From: Balbir Singh <balbirs@nvidia.com>
To: Matthew Wilcox <willy@infradead.org>, Bharata B Rao <bharata@amd.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Jonathan.Cameron@huawei.com, dave.hansen@intel.com,
gourry@gourry.net, 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,
ying.huang@linux.alibaba.com, ziy@nvidia.com, dave@stgolabs.net,
nifan.cxl@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com,
akpm@linux-foundation.org, david@kernel.org, byungchul@sk.com,
kinseyho@google.com, joshua.hahnjy@gmail.com, yuanchu@google.com,
alok.rathore@samsung.com, shivankg@amd.com,
donettom@linux.ibm.com
Subject: Re: [PATCH v7 0/7] mm: Hot page tracking and promotion infrastructure
Date: Wed, 6 May 2026 08:17:42 +1000 [thread overview]
Message-ID: <e5246723-b910-418c-bed8-5222d63d90da@nvidia.com> (raw)
In-Reply-To: <afkDNR9yVRjire4T@casper.infradead.org>
On 5/5/26 06:36, Matthew Wilcox wrote:
> On Mon, May 04, 2026 at 11:39:17AM +0530, Bharata B Rao wrote:
>> This is v7 of pghot, a hot-page tracking and promotion subsystem. The
>
> I continue to think we should not do this.
>
I am unclear about the benefits of the patchset, I have not tested
it or reviewed the latest revision. My big concern was that top-tier
might not always be suitable.
I see that there are some numbers posted, but I find this weird
"After the graph creation, the processes are stopped and data is migrated
to CXL node 2 before continuing so that BFS phase starts accessing lower
tier memory." Why not allocate everything on CXL node 2?
Balbir
next prev parent reply other threads:[~2026-05-05 22:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-04 6:09 [PATCH v7 0/7] mm: Hot page tracking and promotion infrastructure Bharata B Rao
2026-05-04 6:09 ` [PATCH v7 1/7] mm: migrate: Allow misplaced migration without VMA Bharata B Rao
2026-05-04 6:09 ` [PATCH v7 2/7] mm: migrate: Add promote_misplaced_memcg_folios() Bharata B Rao
2026-05-04 18:14 ` Donet Tom
2026-05-06 6:15 ` Bharata B Rao
2026-05-04 6:09 ` [PATCH v7 3/7] mm: Hot page tracking and promotion - pghot Bharata B Rao
2026-05-04 6:09 ` [PATCH v7 4/7] mm: pghot: Precision mode for pghot Bharata B Rao
2026-05-04 18:41 ` Donet Tom
2026-05-06 6:17 ` Bharata B Rao
2026-05-04 6:09 ` [PATCH v7 5/7] mm: sched: move NUMA balancing tiering promotion to pghot Bharata B Rao
2026-05-05 4:44 ` Donet Tom
2026-05-06 6:20 ` Bharata B Rao
2026-05-04 6:09 ` [RFC PATCH v7 6/7] x86/ibs: Move IBS caps definitions into its own header Bharata B Rao
2026-05-04 6:09 ` [RFC PATCH v7 7/7] x86/mm/ibs: In-kernel driver for AMD IBS Memory Profiler Bharata B Rao
2026-05-04 6:23 ` [PATCH v7 0/7] mm: Hot page tracking and promotion infrastructure Bharata B Rao
2026-05-04 20:36 ` Matthew Wilcox
2026-05-05 22:17 ` Balbir Singh [this message]
2026-05-06 3:43 ` Bharata B Rao
2026-05-06 4:02 ` Balbir Singh
2026-05-06 5:00 ` Bharata B Rao
2026-05-05 10:41 ` Bharata B Rao
2026-05-05 13:42 ` Bharata B Rao
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