linux-kernel - Re: [PATCH v3 1/2] kho: add support for preserving vmalloc allocations

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Message-ID: <20250916130516.GB1086830@nvidia.com>
Date: Tue, 16 Sep 2025 10:05:16 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: Pratyush Yadav <me@...avpratyush.com>,
	Pratyush Yadav <pratyush@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Graf <graf@...zon.com>, Baoquan He <bhe@...hat.com>,
	Changyuan Lyu <changyuanl@...gle.com>, Chris Li <chrisl@...nel.org>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	kexec@...ts.infradead.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] kho: add support for preserving vmalloc
 allocations

On Mon, Sep 15, 2025 at 07:36:25PM +0300, Mike Rapoport wrote:
> > Under the covers it all uses the generic folio based code we already
> > have, but we should have appropriate wrappers around that code that
> > make clear these patterns.
> 
> Right, but that does not mean that vmalloc preserve/restore should use the
> public KHO APIs and avoid using internal methods.

I think it does, the same way vmalloc is layered on top of the buddy
allocator. Why wouldn't you build things in clean understandable
layers like this?

Jason