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From: Tejun Heo <tj@kernel.org>
To: Li Zhe <lizhe.67@bytedance.com>
Cc: hannes@cmpxchg.org, mkoutny@suse.com, akpm@linux-foundation.org,
	david@kernel.org, gourry@gourry.net, ziy@nvidia.com,
	joshua.hahnjy@gmail.com, ying.huang@linux.alibaba.com,
	ljs@kernel.org, liam@infradead.org, rppt@kernel.org,
	surenb@google.com, mhocko@suse.com, cgroups@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	bpf@vger.kernel.org
Subject: Re: [PATCH 0/3] mm/mempolicy: add per-cgroup weighted interleave controls
Date: Tue, 03 Nov 2026 05:35:45 -1000	[thread overview]
Message-ID: <0efbf4db1decd8e6bb6a5fcdcf897314@kernel.org> (raw)
In-Reply-To: <20261103122816.48037-1-lizhe.67@bytedance.com>

Hello, Zhe.

On Tue, Nov 03, 2026 at 08:28:13PM +0800, Li Zhe wrote:
> MPOL_WEIGHTED_INTERLEAVE currently has one system-wide weight table,
> configured through sysfs or auto-derived from node bandwidth. This series
> adds an optional BPF control plane that lets privileged BPF syscall
> programs install manual weighted-interleave overrides for individual
> cgroups.
...

I don't think this has much to do with cgroups. Weighted interleave is
already a per-thread/per-VMA policy chosen through set_mempolicy() and
mbind(), and the weights are parameters of that policy. I think this
should be tied to the memory policy instead. This is different from
the per-cgroup NUMA balancing kfuncs. NUMA balancing has no per-task
opt-in and acts on memory with no task context.

Gregory Price's mempolicy2 series already proposed set_mempolicy2() and
mbind2() with task-local weights:

  https://lore.kernel.org/all/20240103224209.2541-1-gregory.price@memverge.com/

Thanks.

--
tejun

      parent reply	other threads:[~2026-11-03 15:35 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-03 12:28 Li Zhe
2026-11-03 12:28 ` [PATCH 1/3] mm/mempolicy: factor weighted interleave state helpers Li Zhe
2026-11-03 12:28 ` [PATCH 2/3] mm/mempolicy: add cgroup weighted interleave plumbing Li Zhe
2026-11-03 12:28 ` [PATCH 3/3] mm/mempolicy: add BPF kfuncs for cgroup interleave weights Li Zhe
2026-11-03 15:35 ` Tejun Heo [this message]

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