on 10/25/2016 06:09 PM, Marc Zyngier wrote:
> On 15/10/16 08:23, Cheng Chao wrote:
>> On 10/15/2016 01:33 AM, Marc Zyngier wrote:
>>>> on 10/13/2016 11:31 PM, Marc Zyngier wrote:
>>>>> On Thu, 13 Oct 2016 18:57:14 +0800
>>>>> Cheng Chao wro
On 10/15/2016 01:33 AM, Marc Zyngier wrote:
on 10/13/2016 11:31 PM, Marc Zyngier wrote:
On Thu, 13 Oct 2016 18:57:14 +0800
Cheng Chao wrote:
GIC can distribute an interrupt to more than one cpu,
but now, gic_set_affinity sets only one cpu to handle interrupt.
What makes you think this is a
Marc,
Thanks for your comments.
Cheng
on 10/13/2016 11:31 PM, Marc Zyngier wrote:
> On Thu, 13 Oct 2016 18:57:14 +0800
> Cheng Chao wrote:
>
>> GIC can distribute an interrupt to more than one cpu,
>> but now, gic_set_affinity sets only one cpu to handle interrupt.
>
Hi,
This patch has been tested on the SOC: ti AM572x and hisilicon hi35xx, it works.
Please review this patch. Any suggestions will be welcome,thanks.
Cheng
on 10/13/2016 06:57 PM, Cheng Chao wrote:
> GIC can distribute an interrupt to more than one cpu,
> but now, gic_set_affinity set
GIC can distribute an interrupt to more than one cpu,
but now, gic_set_affinity sets only one cpu to handle interrupt.
Signed-off-by: Cheng Chao
---
drivers/irqchip/irq-gic.c | 28
1 file changed, 24 insertions(+), 4 deletions(-)
diff --git a/drivers/irqchip/irq
Commit-ID: bf89a304722f6904009499a31dc68ab9a5c9742e
Gitweb: http://git.kernel.org/tip/bf89a304722f6904009499a31dc68ab9a5c9742e
Author: Cheng Chao
AuthorDate: Wed, 14 Sep 2016 10:01:50 +0800
Committer: Ingo Molnar
CommitDate: Thu, 22 Sep 2016 14:53:45 +0200
stop_machine: Avoid a sleep
Commit-ID: 0b8473570ce1af3e80da05b59f9321f30253de4d
Gitweb: http://git.kernel.org/tip/0b8473570ce1af3e80da05b59f9321f30253de4d
Author: Cheng Chao
AuthorDate: Wed, 14 Sep 2016 10:18:56 +0800
Committer: Ingo Molnar
CommitDate: Thu, 22 Sep 2016 14:53:44 +0200
sched/core: Remove
Hi Peter,
What should I do next? Thanks.
Cheng
on 09/14/2016 10:01 AM, Cheng Chao wrote:
> In case @cpu == smp_proccessor_id(), we can avoid a sleep+wakeup
> by doing a preemption.
>
> the caller such as sched_exec can benefit from this change.
>
> Signed-off-by: Chen
Hi Peter,
Would you please review this patch? thanks.
Cheng
on 09/14/2016 10:23 AM, Cheng Chao wrote:
> init_idle() is called immediately after current->sched_class
> = &fair_sched_class, init_idle() sets current->sched_class
> = &idle_sched_class.
>
> Signed-
init_idle() is called immediately after current->sched_class
= &fair_sched_class, init_idle() sets current->sched_class
= &idle_sched_class.
Signed-off-by: Cheng Chao
Cc: sta...@vger.kernel.org
---
kernel/sched/core.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/kernel/
init_idle() is called immediately after current->sched_class
= &fair_sched_class, init_idle() sets current->sched_class
= &idle_sched_class.
Signed-off-by: Cheng Chao
Cc: sta...@vger.kernel.org
---
kernel/sched/core.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/kernel/
great, __schedule() doesn't need pay any attention to the TASK_DEAD now.
on 09/14/2016 12:37 AM, Peter Zijlstra wrote:
> On Tue, Sep 13, 2016 at 06:14:27PM +0200, Oleg Nesterov wrote:
>
>> Me too, and I failed to find something which could be broken... So
>> perhaps should make it nop and invest
In case @cpu == smp_proccessor_id(), we can avoid a sleep+wakeup
by doing a preemption.
the caller such as sched_exec can benefit from this change.
Signed-off-by: Cheng Chao
Cc: Oleg Nesterov
Cc: Peter Zijlstra
---
kernel/sched/core.c | 8 ++--
kernel/stop_machine.c | 5 +
2 files
Peter, thank you.
on 09/12/2016 07:41 PM, Peter Zijlstra wrote:
> On Mon, Sep 12, 2016 at 01:37:27PM +0200, Peter Zijlstra wrote:
>> So what you're saying is that migration_stop_cpu() doesn't work because
>> wait_for_completion() dequeues the task.
>>
>> True I suppose. Not sure I like your soluti
on 09/12/2016 07:03 PM, Oleg Nesterov wrote:
> On 09/10, Cheng Chao wrote:
>>
>> @@ -126,6 +126,17 @@ int stop_one_cpu(unsigned int cpu, cpu_stop_fn_t fn,
>> void *arg)
>> cpu_stop_init_done(&done, 1);
>> if (!cpu_stop_queue_work(cpu, &
hi Peter, I guess you can receive the mail from me now,
I have changed the mailbox to gmail.
Oleg has already done much work for this patch, I am really obliged.
please review this patch, thanks.
on 09/10/2016 04:52 PM, Cheng Chao wrote:
> For CONFIG_PREEMPT_NONE=y, when sched_exec() ne
task TASK_RUNNING instead of TASK_UNINTERRUPTIBLE,
so the migration_cpu_stop() can do useful works.
Signed-off-by: Cheng Chao
---
kernel/stop_machine.c | 11 +++
1 file changed, 11 insertions(+)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 4a1ca5f..41aea5e 100644
--- a/ke
task TASK_RUNNING instead of TASK_UNINTERRUPTIBLE,
so the migration_cpu_stop() can do useful works.
Signed-off-by: Cheng Chao
---
kernel/stop_machine.c | 11 +++
1 file changed, 11 insertions(+)
diff --git a/kernel/stop_machine.c b/kernel/stop_machine.c
index 4a1ca5f..41aea5e 100644
--- a/ke
init_idle() is called immediately after current->sched_class
= &fair_sched_class; and init_idle() sets current->sched_class
= &idle_sched_class.
Signed-off-by: cheng chao
---
kernel/sched/core.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/kernel/sched/core.c b/kerne
more further
it makes more simpler for CONFIG_PREEMPT=y or CONFIG_PREEMPT_VOLUNTARY=y
when sched_exec needs migration.
Signed-off-by: cheng chao
---
include/linux/stop_machine.h | 1 +
kernel/sched/core.c | 2 +-
kernel/stop_machine.c| 21 +
3 files changed
init_idle will set current->sched_class = &idle_sched_class
Signed-off-by: cheng chao
---
kernel/sched/core.c | 5 -
1 file changed, 5 deletions(-)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 556cb07..2f7c08d 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched
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