linux-kernel - Re: [RESEND PATCH v7 00/10] Small-sized THP for anonymous memory

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Date:   Thu, 23 Nov 2023 15:59:39 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Ryan Roberts <ryan.roberts@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Yin Fengwei <fengwei.yin@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Yu Zhao <yuzhao@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Yang Shi <shy828301@...il.com>,
        "Huang, Ying" <ying.huang@...el.com>, Zi Yan <ziy@...dia.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Itaru Kitayama <itaru.kitayama@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Hugh Dickins <hughd@...gle.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v7 00/10] Small-sized THP for anonymous memory

On Wed, Nov 22, 2023 at 04:29:40PM +0000, Ryan Roberts wrote:
> Note: I'm resending this at Andrew's suggestion due to having originally sent
> it during LPC. I'm hoping its in a position where the feedback is minor enough
> that I can rework in time for v6.8, but so far haven't had any.
> 
> Hi All,
> 
> This is v7 of a series to implement small-sized THP for anonymous memory
> (previously called "large anonymous folios"). The objective of this is to

I'm still against small-sized THP.  We've now got people asking whether
the THP counters should be updated when dealing with large folios that
are smaller than PMD sized.  It's sowing confusion, and we should go
back to large anon folios as a name.