From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Andreas Larsson <andreas@gaisler.com>, Imre Kaloz <kaloz@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
"Mike Rapoport (IBM)" <rppt@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <liam@infradead.org>,
Lorenzo Stoakes <ljs@kernel.org>,
Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
Pedro Falcato <pfalcato@suse.de>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Magnus Lindholm <linmag7@gmail.com>
Subject: Re: [PATCH v3 4/4] mm: pass the number of PTEs to move_pte()
Date: Wed, 28 Oct 2026 14:59:11 +0100 [thread overview]
Message-ID: <cc5c7066-b5cd-45df-b338-37944320da2f@kernel.org> (raw)
In-Reply-To: <4fba060e-c4f4-4d73-8efe-dbed0b5a7bc3@gaisler.com>
On 10/28/26 14:57, Andreas Larsson wrote:
> On 2026-10-28 11:17, Imre Kaloz wrote:
>>> The biggest problem all of us with supporting old hardware is the maintanance
>>> cost. Not just core-mm, but also things like ad-hoc page table walkers you are
>>> adding we (from core-mm) might have to touch at some point.
>>>
>>> If there is no good reason for the complexity, out it goes.
>>>
>>> Because otherwise people will push more and more for removing legacy support
>>> completely, and that's not what you want, right?
>>
>> Definitely not. Fair point, I was only looking at it from the sparc
>> side, and keeping these platforms cheap to carry matters more than a
>> few percent on reclaim. B it is, then; it's below the scissors, on top
>> of 1/4-3/4. Thanks for taking the time to go through this!
>>
>> Andreas, if David is happy with it, would you take it in place of 4/4?
> I'm open to a solution like that, but it'll have to wait for the next
> round as we are far too far into the merge window.
Fully agreed.
--
Cheers,
David
next prev parent reply other threads:[~2026-10-28 13:59 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-21 23:33 [PATCH v3 0/4] sparc64: D-cache alias flushing fixes Imre Kaloz
2026-10-21 23:33 ` [PATCH v3 1/4] sparc64: skip the trap block in xcall_deliver() when there is no target Imre Kaloz
2026-10-21 23:33 ` [PATCH v3 2/4] sparc64: flush only the aliased page, not its whole folio Imre Kaloz
2026-10-21 23:33 ` [PATCH v3 3/4] sparc64: flush vmalloc ranges from the D-cache on map and unmap Imre Kaloz
2026-10-21 23:33 ` [PATCH v3 4/4] mm: pass the number of PTEs to move_pte() Imre Kaloz
2026-10-23 17:17 ` Pedro Falcato
2026-10-23 20:53 ` David Hildenbrand (Arm)
2026-10-27 21:26 ` Imre Kaloz
2026-10-28 8:49 ` David Hildenbrand (Arm)
2026-10-28 9:16 ` Imre Kaloz
2026-10-28 9:22 ` David Hildenbrand (Arm)
2026-10-28 9:58 ` John Paul Adrian Glaubitz
2026-10-28 10:02 ` David Hildenbrand (Arm)
2026-10-28 10:12 ` Lorenzo Stoakes (ARM)
2026-10-28 10:17 ` Imre Kaloz
2026-10-28 13:57 ` Andreas Larsson
2026-10-28 13:59 ` David Hildenbrand (Arm) [this message]
2026-10-28 16:26 ` Imre Kaloz
2026-10-28 14:00 ` David Hildenbrand (Arm)
2026-10-22 8:20 ` [PATCH v3 0/4] sparc64: D-cache alias flushing fixes Stian Halseth
2026-10-23 9:22 ` Andreas Larsson
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