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From: "Li Zhe" <lizhe.67@bytedance.com>
To: "Peter Zijlstra" <peterz@infradead.org>, <bharata@amd.com>
Cc: <akpm@linux-foundation.org>, <bsegall@google.com>,
	<david@kernel.org>,  <dietmar.eggemann@arm.com>,
	<gourry@gourry.net>,  <joshua.hahnjy@gmail.com>,
	<juri.lelli@redhat.com>,  <kprateek.nayak@amd.com>,
	<ljs@kernel.org>, <mgorman@suse.de>,  <mingo@redhat.com>,
	<riel@redhat.com>, <rostedt@goodmis.org>,
	 <vincent.guittot@linaro.org>, <vschneid@redhat.com>,
	<ziy@nvidia.com>,  <linux-doc@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,  <linux-mm@kvack.org>
Subject: Re: [PATCH v2 0/3] sched/numa: refine memory tiering promotion heuristics
Date: Thu, 29 Oct 2026 10:49:03 +0800	[thread overview]
Message-ID: <b32b2bec-4fa1-4899-9014-52a6568cbd73@bytedance.com> (raw)
In-Reply-To: <20261028092004.GG2668804@noisy.programming.kicks-ass.net>

On 10/28/26 5:20 PM, Peter Zijlstra wrote:
> On Wed, Oct 28, 2026 at 12:12:50PM +0800, Li Zhe wrote:
>> This version narrows the series to memory tiering.  The generic normal
>> NUMA balancing cleanups and heuristic changes from v1 are not included.
> Should we not look at Bharata's pghot stuff first and untangle this numa
> balancing vs tiering nonsense, before making an even bigger mess of
> things?
I agree that pghot is relevant to the longer-term direction.  My
understanding is that the two ideas are not conflicting with each other:
this series tries to refine the current NUMA-balancing-based tiering
implementation, while pghot would be a larger rework of the promotion
infrastructure.

Let's also copy Bharata here so he is aware of this discussion.

Based on Joshua's comment, I can also split patch 2 out as a standalone
fix with a proper Fixes tag, and keep patches 1 and 3 for the broader
tiering heuristic discussion.

Thanks,
Zhe

      reply	other threads:[~2026-10-29  2:49 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-28  4:12 Li Zhe
2026-10-28  4:12 ` [PATCH v2 1/3] sched/numa: make free-space tiering promotion bypass configurable Li Zhe
2026-10-29  4:16   ` Bharata B Rao
2026-10-29  6:24     ` Li Zhe
2026-10-29  9:34   ` Bharata B Rao
2026-10-29  9:46     ` Li Zhe
2026-10-29 10:22       ` Bharata B Rao
2026-10-29 11:33         ` Li Zhe
2026-10-28  4:12 ` [PATCH v2 2/3] sched/numa: do not feed tiering promotions into task placement stats Li Zhe
2026-10-28 15:03   ` Joshua Hahn
2026-10-29  2:52     ` Li Zhe
2026-10-29  5:51     ` Bharata B Rao
2026-10-29  6:29       ` Li Zhe
2026-10-28  4:12 ` [PATCH v2 3/3] sched/numa: fix scan-period adjustment for tiering-only mode Li Zhe
2026-10-29  6:21   ` Bharata B Rao
2026-10-29  8:16     ` Li Zhe
2026-10-28  9:20 ` [PATCH v2 0/3] sched/numa: refine memory tiering promotion heuristics Peter Zijlstra
2026-10-29  2:49   ` Li Zhe [this message]

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