From: Jason Gunthorpe <jgg@nvidia•com>
To: David Hildenbrand <david@redhat•com>
Cc: x86@kernel•org, Jan Kara <jack@suse•cz>,
Catalin Marinas <catalin.marinas@arm•com>,
Yang Shi <shy828301@gmail•com>,
Dave Hansen <dave.hansen@linux•intel.com>,
Peter Xu <peterx@redhat•com>, Michal Hocko <mhocko@kernel•org>,
linux-mm@kvack•org, Donald Dutile <ddutile@redhat•com>,
Liang Zhang <zhangliang5@huawei•com>,
Borislav Petkov <bp@alien8•de>,
Alexander Gordeev <agordeev@linux•ibm.com>,
Will Deacon <will@kernel•org>, Christoph Hellwig <hch@lst•de>,
Paul Mackerras <paulus@samba•org>,
Andrea Arcangeli <aarcange@redhat•com>,
linux-s390@vger•kernel.org, Vasily Gorbik <gor@linux•ibm.com>,
Rik van Riel <riel@surriel•com>, Hugh Dickins <hughd@google•com>,
Matthew Wilcox <willy@infradead•org>,
Mike Rapoport <rppt@linux•ibm.com>,
Ingo Molnar <mingo@redhat•com>,
linux-arm-kernel@lists•infradead.org,
David Rientjes <rientjes@google•com>,
Pedro Gomes <pedrodemargomes@gmail•com>,
Jann Horn <jannh@google•com>, John Hubbard <jhubbard@nvidia•com>,
Heiko Carstens <hca@linux•ibm.com>,
Shakeel Butt <shakeelb@google•com>,
Oleg Nesterov <oleg@redhat•com>,
Thomas Gleixner <tglx@linutronix•de>,
Vlastimil Babka <vbabka@suse•cz>,
Oded Gabbay <oded.gabbay@gmail•com>,
linuxppc-dev@lists•ozlabs.org, linux-kernel@vger•kernel.org,
Nadav Amit <namit@vmware•com>,
Andrew Morton <akpm@linux-foundation•org>,
Linus Torvalds <torvalds@linux-foundation•org>,
Roman Gushchin <guro@fb•com>,
"Kirill A . Shutemov" <kirill.shutemov@linux•intel.com>,
Mike Kravetz <mike.kravetz@oracle•com>
Subject: Re: [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages
Date: Fri, 18 Mar 2022 20:48:50 -0300 [thread overview]
Message-ID: <20220318234850.GD11336@nvidia.com> (raw)
In-Reply-To: <20220315141837.137118-1-david@redhat.com>
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
next prev parent reply other threads:[~2022-03-18 23:50 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-15 14:18 [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 1/7] mm/swap: remember PG_anon_exclusive via a swp pte bit David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 2/7] mm/debug_vm_pgtable: add tests for __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 3/7] x86/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 4/7] arm64/pgtable: " David Hildenbrand
2022-03-16 18:27 ` Catalin Marinas
2022-03-17 10:04 ` David Hildenbrand
2022-03-17 17:58 ` Catalin Marinas
2022-03-18 9:59 ` David Hildenbrand
2022-03-18 11:33 ` Catalin Marinas
2022-03-18 14:14 ` David Hildenbrand
2022-03-21 14:38 ` Will Deacon
2022-03-21 14:39 ` Will Deacon
2022-03-21 15:07 ` David Hildenbrand
2022-03-21 17:44 ` Will Deacon
2022-03-21 18:27 ` Catalin Marinas
2022-03-22 9:46 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 5/7] s390/pgtable: " David Hildenbrand
2022-03-15 16:21 ` Gerald Schaefer
2022-03-15 16:37 ` David Hildenbrand
2022-03-15 16:58 ` David Hildenbrand
2022-03-15 17:12 ` David Hildenbrand
2022-03-15 17:14 ` David Hildenbrand
2022-03-16 10:56 ` Gerald Schaefer
2022-03-16 11:06 ` David Hildenbrand
2022-03-16 13:01 ` Christian Borntraeger
2022-03-16 13:27 ` Gerald Schaefer
2022-03-16 14:00 ` David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 6/7] powerpc/pgtable: remove _PAGE_BIT_SWAP_TYPE for book3s David Hildenbrand
2022-03-15 14:18 ` [PATCH v1 7/7] powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE " David Hildenbrand
2022-03-18 23:48 ` Jason Gunthorpe [this message]
2022-03-19 11:17 ` [PATCH v1 0/7] mm: COW fixes part 3: reliable GUP R/W FOLL_GET of anonymous pages David Hildenbrand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220318234850.GD11336@nvidia.com \
--to=jgg@nvidia$(echo .)com \
--cc=aarcange@redhat$(echo .)com \
--cc=agordeev@linux$(echo .)ibm.com \
--cc=akpm@linux-foundation$(echo .)org \
--cc=bp@alien8$(echo .)de \
--cc=catalin.marinas@arm$(echo .)com \
--cc=dave.hansen@linux$(echo .)intel.com \
--cc=david@redhat$(echo .)com \
--cc=ddutile@redhat$(echo .)com \
--cc=gor@linux$(echo .)ibm.com \
--cc=guro@fb$(echo .)com \
--cc=hca@linux$(echo .)ibm.com \
--cc=hch@lst$(echo .)de \
--cc=hughd@google$(echo .)com \
--cc=jack@suse$(echo .)cz \
--cc=jannh@google$(echo .)com \
--cc=jhubbard@nvidia$(echo .)com \
--cc=kirill.shutemov@linux$(echo .)intel.com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linux-mm@kvack$(echo .)org \
--cc=linux-s390@vger$(echo .)kernel.org \
--cc=linuxppc-dev@lists$(echo .)ozlabs.org \
--cc=mhocko@kernel$(echo .)org \
--cc=mike.kravetz@oracle$(echo .)com \
--cc=mingo@redhat$(echo .)com \
--cc=namit@vmware$(echo .)com \
--cc=oded.gabbay@gmail$(echo .)com \
--cc=oleg@redhat$(echo .)com \
--cc=paulus@samba$(echo .)org \
--cc=pedrodemargomes@gmail$(echo .)com \
--cc=peterx@redhat$(echo .)com \
--cc=riel@surriel$(echo .)com \
--cc=rientjes@google$(echo .)com \
--cc=rppt@linux$(echo .)ibm.com \
--cc=shakeelb@google$(echo .)com \
--cc=shy828301@gmail$(echo .)com \
--cc=tglx@linutronix$(echo .)de \
--cc=torvalds@linux-foundation$(echo .)org \
--cc=vbabka@suse$(echo .)cz \
--cc=will@kernel$(echo .)org \
--cc=willy@infradead$(echo .)org \
--cc=x86@kernel$(echo .)org \
--cc=zhangliang5@huawei$(echo .)com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox