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Date: Fri, 18 Mar 2022 20:48:50 -0300 From: Jason Gunthorpe <jgg@...dia.com> To: David Hildenbrand <david@...hat.com> Cc: linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Hugh Dickins <hughd@...gle.com>, Linus Torvalds <torvalds@...ux-foundation.org>, David Rientjes <rientjes@...gle.com>, Shakeel Butt <shakeelb@...gle.com>, John Hubbard <jhubbard@...dia.com>, Mike Kravetz <mike.kravetz@...cle.com>, Mike Rapoport <rppt@...ux.ibm.com>, Yang Shi <shy828301@...il.com>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Matthew Wilcox <willy@...radead.org>, Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>, Michal Hocko <mhocko@...nel.org>, Nadav Amit <namit@...are.com>, Rik van Riel <riel@...riel.com>, Roman Gushchin <guro@...com>, Andrea Arcangeli <aarcange@...hat.com>, Peter Xu <peterx@...hat.com>, Donald Dutile <ddutile@...hat.com>, Christoph Hellwig <hch@....de>, Oleg Nesterov <oleg@...hat.com>, Jan Kara <jack@...e.cz>, Liang Zhang <zhangliang5@...wei.com>, Pedro Gomes <pedrodemargomes@...il.com>, Oded Gabbay <oded.gabbay@...il.com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev <agordeev@...ux.ibm.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, linux-mm@...ck.org, x86@...nel.org, linux-arm-kernel@...ts.infradead.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org Subject: Re: [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages On Tue, Mar 15, 2022 at 03:18:30PM +0100, David Hildenbrand wrote: > This is just the natural follow-up of part 2, that will also further > reduce "wrong COW" on the swapin path, for example, when we cannot remove > a page from the swapcache due to concurrent writeback, or if we have two > threads faulting on the same swapped-out page. Fixing O_DIRECT is just a > nice side-product :) I know I would benefit alot from a description of the swap specific issue a bit more. Most of this message talks about clear_refs which I do understand a bit better. Is this talking about what happens after a page gets swapped back in? eg the exclusive bit is missing when the page is recreated? Otherwise nothing stood out to me here, but I know almost nothing about swap. Thanks, Jason
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