* [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
@ 2024-04-20 9:46 Xiu Jianfeng
2024-04-22 18:34 ` Waiman Long
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Xiu Jianfeng @ 2024-04-20 9:46 UTC (permalink / raw)
To: longman, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
Initializing top_cpuset.relax_domain_level and setting
CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
completed at the time of top_cpuset definition by compiler.
Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
---
kernel/cgroup/cpuset.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index d8d3439eda4e..e70008a1d86a 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -369,8 +369,9 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
static struct cpuset top_cpuset = {
.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
- (1 << CS_MEM_EXCLUSIVE)),
+ (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
.partition_root_state = PRS_ROOT,
+ .relax_domain_level = -1,
.remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
};
@@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
nodes_setall(top_cpuset.effective_mems);
fmeter_init(&top_cpuset.fmeter);
- set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
- top_cpuset.relax_domain_level = -1;
INIT_LIST_HEAD(&remote_children);
BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
--
2.34.1
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-20 9:46 [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset Xiu Jianfeng
@ 2024-04-22 18:34 ` Waiman Long
2024-04-22 19:52 ` Tejun Heo
2024-04-23 19:21 ` Klara Modin
2 siblings, 0 replies; 7+ messages in thread
From: Waiman Long @ 2024-04-22 18:34 UTC (permalink / raw)
To: Xiu Jianfeng, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
On 4/20/24 05:46, Xiu Jianfeng wrote:
> Initializing top_cpuset.relax_domain_level and setting
> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
> completed at the time of top_cpuset definition by compiler.
>
> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
> ---
> kernel/cgroup/cpuset.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index d8d3439eda4e..e70008a1d86a 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -369,8 +369,9 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
>
> static struct cpuset top_cpuset = {
> .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
> - (1 << CS_MEM_EXCLUSIVE)),
> + (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
> .partition_root_state = PRS_ROOT,
> + .relax_domain_level = -1,
> .remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
> };
>
> @@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
> nodes_setall(top_cpuset.effective_mems);
>
> fmeter_init(&top_cpuset.fmeter);
> - set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
> - top_cpuset.relax_domain_level = -1;
> INIT_LIST_HEAD(&remote_children);
>
> BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
Reviewed-by: Waiman Long <longman@redhat.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-20 9:46 [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset Xiu Jianfeng
2024-04-22 18:34 ` Waiman Long
@ 2024-04-22 19:52 ` Tejun Heo
2024-04-23 19:21 ` Klara Modin
2 siblings, 0 replies; 7+ messages in thread
From: Tejun Heo @ 2024-04-22 19:52 UTC (permalink / raw)
To: Xiu Jianfeng; +Cc: longman, lizefan.x, hannes, cgroups, linux-kernel
On Sat, Apr 20, 2024 at 09:46:16AM +0000, Xiu Jianfeng wrote:
> Initializing top_cpuset.relax_domain_level and setting
> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
> completed at the time of top_cpuset definition by compiler.
>
> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Applied to cgroup/for-6.10.
Thanks.
--
tejun
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-20 9:46 [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset Xiu Jianfeng
2024-04-22 18:34 ` Waiman Long
2024-04-22 19:52 ` Tejun Heo
@ 2024-04-23 19:21 ` Klara Modin
2024-04-23 19:50 ` Waiman Long
2024-04-24 0:56 ` xiujianfeng
2 siblings, 2 replies; 7+ messages in thread
From: Klara Modin @ 2024-04-23 19:21 UTC (permalink / raw)
To: Xiu Jianfeng, longman, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 1453 bytes --]
Hi,
On 2024-04-20 11:46, Xiu Jianfeng wrote:
> Initializing top_cpuset.relax_domain_level and setting
> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
> completed at the time of top_cpuset definition by compiler.
>
> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
> ---
> kernel/cgroup/cpuset.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index d8d3439eda4e..e70008a1d86a 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -369,8 +369,9 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
>
> static struct cpuset top_cpuset = {
> .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
> - (1 << CS_MEM_EXCLUSIVE)),
> + (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
You dropped a '<' for the bitwise shift, this causes bad cpu utilization
for me.
> .partition_root_state = PRS_ROOT,
> + .relax_domain_level = -1,
> .remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
> };
>
> @@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
> nodes_setall(top_cpuset.effective_mems);
>
> fmeter_init(&top_cpuset.fmeter);
> - set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
> - top_cpuset.relax_domain_level = -1;
> INIT_LIST_HEAD(&remote_children);
>
> BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
Kind regards,
Klara Modin
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[-- Attachment #3: 0001-cgroup-cpuset-fix-bitwise-shift-in-top_cpuset-initia.patch --]
[-- Type: text/x-patch, Size: 1065 bytes --]
From dfc9b104bb62ac7d0546be445ce6add9e6d8c2fe Mon Sep 17 00:00:00 2001
From: Klara Modin <klarasmodin@gmail.com>
Date: Tue, 23 Apr 2024 21:00:56 +0200
Subject: [PATCH] cgroup/cpuset: fix bitwise shift in top_cpuset initialization
Fixes: 8996f93fc388 ("cgroup/cpuset: Statically initialize more members of top_cpuset")
Signed-off-by: Klara Modin <klarasmodin@gmail.com>
---
kernel/cgroup/cpuset.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index e70008a1d86a..62d649d02f11 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -369,7 +369,7 @@ static inline void notify_partition_change(struct cpuset *cs, int old_prs)
static struct cpuset top_cpuset = {
.flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
- (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
+ (1 << CS_MEM_EXCLUSIVE) | (1 << CS_SCHED_LOAD_BALANCE)),
.partition_root_state = PRS_ROOT,
.relax_domain_level = -1,
.remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
--
2.44.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-23 19:21 ` Klara Modin
@ 2024-04-23 19:50 ` Waiman Long
2024-04-23 19:59 ` Klara Modin
2024-04-24 0:56 ` xiujianfeng
1 sibling, 1 reply; 7+ messages in thread
From: Waiman Long @ 2024-04-23 19:50 UTC (permalink / raw)
To: Klara Modin, Xiu Jianfeng, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
On 4/23/24 15:21, Klara Modin wrote:
> Hi,
>
> On 2024-04-20 11:46, Xiu Jianfeng wrote:
>> Initializing top_cpuset.relax_domain_level and setting
>> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
>> completed at the time of top_cpuset definition by compiler.
>>
>> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
>> ---
>> kernel/cgroup/cpuset.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
>> index d8d3439eda4e..e70008a1d86a 100644
>> --- a/kernel/cgroup/cpuset.c
>> +++ b/kernel/cgroup/cpuset.c
>> @@ -369,8 +369,9 @@ static inline void notify_partition_change(struct
>> cpuset *cs, int old_prs)
>> static struct cpuset top_cpuset = {
>> .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
>> - (1 << CS_MEM_EXCLUSIVE)),
>> + (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
>
> You dropped a '<' for the bitwise shift, this causes bad cpu
> utilization for me.
Oh, now load_balancing is disable by default in the root cgroup. That is
bad. Will post a patch to fix it.
Thanks,
Longman
>
>> .partition_root_state = PRS_ROOT,
>> + .relax_domain_level = -1,
>> .remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
>> };
>> @@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
>> nodes_setall(top_cpuset.effective_mems);
>> fmeter_init(&top_cpuset.fmeter);
>> - set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
>> - top_cpuset.relax_domain_level = -1;
>> INIT_LIST_HEAD(&remote_children);
>> BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
>
> Kind regards,
> Klara Modin
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-23 19:50 ` Waiman Long
@ 2024-04-23 19:59 ` Klara Modin
0 siblings, 0 replies; 7+ messages in thread
From: Klara Modin @ 2024-04-23 19:59 UTC (permalink / raw)
To: Waiman Long, Xiu Jianfeng, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
On 2024-04-23 21:50, Waiman Long wrote:
>
> On 4/23/24 15:21, Klara Modin wrote:
>> Hi,
>>
>> On 2024-04-20 11:46, Xiu Jianfeng wrote:
>>> Initializing top_cpuset.relax_domain_level and setting
>>> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
>>> completed at the time of top_cpuset definition by compiler.
>>>
>>> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
>>> ---
>>> kernel/cgroup/cpuset.c | 5 ++---
>>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
>>> index d8d3439eda4e..e70008a1d86a 100644
>>> --- a/kernel/cgroup/cpuset.c
>>> +++ b/kernel/cgroup/cpuset.c
>>> @@ -369,8 +369,9 @@ static inline void notify_partition_change(struct
>>> cpuset *cs, int old_prs)
>>> static struct cpuset top_cpuset = {
>>> .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
>>> - (1 << CS_MEM_EXCLUSIVE)),
>>> + (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
>>
>> You dropped a '<' for the bitwise shift, this causes bad cpu
>> utilization for me.
>
> Oh, now load_balancing is disable by default in the root cgroup. That is
> bad. Will post a patch to fix it.
>
> Thanks,
> Longman
>
I attached one in my previous message, though I'm still very new at this
and may have missed something.
Regards,
Klara Modin
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset
2024-04-23 19:21 ` Klara Modin
2024-04-23 19:50 ` Waiman Long
@ 2024-04-24 0:56 ` xiujianfeng
1 sibling, 0 replies; 7+ messages in thread
From: xiujianfeng @ 2024-04-24 0:56 UTC (permalink / raw)
To: Klara Modin, longman, lizefan.x, tj, hannes; +Cc: cgroups, linux-kernel
On 2024/4/24 3:21, Klara Modin wrote:
> Hi,
>
> On 2024-04-20 11:46, Xiu Jianfeng wrote:
>> Initializing top_cpuset.relax_domain_level and setting
>> CS_SCHED_LOAD_BALANCE to top_cpuset.flags in cpuset_init() could be
>> completed at the time of top_cpuset definition by compiler.
>>
>> Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
>> ---
>> kernel/cgroup/cpuset.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
>> index d8d3439eda4e..e70008a1d86a 100644
>> --- a/kernel/cgroup/cpuset.c
>> +++ b/kernel/cgroup/cpuset.c
>> @@ -369,8 +369,9 @@ static inline void notify_partition_change(struct
>> cpuset *cs, int old_prs)
>> static struct cpuset top_cpuset = {
>> .flags = ((1 << CS_ONLINE) | (1 << CS_CPU_EXCLUSIVE) |
>> - (1 << CS_MEM_EXCLUSIVE)),
>> + (1 << CS_MEM_EXCLUSIVE) | (1 < CS_SCHED_LOAD_BALANCE)),
>
> You dropped a '<' for the bitwise shift, this causes bad cpu utilization
> for me.
Oops, that's bad, I'm sorry for that!
>
>> .partition_root_state = PRS_ROOT,
>> + .relax_domain_level = -1,
>> .remote_sibling = LIST_HEAD_INIT(top_cpuset.remote_sibling),
>> };
>> @@ -4309,8 +4310,6 @@ int __init cpuset_init(void)
>> nodes_setall(top_cpuset.effective_mems);
>> fmeter_init(&top_cpuset.fmeter);
>> - set_bit(CS_SCHED_LOAD_BALANCE, &top_cpuset.flags);
>> - top_cpuset.relax_domain_level = -1;
>> INIT_LIST_HEAD(&remote_children);
>> BUG_ON(!alloc_cpumask_var(&cpus_attach, GFP_KERNEL));
>
> Kind regards,
> Klara Modin
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2024-04-24 0:57 UTC | newest]
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2024-04-20 9:46 [PATCH -next] cgroup/cpuset: Statically initialize more members of top_cpuset Xiu Jianfeng
2024-04-22 18:34 ` Waiman Long
2024-04-22 19:52 ` Tejun Heo
2024-04-23 19:21 ` Klara Modin
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