From: David Hildenbrand <david@redhat.com>
To: Bharata B Rao <bharata@amd.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Cc: Jonathan.Cameron@huawei.com, dave.hansen@intel.com,
gourry@gourry.net, hannes@cmpxchg.org,
mgorman@techsingularity.net, mingo@redhat.com,
peterz@infradead.org, raghavendra.kt@amd.com, riel@surriel.com,
rientjes@google.com, sj@kernel.org, weixugc@google.com,
willy@infradead.org, ying.huang@linux.alibaba.com,
ziy@nvidia.com, dave@stgolabs.net, nifan.cxl@gmail.com,
joshua.hahnjy@gmail.com, xuezhengchu@huawei.com,
yiannis@zptcorp.com, akpm@linux-foundation.org
Subject: Re: [RFC PATCH v0 2/2] mm: sched: Batch-migrate misplaced pages
Date: Thu, 22 May 2025 18:11:13 +0200 [thread overview]
Message-ID: <62cef618-123c-4ffa-b45a-c38b65d2a5a3@redhat.com> (raw)
In-Reply-To: <20250521080238.209678-3-bharata@amd.com>
On 21.05.25 10:02, Bharata B Rao wrote:
> Currently the folios identified as misplaced by the NUMA
> balancing sub-system are migrated one by one from the NUMA
> hint fault handler as and when they are identified as
> misplaced.
>
> Instead of such singe folio migrations, batch them and
> migrate them at once.
>
> Identified misplaced folios are isolated and stored in
> a per-task list. A new task_work is queued from task tick
> handler to migrate them in batches. Migration is done
> periodically or if pending number of isolated foios exceeds
> a threshold.
That means that these pages are effectively unmovable for other purposes
(CMA, compaction, long-term pinning, whatever) until that list was drained.
Bad.
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-05-22 16:11 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-21 8:02 [RFC PATCH v0 0/2] Batch migration for NUMA balancing Bharata B Rao
2025-05-21 8:02 ` [RFC PATCH v0 1/2] migrate: implement migrate_misplaced_folio_batch Bharata B Rao
2025-05-22 15:59 ` David Hildenbrand
2025-05-22 16:03 ` Gregory Price
2025-05-22 16:08 ` David Hildenbrand
2025-05-26 8:16 ` Huang, Ying
2025-05-21 8:02 ` [RFC PATCH v0 2/2] mm: sched: Batch-migrate misplaced pages Bharata B Rao
2025-05-21 18:25 ` Donet Tom
2025-05-21 18:40 ` Zi Yan
2025-05-22 3:24 ` Gregory Price
2025-05-22 5:23 ` Bharata B Rao
2025-05-22 4:42 ` Bharata B Rao
2025-05-22 4:39 ` Bharata B Rao
2025-05-23 9:05 ` Donet Tom
2025-05-22 3:55 ` Gregory Price
2025-05-22 7:33 ` Bharata B Rao
2025-05-22 15:38 ` Gregory Price
2025-05-22 16:11 ` David Hildenbrand [this message]
2025-05-22 16:24 ` Zi Yan
2025-05-22 16:26 ` David Hildenbrand
2025-05-22 16:38 ` Zi Yan
2025-05-22 17:21 ` David Hildenbrand
2025-05-22 17:30 ` Zi Yan
2025-05-26 8:33 ` Huang, Ying
2025-05-26 9:29 ` David Hildenbrand
2025-05-26 14:20 ` Zi Yan
2025-05-27 1:18 ` Huang, Ying
2025-05-27 1:27 ` Zi Yan
2025-05-28 12:25 ` Karim Manaouil
2025-05-26 5:14 ` Bharata B Rao
2025-05-21 18:45 ` [RFC PATCH v0 0/2] Batch migration for NUMA balancing SeongJae Park
2025-05-22 3:08 ` Gregory Price
2025-05-22 16:30 ` SeongJae Park
2025-05-22 17:40 ` Gregory Price
2025-05-22 18:52 ` SeongJae Park
2025-05-22 18:43 ` Apologies and clarifications on DAMON-disruptions (was Re: [RFC PATCH v0 0/2] Batch migration for NUMA balancing) SeongJae Park
2025-05-26 5:20 ` [RFC PATCH v0 0/2] Batch migration for NUMA balancing Bharata B Rao
2025-05-27 18:50 ` SeongJae Park
2025-05-26 8:46 ` Huang, Ying
2025-05-27 8:53 ` Bharata B Rao
2025-05-27 9:05 ` Huang, Ying
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