linux-kernel - Re: [PATCH v4 36/36] mm: Align THP mappings for non-DAX

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Message-ID: <20200526222047.GJ17206@bombadil.infradead.org>
Date:   Tue, 26 May 2020 15:20:47 -0700
From:   Matthew Wilcox <willy@...radead.org>
To:     William Kucharski <william.kucharski@...cle.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 36/36] mm: Align THP mappings for non-DAX

On Tue, May 26, 2020 at 04:05:58PM -0600, William Kucharski wrote:
> Thinking about this, if the intent is to make THP usable for any
> greater than PAGESIZE page size, this routine should probably go back
> to taking a size or perhaps order parameter so it could be called to
> align addresses accordingly rather than hard code PMD_SIZE.

Yes, that's a good point.  For example, on ARM, we'd want to 64kB-align
files which we could use 64kB pages, but there would be no point doing
that on x86.  I'll revert to the earlier version of this patch that
you sent.  Not sure how best to allow the architecture to tell us what
page sizes are useful to align to, but that earlier patch is a better
base to build on than this version.