linux-kernel - Re: [PATCH v2 00/19] mm: Support huge pfnmaps

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Message-ID: <20240828142422.GU3773488@nvidia.com>
Date: Wed, 28 Aug 2024 11:24:22 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Jiaqi Yan <jiaqiyan@...gle.com>
Cc: Peter Xu <peterx@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Gavin Shan <gshan@...hat.com>,
	Catalin Marinas <catalin.marinas@....com>, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alistair Popple <apopple@...dia.com>, kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Sean Christopherson <seanjc@...gle.com>,
	Oscar Salvador <osalvador@...e.de>, Borislav Petkov <bp@...en8.de>,
	Zi Yan <ziy@...dia.com>, Axel Rasmussen <axelrasmussen@...gle.com>,
	David Hildenbrand <david@...hat.com>,
	Yan Zhao <yan.y.zhao@...el.com>, Will Deacon <will@...nel.org>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH v2 00/19] mm: Support huge pfnmaps

On Tue, Aug 27, 2024 at 05:42:21PM -0700, Jiaqi Yan wrote:

> Instead of removing the whole pud, can driver or memory_failure do
> something similar to non-struct-page-version of split_huge_page? So
> driver doesn't need to re-fault good pages back?

It would be far nicer if we didn't have to poke a hole in a 1G mapping
just for memory failure reporting.

Jason