linux-kernel - Re: [PATCH 0/5] remove tlb_remove_page

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Message-ID: <Z6cGS__8VRQdzAYA@casper.infradead.org>
Date: Sat, 8 Feb 2025 07:22:51 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Qi Zheng <zhengqi.arch@...edance.com>, kevin.brodsky@....com,
	riel@...riel.com, vishal.moola@...il.com, david@...hat.com,
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Subject: Re: [PATCH 0/5] remove tlb_remove_page_ptdesc()

On Fri, Jan 24, 2025 at 12:47:59PM +0100, Peter Zijlstra wrote:
> Right, so I don't think Sparc and Power care to use ptdesc, they're
> using non page page-tables.

i think you mean s390, not sparc.  all architectures _use_ ptdescs,
it's just that s390  and ppc use fractional ptdescs rather than an
entire ptdesc for an individual page table.

eventually we can change that, but we're looking out perhaps five years
before we can allocate a ptdesc for a sub-PAGE_SIZE quantity.