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Fri, 26 Sep 2025 11:55:16 -0400 X-MC-Unique: tIcUB22VPvSQZNQinzN9tA-1 X-Mimecast-MFC-AGG-ID: tIcUB22VPvSQZNQinzN9tA_1758902114 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 32BDC1800562; Fri, 26 Sep 2025 15:55:14 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.72.112.25]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C197818001C6; Fri, 26 Sep 2025 15:55:08 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, chrisl@kernel.org, kasong@tencent.com, youngjun.park@lge.com, aaron.lu@intel.com, baohua@kernel.org, shikemeng@huaweicloud.com, nphamcs@gmail.com, Baoquan He Subject: [PATCH v2 0/1] mm/swapfile.c: select the swap device with default priority round robin Date: Fri, 26 Sep 2025 23:55:03 +0800 Message-ID: <20250926155504.5122-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: GcHg6yGq9GomqOA5rldR_cg2kCegUmDW7geaovB-1KE_1758902114 X-Mimecast-Originator: redhat.com Content-type: text/plain Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 4C08A14000D X-Rspamd-Server: rspam05 X-Stat-Signature: xm5stau3d4i5jf64n6b3u6gqgmhzj88s X-Rspam-User: X-HE-Tag: 1758902118-96716 X-HE-Meta: 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 8h1Yb1Vq eK79TeW+8zNMPr7emPWlKFrIHWWQd35q9SkizxvF4FQefGvgRkoCU5z0FgUgx1bhUr49Jbzg1yt7sudxWTS+Ac1cnfY6ToUetIMMKf7Ud2zQaUWMK8IbuZw9oJAJWKRcePMsLte9vIAcZQZp5fR8A58ilGyykfVJYJsHKwR1rlt2LXi0vimpEF11UIxfMyHirTz2QA5+QFW7WJ83EK1S3HBVLYfEUKowVANIxJReHPv8l+UuHnANxLHpvhSb/jabq9qYbOaOA7lP+pXiH9TKImg/CfoJtfaUv1NzOy7A0p/3eJd8W8jcSmWOV9U8/oFeI8MZH0TfNwYpwqxLYEjLpgoMpQAsjSmNbYkFd X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The detailed information about patch can be found in patch log. Here I would like to add testing related information. On my system, it has 8 nodes, 64G RAM. So I created 4 zram devices of size 16G. Doing this because I can't find system with 4 free SSD disk which can be used as swap devices. And nowadays, swap, zram become more and more popular, even default setup, so I create zram to test patch. # free -h total used free shared buff/cache available Mem: 62Gi 1.6Gi 61Gi 4.8Mi 276Mi 61Gi Swap: 63Gi 0B 63Gi 1) create zram #My fedora will add one zram0 by default, I reset it because the zram size if not enough swapoff /dev/zram0 cd /sys/block/ echo 1 > zram0/reset cat /sys/class/zram-control/hot_add cat /sys/class/zram-control/hot_add cat /sys/class/zram-control/hot_add echo 16G > zram0/disksize echo 16G > zram1/disksize echo 16G > zram2/disksize echo 16G > zram3/disksize mkswap /dev/zram0 mkswap /dev/zram1 mkswap /dev/zram2 mkswap /dev/zram3 swapon /dev/zram0 swapon /dev/zram1 swapon /dev/zram2 swapon /dev/zram3 2) Create memcg with 4G (this avoids noise from other anon process in system) cd /sys/fs/cgroup/ mkdir testing echo 4G > testing/memory.max echo 3G > testing/memory.high 3) Run usemem in memcg cgexec -g memory:testing ~/vm-scalability/usemem --init-time -O -y -x -n 31 2G > ~/vm-scalability/temp.txt The usemem output is not easy to understand, I will attach my draft script in thread for easing result collecting and statistics. Changelog: v1->v2: - Remove Documentation/admin-guide/mm/swap_numa.rst; - Add back mistakenly removed lockdep_assert_held() line; - Remove the unneeded code comment in _enable_swap_info(). Thanks a lot for careful reviewing from Chris, YoungJun and Kairui. Baoquan He (1): mm/swapfile.c: select the swap device with default priority round robin Documentation/admin-guide/mm/swap_numa.rst | 78 --------------- include/linux/swap.h | 11 +-- mm/swapfile.c | 109 +++------------------ 3 files changed, 16 insertions(+), 182 deletions(-) delete mode 100644 Documentation/admin-guide/mm/swap_numa.rst -- 2.41.0