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Re: [PATCH v5 06/12] mm: introduce generic lazy_mmu helpers
- To: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
- From: Kevin Brodsky <kevin.brodsky@xxxxxxx>
- Date: Wed, 3 Dec 2025 09:20:34 +0100
- Cc: linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Andreas Larsson <andreas@xxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Jann Horn <jannh@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>, Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>, Madhavan Srinivasan <maddy@xxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, "Ritesh Harjani (IBM)" <ritesh.list@xxxxxxxxx>, Ryan Roberts <ryan.roberts@xxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Venkat Rao Bagalkote <venkat88@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Yeoreum Yun <yeoreum.yun@xxxxxxx>, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, x86@xxxxxxxxxx
- Delivery-date: Wed, 03 Dec 2025 08:20:49 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28/11/2025 14:50, Alexander Gordeev wrote:
> Would it make sense to explicitly describe the policy wrt sleeping while
> in lazy MMU mode? If I understand the conclusion of conversation right:
>
> * An arch implementation may disable preemption, but then it is arch
> responsibility not to call any arch-specific code that might sleep;
> * As result, while in lazy MMU mode the generic code should never
> call a code that might sleep;
I think that's a good summary, and I agree that the second point is not
obvious from the comment in <linux/pgtable.h>. This series it not making
any change in that respect, but I'll add a clarification in this patch
(or a separate patch).
- Kevin
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