From: David Hildenbrand <david@redhat.com>
To: Huang Ying <ying.huang@intel.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Yosry Ahmed <yosryahmed@google.com>,
Hugh Dickins <hughd@google.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Matthew Wilcox <willy@infradead.org>,
Michal Hocko <mhocko@suse.com>, Minchan Kim <minchan@kernel.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Yang Shi <shy828301@gmail.com>, Yu Zhao <yuzhao@google.com>,
Chris Li <chrisl@kernel.org>
Subject: Re: [PATCH -V3 4/5] swap: remove get/put_swap_device() in __swap_duplicate()
Date: Wed, 31 May 2023 09:46:37 +0200 [thread overview]
Message-ID: <9493177b-c435-9adc-cdfc-e45b91f02e77@redhat.com> (raw)
In-Reply-To: <20230529061355.125791-5-ying.huang@intel.com>
On 29.05.23 08:13, Huang Ying wrote:
> __swap_duplicate() is called by
>
> - swap_shmem_alloc(): the folio in swap cache is locked.
>
> - copy_nonpresent_pte() -> swap_duplicate() and try_to_unmap_one() ->
> swap_duplicate(): the page table lock is held.
>
> - __read_swap_cache_async() -> swapcache_prepare(): enclosed with
> get/put_swap_device() in __read_swap_cache_async() already.
>
> So, it's safe to remove get/put_swap_device() in __swap_duplicate().
>
> Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
> Reviewed-by: Yosry Ahmed <yosryahmed@google.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Hugh Dickins <hughd@google.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Matthew Wilcox <willy@infradead.org>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: Minchan Kim <minchan@kernel.org>
> Cc: Tim Chen <tim.c.chen@linux.intel.com>
> Cc: Yang Shi <shy828301@gmail.com>
> Cc: Yu Zhao <yuzhao@google.com>
> Cc: Chris Li <chrisl@kernel.org>
> ---
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2023-05-31 7:46 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-29 6:13 [PATCH -V3 0/5] swap: cleanup get/put_swap_device() usage Huang Ying
2023-05-29 6:13 ` [PATCH -V3 1/5] swap: Remove get/put_swap_device() in __swap_count() Huang Ying
2023-05-29 6:13 ` [PATCH -V3 2/5] swap, __read_swap_cache_async(): enlarge get/put_swap_device protection range Huang Ying
2023-05-31 7:45 ` David Hildenbrand
2023-05-29 6:13 ` [PATCH -V3 3/5] swap: remove __swp_swapcount() Huang Ying
2023-05-31 7:45 ` David Hildenbrand
2023-05-29 6:13 ` [PATCH -V3 4/5] swap: remove get/put_swap_device() in __swap_duplicate() Huang Ying
2023-05-31 7:46 ` David Hildenbrand [this message]
2023-05-29 6:13 ` [PATCH -V3 5/5] swap: comments get_swap_device() with usage rule Huang Ying
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=9493177b-c435-9adc-cdfc-e45b91f02e77@redhat.com \
--to=david@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=chrisl@kernel.org \
--cc=hannes@cmpxchg.org \
--cc=hughd@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=minchan@kernel.org \
--cc=shy828301@gmail.com \
--cc=tim.c.chen@linux.intel.com \
--cc=willy@infradead.org \
--cc=ying.huang@intel.com \
--cc=yosryahmed@google.com \
--cc=yuzhao@google.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox