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,
liam@infradead.org, vbabka@kernel.org, rppt@kernel.org,
surenb@google.com, mhocko@suse.com, mingo@redhat.com,
peterz@infradead.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
vschneid@redhat.com, kprateek.nayak@amd.com, ziy@nvidia.com,
baolin.wang@linux.alibaba.com, nico.pache@linux.dev,
ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org,
lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org,
matthew.brost@intel.com, joshua.hahnjy@gmail.com,
rakie.kim@sk.com, byungchul@sk.com,
ying.huang@linux.alibaba.com, apopple@nvidia.com,
jannh@google.com, pfalcato@suse.de, osalvador@suse.de,
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
next prev parent reply other threads:[~2026-09-11 5:38 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-11 0:18 [PATCH v2 0/4] sched/numa: stop VMA scan filters from gating promotion Gregory Price
2026-09-11 0:18 ` [PATCH v2 1/4] mm: support promotion-only NUMA hinting scans Gregory Price
2026-09-17 16:03 ` Peter Zijlstra
2026-09-17 16:14 ` Gregory Price
2026-09-18 12:26 ` David Hildenbrand (Arm)
2026-09-18 12:37 ` David Hildenbrand (Arm)
2026-09-18 13:46 ` Gregory Price
2026-09-18 13:56 ` David Hildenbrand (Arm)
2026-09-11 0:18 ` [PATCH v2 2/4] mm: allow shared folios to be promoted to a fast tier Gregory Price
2026-09-17 16:08 ` Peter Zijlstra
2026-09-17 16:18 ` Gregory Price
2026-09-17 16:23 ` Peter Zijlstra
2026-09-17 16:39 ` Gregory Price
2026-09-18 4:14 ` Bharata B Rao
2026-09-17 17:49 ` Zi Yan
2026-09-18 12:54 ` David Hildenbrand (Arm)
2026-09-18 12:53 ` David Hildenbrand (Arm)
2026-09-18 13:54 ` Gregory Price
2026-09-18 13:57 ` David Hildenbrand (Arm)
2026-09-11 0:18 ` [PATCH v2 3/4] sched/numa: scan read-only file mappings in tiering mode Gregory Price
2026-09-18 12:58 ` David Hildenbrand (Arm)
2026-09-18 13:57 ` Gregory Price
2026-09-18 13:59 ` David Hildenbrand (Arm)
2026-09-18 14:53 ` Lorenzo Stoakes (ARM)
2026-09-18 15:48 ` Gregory Price
2026-09-18 16:19 ` Lorenzo Stoakes (ARM)
2026-09-18 16:38 ` Gregory Price
2026-09-11 0:18 ` [PATCH v2 4/4] sched/numa: do not let VMA PID activity gate promotion Gregory Price
2026-09-17 16:19 ` Peter Zijlstra
2026-09-18 13:01 ` David Hildenbrand (Arm)
2026-09-18 13:59 ` Gregory Price
2026-09-11 5:38 ` Gregory Price [this message]
2026-09-17 5:35 ` [PATCH v2 0/4] sched/numa: stop VMA scan filters from gating promotion Andrew Morton
2026-09-17 6:59 ` Gregory Price
2026-09-17 15:53 ` David Hildenbrand (Arm)
2026-09-18 20:56 ` Zi Yan
2026-09-18 21:42 ` Gregory Price
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aqOR7TY5YtIadMAK@gourry-fedora-PF4VCD3F \
--to=gourry@gourry.net \
--cc=akpm@linux-foundation.org \
--cc=apopple@nvidia.com \
--cc=baohua@kernel.org \
--cc=baolin.wang@linux.alibaba.com \
--cc=bsegall@google.com \
--cc=byungchul@sk.com \
--cc=david@kernel.org \
--cc=dev.jain@arm.com \
--cc=dietmar.eggemann@arm.com \
--cc=hannes@cmpxchg.org \
--cc=jannh@google.com \
--cc=joshua.hahnjy@gmail.com \
--cc=juri.lelli@redhat.com \
--cc=kas@kernel.org \
--cc=kernel-team@meta.com \
--cc=kprateek.nayak@amd.com \
--cc=lance.yang@linux.dev \
--cc=liam@infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=ljs@kernel.org \
--cc=matthew.brost@intel.com \
--cc=mgorman@suse.de \
--cc=mhocko@suse.com \
--cc=mingo@redhat.com \
--cc=nico.pache@linux.dev \
--cc=osalvador@suse.de \
--cc=peterz@infradead.org \
--cc=pfalcato@suse.de \
--cc=raghavendra.kt@amd.com \
--cc=rakie.kim@sk.com \
--cc=rostedt@goodmis.org \
--cc=rppt@kernel.org \
--cc=ryan.roberts@arm.com \
--cc=surenb@google.com \
--cc=usama.arif@linux.dev \
--cc=vbabka@kernel.org \
--cc=vincent.guittot@linaro.org \
--cc=vschneid@redhat.com \
--cc=ying.huang@linux.alibaba.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.