linux-kernel - Re: [PATCH 2/2] cgroup/cpuset: Mark memory_spread

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Message-ID: <9d04f0c6-c4f4-407a-af0c-eda8328fd22a@redhat.com>
Date: Thu, 29 Feb 2024 09:30:39 -0500
From: Waiman Long <longman@...hat.com>
To: Xiongwei Song <xiongwei.song@...driver.com>, lizefan.x@...edance.com,
 tj@...nel.org, hannes@...xchg.org, corbet@....net
Cc: vbabka@...e.cz, yosryahmed@...gle.com, rostedt@...dmis.org, cl@...ux.com,
 chengming.zhou@...ux.dev, zhengyejian1@...wei.com, cgroups@...r.kernel.org,
 linux-mmc@...r.kernel.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cgroup/cpuset: Mark memory_spread_slab as obsolete

On 2/29/24 09:20, Xiongwei Song wrote:
> We've removed the SLAG allocator, cpuset_do_slab_mem_spread() and

Typo: "SLAG" --> SLAB.

Other than that,

Acked-by: Waiman Long <longman@...hat.com>

> SLAB_MEM_SPREAD, memory_spread_slab is a no-op now. We can mark
> memory_spread_slab as obsolete in case someone still wants to use it
> after cpuset_do_slab_mem_spread() removed. For more details, please
> check [1].
>
> [1] https://lore.kernel.org/lkml/32bc1403-49da-445a-8c00-9686a3b0d6a3@redhat.com/T/#m8e292e21b00f95a4bb8086371fa7387fa4ea8f60
>
> Signed-off-by: Xiongwei Song <xiongwei.song@...driver.com>
> ---
>   Documentation/admin-guide/cgroup-v1/cpusets.rst | 2 +-
>   kernel/cgroup/cpuset.c                          | 3 +++
>   2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/admin-guide/cgroup-v1/cpusets.rst b/Documentation/admin-guide/cgroup-v1/cpusets.rst
> index ae646d621a8a..88d0e7fa2ee0 100644
> --- a/Documentation/admin-guide/cgroup-v1/cpusets.rst
> +++ b/Documentation/admin-guide/cgroup-v1/cpusets.rst
> @@ -179,7 +179,7 @@ files describing that cpuset:
>    - cpuset.mem_hardwall flag:  is memory allocation hardwalled
>    - cpuset.memory_pressure: measure of how much paging pressure in cpuset
>    - cpuset.memory_spread_page flag: if set, spread page cache evenly on allowed nodes
> - - cpuset.memory_spread_slab flag: if set, spread slab cache evenly on allowed nodes
> + - cpuset.memory_spread_slab flag: IT'S OBSOLETE. Please don't use it anymore
>    - cpuset.sched_load_balance flag: if set, load balance within CPUs on that cpuset
>    - cpuset.sched_relax_domain_level: the searching range when migrating tasks
>   
> diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
> index ba36c073304a..728d06fe9382 100644
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> @@ -3897,6 +3897,9 @@ static struct cftype legacy_files[] = {
>   	},
>   
>   	{
> +		/* It's obsolete. Please don't use it anymore. We will remove it
> +		 * in the future.
> +		 */
>   		.name = "memory_spread_slab",
>   		.read_u64 = cpuset_read_u64,
>   		.write_u64 = cpuset_write_u64,