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From: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
To: Seunghyun An <san55@wisc.edu>
Cc: "linux-mm@kvack.org" <linux-mm@kvack.org>,
	 Andrew Morton <akpm@linux-foundation.org>,
	David Hildenbrand <david@kernel.org>,
	 Vlastimil Babka <vbabka@kernel.org>,
	"Liam R . Howlett" <liam@infradead.org>,
	 Jann Horn <jannh@google.com>, Pedro Falcato <pfalcato@suse.de>,
	 Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
	 Dave Hansen <dave.hansen@linux.intel.com>,
	Suren Baghdasaryan <surenb@google.com>,
	 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH 0/2] mm: avoid redundant reads of the vm_refcnt cacheline in anonymous faults
Date: Tue, 10 Nov 2026 14:52:43 +0000	[thread overview]
Message-ID: <avMvlLOaByIc7SWj@gremlin> (raw)
In-Reply-To: <MN2PR06MB66398F39E876279DA2CA8A52D2722@MN2PR06MB6639.namprd06.prod.outlook.com>

On Tue, Nov 10, 2026 at 02:34:31PM +0000, Seunghyun An wrote:
> Thanks for taking this on.
>
> I should have disclosed the LLM involvement up front, and I'm sorry
> I didn't. I came across this while researching the performance of the
> anonymous fault path and worked with Claude to investigate and quantify
> it. Claude also drafted the code and changelogs.
>
> My main aim was to report the findings to the community. In hindsight,
> a plain report would have been a better way to raise it. I wanted to share
> the measured effects, especially on EPYC given the higher cross-CCD
> coherency penalty, and offer a possible way to address them.
>
> I'd be glad to collaborate on measurements for your series and any
> follow-up work in this area.

Thanks! I will cc- you on the patch, and if there is any remaining issue we can
chase that down.

And of course credit you on the patch as reporter! :)

--
Cheers, Lorenzo

      reply	other threads:[~2026-11-10 14:52 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-10  0:00 Seunghyun An
2026-11-10  0:00 ` [PATCH 1/2] mm/rmap: use vm_pgoff for anonymous VMAs in linear_anon_page_index() Seunghyun An
2026-11-10 11:25   ` Pedro Falcato
2026-11-10 12:59     ` Lorenzo Stoakes (ARM)
2026-11-10  0:00 ` [PATCH 2/2] mm/vma: only assert VMA stability in vma_has_anon_rmap() with CONFIG_DEBUG_VM Seunghyun An
2026-11-10 11:03 ` [PATCH 0/2] mm: avoid redundant reads of the vm_refcnt cacheline in anonymous faults Lorenzo Stoakes (ARM)
2026-11-10 14:34   ` Seunghyun An
2026-11-10 14:52     ` Lorenzo Stoakes (ARM) [this message]

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