Mon, Nov 23, 2015 at 9:57 AM, Peter Zijlstra wrote:
> On Mon, Nov 23, 2015 at 09:42:06AM -0800, Lianwei Wang wrote:
>> Issue was found on ARM/Qcom platform, but I think it is applicable to
>> other platforms as well. I add a BUG_ON after rcu_enter_idle to catch
>> i
:02:02AM -0800, Lianwei Wang wrote:
>> The rcu_idle_endter may call wakeup_softirqd to set the need resched
>> flag on idle process. But if we don't check it after that, then the
>> cpu will enter idle state with RESCHED flag set and can not be woken
>> up by wakeup/resch
e the cpu is able
to be out of idle immediatley to run other tasks.
Signed-off-by: Lianwei Wang
---
kernel/sched/idle.c | 16
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 4a2ef5a02fd3..6e96a1f41041 100644
--- a/k
+
return NOTIFY_OK;
}
2013/5/13 Lianwei Wang :
> Thank you. Patch is updated.
>
> From 2d0b4afb5461847dcdf08a87b02015d061b12e85 Mon Sep 17 00:00:00 2001
> From: Lianwei Wang
> Date: Fri, 26 Apr 2013 10:59:24 +0800
> Subject: [PATCH] cpuidle: wakeup processor on a smaller lat
Thank you. Patch is updated.
>From 2d0b4afb5461847dcdf08a87b02015d061b12e85 Mon Sep 17 00:00:00 2001
From: Lianwei Wang
Date: Fri, 26 Apr 2013 10:59:24 +0800
Subject: [PATCH] cpuidle: wakeup processor on a smaller latency
Checking the PM-Qos latency and cpu idle sleep latency, and only
wak
long)l < (long)s) {
+ smp_call_function_single(cpu, smp_callback, NULL, 1);
+ }
+ }
+
return NOTIFY_OK;
}
Thanks,
Lianwei
2013/5/8 Daniel Lezcano :
> On 05/08/2013 04:44 AM, Lianwei Wang wrote:
>> When a PM-Qos is updated, the cpuidle dri
When a PM-Qos is updated, the cpuidle driver will wakeup all the CPUs
no matter what a latency is set. But actually it only need to wakeup
the CPUs when a shorter latency is set. In this way we can reduce the
cpu wakeup count and save battery.
So we can pass the prev_value to the notifier callback
b 21, 2013 at 02:19:21PM +0800, Lianwei Wang wrote:
>> Hi Tejun Heo and all,
>>
>> The commit of "34b087e freezer: kill unused
>> set_freezable_with_signal()" remove recalc_sigpending*() calls in
>> freezer, so the user tasks get TIF_SIGPENDING fake signal that
9166b0853 Mon Sep 17 00:00:00 2001
From: Lianwei Wang
Date: Mon, 21 Jan 2013 18:21:26 +0800
Subject: [PATCH] freezer: add fake signal clearing back when thaw task
The fake TIF_SIGPENDING is set during freeze userspace process, but it
is not cleared when thaw tasks after below commit:
34b087e
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