linux-kernel - Re: [PATCH v4 3/4] mm: Optimize mprotect() by PTE-batching

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Message-ID: <1d1312e8-325f-404c-9ea4-03b38ed7b1e1@arm.com>
Date: Wed, 2 Jul 2025 20:33:39 +0530
From: Dev Jain <dev.jain@....com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Ryan Roberts <ryan.roberts@....com>
Cc: akpm@...ux-foundation.org, david@...hat.com, willy@...radead.org,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, catalin.marinas@....com,
 will@...nel.org, Liam.Howlett@...cle.com, vbabka@...e.cz, jannh@...gle.com,
 anshuman.khandual@....com, peterx@...hat.com, joey.gouly@....com,
 ioworker0@...il.com, baohua@...nel.org, kevin.brodsky@....com,
 quic_zhenhuah@...cinc.com, christophe.leroy@...roup.eu,
 yangyicong@...ilicon.com, linux-arm-kernel@...ts.infradead.org,
 hughd@...gle.com, yang@...amperecomputing.com, ziy@...dia.com
Subject: Re: [PATCH v4 3/4] mm: Optimize mprotect() by PTE-batching


On 02/07/25 4:02 pm, Lorenzo Stoakes wrote:
> On Tue, Jul 01, 2025 at 02:40:14PM +0100, Lorenzo Stoakes wrote:
>> Let me fiddle with this code and see if I can suggest something sensible.
> OK this is _even more fiddly_ than I thought.
>
> Dev - feel free to do a respin (once David's stuff's landed in mm-new, which I
> think maybe it has now?), and we can maybe discuss a v6 with everything else in
> place if this is still problematic.
>
> Ryan mentioned an iterator solution, which actually now seems sensible here, if
> fiddly. Please do try to attack that in v5 to see if something's workable there.
>
> Why are computers so complicated...

Sure! I'll be out next week so the mm list can take a breather from my patches : )
My brain exploded trying to understand your and Ryan's implementation conversation,
will read it all and try to come up with something nice.