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

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Date: Thu, 29 Feb 2024 22:20:07 +0800
From: Xiongwei Song <xiongwei.song@...driver.com>
To: <longman@...hat.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: [PATCH 2/2] cgroup/cpuset: Mark memory_spread_slab as obsolete

We've removed the SLAG allocator, cpuset_do_slab_mem_spread() and
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,
-- 
2.43.0