From: Nhat Pham <nphamcs@gmail.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Usama Arif <usamaarif642@gmail.com>,
linux-mm@kvack.org, akpm@linux-foundation.org, hughd@google.com,
yosry.ahmed@linux.dev, mhocko@kernel.org,
roman.gushchin@linux.dev, shakeel.butt@linux.dev,
muchun.song@linux.dev, len.brown@intel.com,
chengming.zhou@linux.dev, kasong@tencent.com, chrisl@kernel.org,
huang.ying.caritas@gmail.com, ryan.roberts@arm.com,
viro@zeniv.linux.org.uk, baohua@kernel.org, osalvador@suse.de,
lorenzo.stoakes@oracle.com, christophe.leroy@csgroup.eu,
pavel@kernel.org, kernel-team@meta.com,
linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
linux-pm@vger.kernel.org
Subject: Re: [RFC PATCH 00/14] Virtual Swap Space
Date: Tue, 8 Apr 2025 09:27:25 -0700 [thread overview]
Message-ID: <CAKEwX=MAeT+ag9mNq7-yfVBzgGQ7y+SN_p7DQnto01TG33EAPQ@mail.gmail.com> (raw)
In-Reply-To: <CAKEwX=M3do_7SJGKwfZQ8vOSQN4aM1ZU04Q3E99CW=UTCkUMOQ@mail.gmail.com>
On Tue, Apr 8, 2025 at 9:25 AM Nhat Pham <nphamcs@gmail.com> wrote:
>
>
> You're right. I haven't touched the swapfile swap map and the zeromap
> bitmap at all, primarily because it's non-functional change
> (optimization only). It also adds more ifdefs to the final codebase :)
>
> In the next version, I can tag on one patch to:
>
> 1. remove zeromap bitmap. This one is pretty much straightforward -
> we're not using it at all.
>
> 2. Swap map reduction. I'm like 70% sure we don't need SWAP_MAP_BAD
> state. With the vswap reverse map and the swapfile inuse counters, we
> should be able to convert the swapmap into a pure bitmap. If we can't,
> then it's 2 bits per physical swapfiles.
s/physical swapfiles/physical swap slot (3 states - unallocated,
allocated, bad slot. the latter two might be mergeable).
next prev parent reply other threads:[~2025-04-08 16:27 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-07 23:42 Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 01/14] swapfile: rearrange functions Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 02/14] mm: swap: add an abstract API for locking out swapoff Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 03/14] mm: swap: add a separate type for physical swap slots Nhat Pham
2025-04-08 14:15 ` Johannes Weiner
2025-04-08 15:11 ` Nhat Pham
2025-04-22 14:41 ` Yosry Ahmed
[not found] ` <6807ab09.670a0220.152ca3.502fSMTPIN_ADDED_BROKEN@mx.google.com>
2025-04-22 15:50 ` Nhat Pham
2025-04-22 18:50 ` Kairui Song
2025-04-07 23:42 ` [RFC PATCH 04/14] mm: swap: swap cache support for virtualized swap Nhat Pham
2025-04-08 15:00 ` Johannes Weiner
2025-04-08 15:34 ` Nhat Pham
2025-04-08 15:43 ` Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 05/14] zswap: unify zswap tree " Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 06/14] mm: swap: allocate a virtual swap slot for each swapped out page Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 07/14] swap: implement the swap_cgroup API using virtual swap Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 08/14] swap: manage swap entry lifetime at the virtual swap layer Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 09/14] swap: implement locking out swapoff using virtual swap slot Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 10/14] mm: swap: decouple virtual swap slot from backing store Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 11/14] memcg: swap: only charge physical swap slots Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 12/14] vswap: support THP swapin and batch free_swap_and_cache Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 13/14] swap: simplify swapoff using virtual swap Nhat Pham
2025-04-07 23:42 ` [RFC PATCH 14/14] zswap: do not start zswap shrinker if there is no physical swap slots Nhat Pham
2025-04-08 13:04 ` [RFC PATCH 00/14] Virtual Swap Space Usama Arif
2025-04-08 15:20 ` Nhat Pham
2025-04-08 15:45 ` Johannes Weiner
2025-04-08 16:25 ` Nhat Pham
2025-04-08 16:27 ` Nhat Pham [this message]
2025-04-08 16:22 ` Kairui Song
2025-04-08 16:47 ` Nhat Pham
2025-04-08 16:59 ` Kairui Song
2025-04-22 14:43 ` Yosry Ahmed
2025-04-22 14:56 ` Yosry Ahmed
[not found] ` <6807afd0.a70a0220.2ae8b9.e07cSMTPIN_ADDED_BROKEN@mx.google.com>
2025-04-22 17:15 ` Nhat Pham
2025-04-22 19:29 ` Nhat Pham
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