linux-kernel - Re: [PATCH v6] arm64/mm: Optimize loop to reduce redundant operations of contpte_ptep

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Message-ID: <bced1b03-1a74-48f9-a4c9-c7feaf9786df@arm.com>
Date: Wed, 4 Jun 2025 13:54:49 +0100
From: Ryan Roberts <ryan.roberts@....com>
To: Andrew Morton <akpm@...ux-foundation.org>, Xavier <xavier_qy@....com>
Cc: will@...nel.org, 21cnbao@...il.com, dev.jain@....com,
 ioworker0@...il.com, catalin.marinas@....com, david@...hat.com,
 gshan@...hat.com, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, willy@...radead.org, ziy@...dia.com,
 Barry Song <baohua@...nel.org>
Subject: Re: [PATCH v6] arm64/mm: Optimize loop to reduce redundant operations
 of contpte_ptep_get

On 04/06/2025 03:31, Andrew Morton wrote:
> On Tue, 3 Jun 2025 16:00:11 +0800 (CST) Xavier  <xavier_qy@....com> wrote:
> 
>> It has been three weeks since the submission of Patch v6. I take the liberty of
>> asking whether you still have any comments or suggestions on this version,
>> and whether the test data indicates that it is ready for merging. I sincerely
>> look forward to your valuable feedback and guidance.
> 
> It was late in the 6.15-rcX cycle and I was hoping that arm people
> would handle this.
> 
> It would be better if the patches had cc:linux-mm@...ck.org.
> 
> I'll grab it and shall include it in -next after -rc1.  If ARM people
> want to grab it, please do so and I'll autodrop the mm.git copy.
> 

Appologies for radio silence; As Catalin and I both said before, the arm email
servers drop all mail from Xavier <xavier_qy@....com> on the floor. I'm not sure
why, but any chance you could use a different email account to make this smoother?

I'm doing some testing of this now and will respond properly in the next few
days. But I don't personally like the complexity of the patch and am not totally
clear on if this is likely to show a real benefit in real-world use cases (as I
commented previously).

I'll respond properly once I have some results.

Given this is only touching arm64, I'd really prefer that this go via arm64 if
at all.

Thanks,
Ryan