From: Askar Safin <safinaskar@gmail.com>
To: nphamcs@gmail.com
Cc: akpm@linux-foundation.org, axelrasmussen@google.com,
baohua@kernel.org, bhe@redhat.com, cgroups@vger.kernel.org,
chengming.zhou@linux.dev, chrisl@kernel.org,
christophe.leroy@csgroup.eu, gourry@gourry.net,
hannes@cmpxchg.org, huang.ying.caritas@gmail.com,
hughd@google.com, jannh@google.com, joshua.hahnjy@gmail.com,
kasong@tencent.com, kernel-team@meta.com, len.brown@intel.com,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-pm@vger.kernel.org, lorenzo.stoakes@oracle.com,
mhocko@kernel.org, muchun.song@linux.dev, npache@redhat.com,
osalvador@suse.de, pavel@kernel.org, peterx@redhat.com,
pfalcato@suse.de, rafael@kernel.org, riel@surriel.com,
roman.gushchin@linux.dev, ryan.roberts@arm.com,
shakeel.butt@linux.dev, shikemeng@huaweicloud.com,
viro@zeniv.linux.org.uk, weixugc@google.com,
yosry.ahmed@linux.dev, yuanchu@google.com,
zhengqi.arch@bytedance.com
Subject: Re: [PATCH v3 00/20] Virtual Swap Space
Date: Wed, 25 Feb 2026 04:04:24 +0300 [thread overview]
Message-ID: <20260225010425.2876986-1-safinaskar@gmail.com> (raw)
In-Reply-To: <20260208215839.87595-1-nphamcs@gmail.com>
Nhat Pham <nphamcs@gmail.com>:
> * Simplify and optimize swapoff: we only have to fault the page in and
> have the virtual swap slot points to the page instead of the on-disk
> physical swap slot. No need to perform any page table walking.
Some time ago on Linux 6.1.124 I typed "swapoff -a". OOM killer started
and killed all my apps. And "swapoff" itself eventially failed.
So, it seems swapoff is very destructive operation.
Please, make swapoff non-destructive. Or create some alternative
non-destructive swapoff. Such swapoff should try to swapoff without
killing anything. If this is not possible, it simply should return error.
I don't think optimizing current dangerous swapoff is right thing to do.
--
Askar Safin
next prev parent reply other threads:[~2026-02-25 1:04 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-08 21:58 [PATCH v3 00/20] Virtual Swap Space Nhat Pham
2026-02-08 21:58 ` [PATCH v3 01/20] mm/swap: decouple swap cache from physical swap infrastructure Nhat Pham
2026-02-08 22:26 ` [PATCH v3 00/20] Virtual Swap Space Nhat Pham
2026-02-10 17:59 ` Kairui Song
2026-02-10 18:52 ` Johannes Weiner
2026-02-10 19:11 ` Nhat Pham
2026-02-10 19:23 ` Nhat Pham
2026-02-12 5:07 ` Chris Li
2026-02-17 23:36 ` Nhat Pham
2026-02-10 21:58 ` Chris Li
2026-02-20 21:05 ` [PATCH] vswap: fix poor batching behavior of vswap free path Nhat Pham
2026-02-08 22:31 ` [PATCH v3 00/20] Virtual Swap Space Nhat Pham
2026-02-09 12:20 ` Chris Li
2026-02-10 2:36 ` Johannes Weiner
2026-02-10 21:24 ` Chris Li
2026-02-10 23:01 ` Johannes Weiner
2026-02-10 18:00 ` Nhat Pham
2026-02-10 23:17 ` Chris Li
2026-02-08 22:39 ` Nhat Pham
2026-02-09 2:22 ` [PATCH v3 01/20] mm/swap: decouple swap cache from physical swap infrastructure kernel test robot
2026-02-08 21:58 ` [PATCH v3 02/20] swap: rearrange the swap header file Nhat Pham
2026-02-08 21:58 ` [PATCH v3 03/20] mm: swap: add an abstract API for locking out swapoff Nhat Pham
2026-02-08 21:58 ` [PATCH v3 04/20] zswap: add new helpers for zswap entry operations Nhat Pham
2026-02-08 21:58 ` [PATCH v3 05/20] mm/swap: add a new function to check if a swap entry is in swap cached Nhat Pham
2026-02-08 21:58 ` [PATCH v3 06/20] mm: swap: add a separate type for physical swap slots Nhat Pham
2026-02-08 21:58 ` [PATCH v3 07/20] mm: create scaffolds for the new virtual swap implementation Nhat Pham
2026-02-08 21:58 ` [PATCH v3 08/20] zswap: prepare zswap for swap virtualization Nhat Pham
2026-02-08 21:58 ` [PATCH v3 09/20] mm: swap: allocate a virtual swap slot for each swapped out page Nhat Pham
2026-02-09 17:12 ` kernel test robot
2026-02-11 13:42 ` kernel test robot
2026-02-08 21:58 ` [PATCH v3 10/20] swap: move swap cache to virtual swap descriptor Nhat Pham
2026-02-08 21:58 ` [PATCH v3 11/20] zswap: move zswap entry management to the " Nhat Pham
2026-02-08 21:58 ` [PATCH v3 12/20] swap: implement the swap_cgroup API using virtual swap Nhat Pham
2026-02-08 21:58 ` [PATCH v3 13/20] swap: manage swap entry lifecycle at the virtual swap layer Nhat Pham
2026-02-08 21:58 ` [PATCH v3 14/20] mm: swap: decouple virtual swap slot from backing store Nhat Pham
2026-02-08 21:58 ` [PATCH v3 15/20] zswap: do not start zswap shrinker if there is no physical swap slots Nhat Pham
2026-02-08 21:58 ` [PATCH v3 16/20] swap: do not unnecesarily pin readahead swap entries Nhat Pham
2026-02-08 21:58 ` [PATCH v3 17/20] swapfile: remove zeromap bitmap Nhat Pham
2026-02-08 21:58 ` [PATCH v3 18/20] memcg: swap: only charge physical swap slots Nhat Pham
2026-02-09 2:01 ` kernel test robot
2026-02-09 2:12 ` kernel test robot
2026-02-08 21:58 ` [PATCH v3 19/20] swap: simplify swapoff using virtual swap Nhat Pham
2026-02-08 21:58 ` [PATCH v3 20/20] swapfile: replace the swap map with bitmaps Nhat Pham
2026-02-08 22:51 ` [PATCH v3 00/20] Virtual Swap Space Nhat Pham
2026-02-12 12:23 ` David Hildenbrand (Arm)
2026-02-12 17:29 ` Nhat Pham
2026-02-12 17:39 ` Nhat Pham
2026-02-12 20:11 ` David Hildenbrand (Arm)
2026-02-12 17:41 ` David Hildenbrand (Arm)
2026-02-12 17:45 ` Nhat Pham
2026-02-10 15:45 ` [syzbot ci] " syzbot ci
2026-02-25 0:09 ` [PATCH v3 00/20] " Askar Safin
2026-02-25 1:04 ` Askar Safin [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-02-09 15:37 [PATCH v3 14/20] mm: swap: decouple virtual swap slot from backing store kernel test robot
2026-02-10 6:31 ` Dan Carpenter
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