From: Peter Xu <peterx@redhat.com>
To: Barry Song <21cnbao@gmail.com>
Cc: david@redhat.com, Liam.Howlett@oracle.com, aarcange@redhat.com,
akpm@linux-foundation.org, axelrasmussen@google.com,
bgeffon@google.com, brauner@kernel.org, hughd@google.com,
jannh@google.com, kaleshsingh@google.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
lokeshgidra@google.com, mhocko@suse.com, ngeoffray@google.com,
rppt@kernel.org, ryan.roberts@arm.com, shuah@kernel.org,
surenb@google.com, v-songbaohua@oppo.com,
viro@zeniv.linux.org.uk, willy@infradead.org,
zhangpeng362@huawei.com, zhengtangquan@oppo.com,
yuzhao@google.com, stable@vger.kernel.org
Subject: Re: [PATCH RFC] mm: Fix kernel BUG when userfaultfd_move encounters swapcache
Date: Thu, 20 Feb 2025 18:32:25 -0500 [thread overview]
Message-ID: <Z7e7iYNvGweeGsRU@x1.local> (raw)
In-Reply-To: <20250220092101.71966-1-21cnbao@gmail.com>
On Thu, Feb 20, 2025 at 10:21:01PM +1300, Barry Song wrote:
> 2. src_anon_vma and its lock – swapcache doesn’t require it（folio is not mapped）
Could you help explain what guarantees the rmap walk not happen on a
swapcache page?
I'm not familiar with this path, though at least I see damon can start a
rmap walk on PageAnon almost with no locking.. some explanations would be
appreciated.
--
Peter Xu
next prev parent reply other threads:[~2025-02-20 23:32 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-19 11:25 [PATCH RFC] mm: Fix kernel BUG when userfaultfd_move encounters swapcache Barry Song
2025-02-19 18:26 ` Suren Baghdasaryan
2025-02-19 18:30 ` David Hildenbrand
2025-02-19 18:58 ` Suren Baghdasaryan
2025-02-20 8:40 ` David Hildenbrand
2025-02-20 9:21 ` Barry Song
2025-02-20 10:24 ` David Hildenbrand
2025-02-26 5:37 ` Barry Song
2025-02-26 8:03 ` David Hildenbrand
2025-02-20 23:32 ` Peter Xu [this message]
2025-02-21 0:07 ` Barry Song
2025-02-21 1:49 ` Peter Xu
2025-02-22 21:31 ` Barry Song
2025-02-24 17:50 ` Peter Xu
2025-02-24 18:03 ` David Hildenbrand
2025-02-19 20:37 ` Barry Song
2025-02-19 20:57 ` Matthew Wilcox
2025-02-19 21:05 ` Barry Song
2025-02-19 21:02 ` Lokesh Gidra
2025-02-19 21:26 ` Barry Song
2025-02-19 21:32 ` Lokesh Gidra
2025-02-19 22:14 ` Peter Xu
2025-02-19 23:04 ` Barry Song
2025-02-19 23:19 ` Lokesh Gidra
2025-02-20 0:49 ` Barry Song
2025-02-20 22:59 ` Peter Xu
2025-02-20 23:47 ` Suren Baghdasaryan
2025-02-20 23:52 ` Suren Baghdasaryan
2025-02-21 0:36 ` Suren Baghdasaryan
2025-02-25 11:05 ` Barry Song
2025-02-25 15:34 ` Peter Xu
2025-02-25 17:02 ` Suren Baghdasaryan
2025-02-21 1:36 ` Barry Song
2025-02-21 1:54 ` Peter Xu
2025-02-20 8:51 ` David Hildenbrand
2025-02-20 9:31 ` Barry Song
2025-02-20 9:36 ` David Hildenbrand
2025-02-20 21:45 ` Barry Song
2025-02-20 22:19 ` Lokesh Gidra
2025-02-20 22:26 ` Barry Song
2025-02-20 22:31 ` David Hildenbrand
2025-02-20 22:33 ` Lokesh Gidra
2025-02-19 18:40 ` Lokesh Gidra
2025-02-19 20:45 ` Barry Song
2025-02-19 20:53 ` Lokesh Gidra
2025-02-19 22:31 ` Peter Xu
2025-02-20 0:50 ` Barry Song
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=Z7e7iYNvGweeGsRU@x1.local \
--to=peterx@redhat.com \
--cc=21cnbao@gmail.com \
--cc=Liam.Howlett@oracle.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=axelrasmussen@google.com \
--cc=bgeffon@google.com \
--cc=brauner@kernel.org \
--cc=david@redhat.com \
--cc=hughd@google.com \
--cc=jannh@google.com \
--cc=kaleshsingh@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lokeshgidra@google.com \
--cc=mhocko@suse.com \
--cc=ngeoffray@google.com \
--cc=rppt@kernel.org \
--cc=ryan.roberts@arm.com \
--cc=shuah@kernel.org \
--cc=stable@vger.kernel.org \
--cc=surenb@google.com \
--cc=v-songbaohua@oppo.com \
--cc=viro@zeniv.linux.org.uk \
--cc=willy@infradead.org \
--cc=yuzhao@google.com \
--cc=zhangpeng362@huawei.com \
--cc=zhengtangquan@oppo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.