From: Muchun Song <muchun.song@linux.dev>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Shakeel Butt <shakeelb@google.com>,
cgroups@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [PATCH] mm/memcg: remove definition of MEM_CGROUP_ID_MAX when !CONFIG_MEMCG
Date: Fri, 7 Jul 2023 09:47:46 +0800 [thread overview]
Message-ID: <892B507C-CFE8-4792-BA5F-3C698290A8EE@linux.dev> (raw)
In-Reply-To: <20230706112820.2393447-1-linmiaohe@huawei.com>
> On Jul 6, 2023, at 19:28, Miaohe Lin <linmiaohe@huawei.com> wrote:
>
> MEM_CGROUP_ID_MAX is only used when CONFIG_MEMCG is configured. Remove
> unneeded !CONFIG_MEMCG variant.
>
> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
MEM_CGROUP_ID_MAX is also only used in mem_cgroup_alloc(), maybe you also
could move it from memcontrol.h to memcontrol.c. And define it as:
#define MEM_CGROUP_ID_MAX ((1U << MEM_CGROUP_ID_SHIFT) - 1)
I am not suggesting defining it as USHRT_MAX, because if someone changes
MEM_CGROUP_ID_SHIFT in the future, then MEM_CGROUP_ID_MAX will not updated
accordingly.
For this patch, LGTM.
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Thanks.
next prev parent reply other threads:[~2023-07-07 1:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-06 11:28 Miaohe Lin
2023-07-07 1:47 ` Muchun Song [this message]
2023-07-07 2:06 ` Miaohe Lin
2023-07-07 2:25 ` Muchun Song
2023-07-07 2:38 ` Miaohe Lin
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