From: Gregory Price <gourry@gourry.net>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com,
akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org,
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hannes@cmpxchg.org, raghavendra.kt@amd.com
Subject: Re: [PATCH v2 0/4] sched/numa: stop VMA scan filters from gating promotion
Date: Fri, 11 Sep 2026 01:38:10 -0400 [thread overview]
Message-ID: <aqOR7TY5YtIadMAK@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <20260911001826.2109390-1-gourry@gourry.net>
On Thu, Sep 10, 2026 at 08:18:22PM -0400, Gregory Price wrote:
> NUMA balancing uses hinting faults for both task placement and memory-tier
> promotion. Several filters designed to avoid unproductive socket-placement
> faults can also prevent promotion.
>
sashiko notes - remaining notes appear to be false positives.
patch 2: "... bounce horizontally between slow tiers" <- nonsense
patch 3 and 4: it's existing code extracted into a helper, using the
same checks we're already using. If we want it updated,
that can come in a separate patch.
note: this work has some backport conflicts, but tiered numa balancing
has effectively been broken multiple times since 2022 and 2023 due to
these filtering mechanisms.
~Gregory
prev parent reply other threads:[~2026-09-11 5:38 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 0:18 Gregory Price
2026-09-11 0:18 ` [PATCH v2 1/4] mm: support promotion-only NUMA hinting scans Gregory Price
2026-09-11 0:18 ` [PATCH v2 2/4] mm: allow shared folios to be promoted to a fast tier Gregory Price
2026-09-11 0:18 ` [PATCH v2 3/4] sched/numa: scan read-only file mappings in tiering mode Gregory Price
2026-09-11 0:18 ` [PATCH v2 4/4] sched/numa: do not let VMA PID activity gate promotion Gregory Price
2026-09-11 5:38 ` Gregory Price [this message]
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