linux-kernel - Re: [GIT PULL] Memory folios for v5.15

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Date:   Tue, 5 Oct 2021 16:56:02 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Johannes Weiner <hannes@...xchg.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] Memory folios for v5.15

On Tue, Oct 05, 2021 at 07:30:06PM +0100, Matthew Wilcox wrote:

> Outside of core MM developers, I'm not sure that a lot of people
> know that a struct page might represent 2^n pages of memory.  Even
> architecture maintainers seem to be pretty fuzzy on what
> flush_dcache_page() does for compound pages:
> https://lore.kernel.org/linux-arch/20200818150736.GQ17456@casper.infradead.org/

I definitely second that opinion

A final outcome where we still have struct page refering to all kinds
of different things feels like a missed opportunity to me.

Jason