linux-kernel - Re: [PATCH v2 05/11] cgroup/cpuset-v1: Add deprecation messages to mem_exclusive and mem

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Message-ID: <130b167a-7fc7-499d-bb5f-a06638c3c1db@redhat.com>
Date: Tue, 11 Mar 2025 11:08:48 -0400
From: Waiman Long <llong@...hat.com>
To: Michal Koutný <mkoutny@...e.com>,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Tejun Heo <tj@...nel.org>, Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH v2 05/11] cgroup/cpuset-v1: Add deprecation messages to
 mem_exclusive and mem_hardwall


On 3/11/25 8:36 AM, Michal Koutný wrote:
> The concept of exclusive memory affinity may require complex approaches
> like with cpuset v2 cpu partitions. There is so far no implementation in
> cpuset v2.
> Specific kernel memory affinity may cause unintended (global)
> bottlenecks like kmem limits.
>
> Signed-off-by: Michal Koutný <mkoutny@...e.com>
> ---
>   kernel/cgroup/cpuset-v1.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/kernel/cgroup/cpuset-v1.c b/kernel/cgroup/cpuset-v1.c
> index fea8a0cb7ae1d..b243bdd952d78 100644
> --- a/kernel/cgroup/cpuset-v1.c
> +++ b/kernel/cgroup/cpuset-v1.c
> @@ -424,9 +424,11 @@ static int cpuset_write_u64(struct cgroup_subsys_state *css, struct cftype *cft,
>   		retval = cpuset_update_flag(CS_CPU_EXCLUSIVE, cs, val);
>   		break;
>   	case FILE_MEM_EXCLUSIVE:
> +		pr_info_once("cpuset.%s is deprecated\n", cft->name);
>   		retval = cpuset_update_flag(CS_MEM_EXCLUSIVE, cs, val);
>   		break;
>   	case FILE_MEM_HARDWALL:
> +		pr_info_once("cpuset.%s is deprecated\n", cft->name);
>   		retval = cpuset_update_flag(CS_MEM_HARDWALL, cs, val);
>   		break;
>   	case FILE_SCHED_LOAD_BALANCE:
Acked-by: Waiman Long <longman@...hat.com>