linux-kernel - Re: [PATCH v4 13/13] x86/folio_zero

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Message-ID: <aFAxEdZCW_uQpfqN@casper.infradead.org>
Date: Mon, 16 Jun 2025 15:58:25 +0100
From: Matthew Wilcox <willy@...radead.org>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Ankur Arora <ankur.a.arora@...cle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, x86@...nel.org, akpm@...ux-foundation.org,
	bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
	mingo@...hat.com, mjguzik@...il.com, luto@...nel.org,
	peterz@...radead.org, acme@...nel.org, namhyung@...nel.org,
	tglx@...utronix.de, jon.grimm@....com, bharata@....com,
	raghavendra.kt@....com, boris.ostrovsky@...cle.com,
	konrad.wilk@...cle.com
Subject: Re: [PATCH v4 13/13] x86/folio_zero_user: Add multi-page clearing

On Mon, Jun 16, 2025 at 07:44:13AM -0700, Dave Hansen wrote:
> To me multi-page means "more than one 'struct page'". But this series is
> clearly using multi-page clearing to mean clearing >PAGE_SIZE in one
> clear. But oh well.

I'm not sure I see the distinction you're trying to draw.  struct page
refers to a PAGE_SIZE aligned, PAGE_SIZE sized chunk of memory.  So
if you do something to more than PAGE_SIZE bytes, you're doing something
to multiple struct pages.