linux-kernel - Re: [PATCH RFC 06/12] mm/gup: Drop folio_fast_pin

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Message-ID: <ZWDKV0XNjplc_vUP@x1n>
Date:   Fri, 24 Nov 2023 11:07:51 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Ryan Roberts <ryan.roberts@....com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrea Arcangeli <aarcange@...hat.com>,
        James Houghton <jthoughton@...gle.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        John Hubbard <jhubbard@...dia.com>,
        Yang Shi <shy828301@...il.com>,
        Rik van Riel <riel@...riel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linuxppc-dev@...ts.ozlabs.org, Mike Rapoport <rppt@...nel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH RFC 06/12] mm/gup: Drop folio_fast_pin_allowed() in
 hugepd processing

On Fri, Nov 24, 2023 at 09:06:01AM +0000, Ryan Roberts wrote:
> I don't have any micro-benchmarks for GUP though, if that's your question. Is
> there an easy-to-use test I can run to get some numbers? I'd be happy to try it out.

Thanks Ryan.  Then nothing is needed to be tested if gup is not yet touched
from your side, afaict.  I'll see whether I can provide some rough numbers
instead in the next post (I'll probably only be able to test it in a VM,
though, but hopefully that should still reflect mostly the truth).

-- 
Peter Xu