linux-mm.kvack.org archive mirror
 help / color / mirror / Atom feed
From: Nhat Pham <nphamcs@gmail.com>
To: Kairui Song <ryncsn@gmail.com>
Cc: linux-mm@kvack.org, akpm@linux-foundation.org,
	hannes@cmpxchg.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,
	chrisl@kernel.org,  huang.ying.caritas@gmail.com,
	ryan.roberts@arm.com, shikemeng@huaweicloud.com,
	 viro@zeniv.linux.org.uk, baohua@kernel.org, bhe@redhat.com,
	osalvador@suse.de,  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, peterx@redhat.com, riel@surriel.com,
	 joshua.hahnjy@gmail.com, npache@redhat.com, gourry@gourry.net,
	 axelrasmussen@google.com, yuanchu@google.com,
	weixugc@google.com,  rafael@kernel.org, jannh@google.com,
	pfalcato@suse.de,  zhengqi.arch@bytedance.com
Subject: Re: [PATCH v3 00/20] Virtual Swap Space
Date: Tue, 10 Feb 2026 11:23:27 -0800	[thread overview]
Message-ID: <CAKEwX=OYauRgQoj7cxznpROknHt9NsKLOmkvaFtkEh8T1KASag@mail.gmail.com> (raw)
In-Reply-To: <CAKEwX=OUni7PuUqGQUhbMDtErurFN_i=1RgzyQsNXy4LABhXoA@mail.gmail.com>

On Tue, Feb 10, 2026 at 11:11 AM Nhat Pham <nphamcs@gmail.com> wrote:
>>
> Hmm this one I don't think I can reproduce without your laptop ;)
>
> Jokes aside, I did try to run the kernel build with disk swapping, and
> the performance is on par with baseline. Swap performance with NVME
> swap tends to be dominated by IO work in my experiments. Do you think
> I missed something here? Maybe it's the concurrency difference (since
> I always run with -j$(nproc), i.e the number of workers == the number
> of processors).

Ah I just noticed that your numbers include only systime. Ignore my IO
comments then.

(I still think in real production system, with disk swapping enabled,
then IO wait time is going to be really important. If you're going to
use disk swap, then this affects real time just as much if not more
than kernel CPU overhead).


  reply	other threads:[~2026-02-10 19:23 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-02-08 21:58 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 [this message]
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
2026-02-10  6:31   ` Dan Carpenter
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

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='CAKEwX=OYauRgQoj7cxznpROknHt9NsKLOmkvaFtkEh8T1KASag@mail.gmail.com' \
    --to=nphamcs@gmail.com \
    --cc=akpm@linux-foundation.org \
    --cc=axelrasmussen@google.com \
    --cc=baohua@kernel.org \
    --cc=bhe@redhat.com \
    --cc=cgroups@vger.kernel.org \
    --cc=chengming.zhou@linux.dev \
    --cc=chrisl@kernel.org \
    --cc=christophe.leroy@csgroup.eu \
    --cc=gourry@gourry.net \
    --cc=hannes@cmpxchg.org \
    --cc=huang.ying.caritas@gmail.com \
    --cc=hughd@google.com \
    --cc=jannh@google.com \
    --cc=joshua.hahnjy@gmail.com \
    --cc=kernel-team@meta.com \
    --cc=len.brown@intel.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=mhocko@kernel.org \
    --cc=muchun.song@linux.dev \
    --cc=npache@redhat.com \
    --cc=osalvador@suse.de \
    --cc=pavel@kernel.org \
    --cc=peterx@redhat.com \
    --cc=pfalcato@suse.de \
    --cc=rafael@kernel.org \
    --cc=riel@surriel.com \
    --cc=roman.gushchin@linux.dev \
    --cc=ryan.roberts@arm.com \
    --cc=ryncsn@gmail.com \
    --cc=shakeel.butt@linux.dev \
    --cc=shikemeng@huaweicloud.com \
    --cc=viro@zeniv.linux.org.uk \
    --cc=weixugc@google.com \
    --cc=yosry.ahmed@linux.dev \
    --cc=yuanchu@google.com \
    --cc=zhengqi.arch@bytedance.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