From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 029D4C982D7 for ; Fri, 18 Sep 2026 21:42:27 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 11F0F6B0095; Fri, 18 Sep 2026 17:42:27 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0CE196B0096; Fri, 18 Sep 2026 17:42:27 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EDB176B0098; Fri, 18 Sep 2026 17:42:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id C36056B0095 for ; Fri, 18 Sep 2026 17:42:26 -0400 (EDT) Received: from smtpin05.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 50A7A406A8 for ; Fri, 18 Sep 2026 21:42:26 +0000 (UTC) X-FDA: 85228207092.05.6A7C46A Received: from mail-qk2-f13.google.com (mail-qk2-f13.google.com [74.125.230.205]) by imf16.hostedemail.com (Postfix) with ESMTP id 65DF7180007 for ; Fri, 18 Sep 2026 21:42:24 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=gourry.net header.s=google header.b=lCbgpcm5; spf=pass (imf16.hostedemail.com: domain of gourry@gourry.net designates 74.125.230.205 as permitted sender) smtp.mailfrom=gourry@gourry.net; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1789767744; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=JRywDyqUWmgr7b+daClWkuC5v3z0QnlFIvvPsPbWZ5Q=; b=cT/JnvSpikZ43TxTe/BoLcACOecVB8nY8ya5IqZ83lOu++M4qaJAW2vbDd68u/fQ0lpvt7 4EBzCuFywS0RRLrp2b2ArFqWoI5r0hLg1DN2jrZP/FDTw57gkUt0QEE7fhkjxQMPD7BEH3 P483wOXBi+3A0pVF21p3TD3Qt+pvY2U= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789767744; b=zPAhm2VKqIxHPniPG8XAhNhORJEe1v5Z1uh96jOgcMzLRDr5y7C6bCIxgkMz5KwHn95UAF 39d8WYOf4hnBbX5Mth39ItqmUQGQqt4dgGCp72R66ejuZwxJWkHAkTpkxgx4KNtSU3iN3E cdAHU+afmlZSEkOLVD5bCdtpd4w5Q8U= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=gourry.net header.s=google header.b=lCbgpcm5; spf=pass (imf16.hostedemail.com: domain of gourry@gourry.net designates 74.125.230.205 as permitted sender) smtp.mailfrom=gourry@gourry.net; dmarc=none Received: by mail-qk2-f13.google.com with SMTP id d75a77b69052e-52fb766bfd6so11128531cf.1 for ; Fri, 18 Sep 2026 14:42:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gourry.net; s=google; t=1789767743; x=1790372543; darn=kvack.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=JRywDyqUWmgr7b+daClWkuC5v3z0QnlFIvvPsPbWZ5Q=; b=lCbgpcm5OUp0ucNDFgwayYad0EvzRbyzDJbjmw5QKvEs/zUaqxLiwGajoJVy1UCfYY hk+7ZcjuMIIo5rwSiPHNB5eDH/nJ+tPACXmgPpGlv3YOYOcyD2U06y3oSzlH3uhLmo2k VOysGxrZKnNN2e/oS1ZdJRHXHVZ6JUYjjMcddG5md2dlZZ/rYTEWikIOOK9do58URgWe 6EqTkpaKIfJf1bV6NClJmIMcTgC14c6RI4SuXCFADmOSMnmDHN0K44XfDR4/+JRFQbof J8kUdioAc2/TQh6ok8FOd4smC/uv1CIq7wnky/YSIrOtwkDrZqbzi8aAtfrcnBfWMAUH 5CaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789767743; x=1790372543; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=JRywDyqUWmgr7b+daClWkuC5v3z0QnlFIvvPsPbWZ5Q=; b=QQsc63lemGqBHMyFGMHgN3i/e9aQ3TGf/8lJ2XZEcq/BWCyTJknZHs4F0dAeQbP/Oa VT/GCsbm8puBSG1Z7VqrB8Kmr/jxjjaO2N80z7j7Lw7YiBg1fvENuNLfGE6gu/yZ+6z4 kHqXX7EE22j2YmnaAilAuSQ1ESoq9hwHGt4UQtnqwpYXf7o1zsqyTDIXe9ojRHmO7PNC dziQuhr+usuIceCTryFVbnQyfO4mMILeWUU+Yz6zOfPOAa9xG/rAudcnn5NSHWTumbRO 7iu5g5IfdEYldmJXFJmS4+jO7ktQ8hF8Lrsb5lnm6tSgIf9mLL0dse3xXhJgISZCYsZK rTeg== X-Gm-Message-State: AFuF++nuUWU9bSg30XFzbl6QFiT4zafPySkXQxHOvXogReEo1FuHZF8g pXO2R9U4L0y1hyD/7cy0YoiJmSpQX2YIwChtWpVFch3J72RVh2PrtPYdmcjjXtywqWE= X-Gm-Gg: AYBFou2MmnzHWy3a8REJ8rYIENuAqdWzuYyNT0mfdPGzEvMNdis9HLjYEKnRUF3Wy3m 2bebA4KBGCIrtSoQ/IGClKXB5OOqwe71z3VACLGGxl+6CtRCfINkGO87R4oq+ZLoNloz4Bu+qcq UzgIYpalv0+AeVbb8OoBAID8WwKP/03Gtv+YHBNzlrV60ZMAX2nIrqet3N5sTKlkYjfsOUL9C9p /X8SVRrqrRnDnP9YKTB2l4vaL/BKS4Z+ogNfiYunHwM8yCzxCgJLTEL90kYtiANX72a9h3zzWKP 6VdIZQEV9xQfUNs3umlHfKTCg/qutes0N9LOvh1g5qq4gQNixdTSLhFSuSKiPFChRdr+SHoZi1q oqr6Id6yh0NNIR8tHiTkLuPN3Bu44zDeapVl6oyQfPRXXQVNrDAnpiu7YgLnxj+Zj5ax5lGKsgw wNYlmFFEa9f86aV5Lkje2zYczY+xZwO/JtdNXhE+ZlDvhFL1NeU4WSTul0vRnJiGwhzOxwVtg3F 6an9u4b0QZPs2z4MNt/8pjxMBsxZ5y/Xvuvx3zhgfOAyA4yINr6odTzJSjMD3pOvw== X-Received: by 2002:a05:622a:6094:b0:531:11ac:23d8 with SMTP id d75a77b69052e-5329e444f66mr69085321cf.49.1789767743500; Fri, 18 Sep 2026 14:42:23 -0700 (PDT) Received: from gourry-fedora-PF4VCD3F (pool-173-79-60-52.washdc.fios.verizon.net. [173.79.60.52]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-532ae750944sm6431301cf.25.2026.09.18.14.42.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Sep 2026 14:42:23 -0700 (PDT) Date: Fri, 18 Sep 2026 17:42:20 -0400 From: Gregory Price To: Zi Yan Cc: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "kernel-team@meta.com" , "akpm@linux-foundation.org" , "david@kernel.org" , "ljs@kernel.org" , "liam@infradead.org" , "vbabka@kernel.org" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "mingo@redhat.com" , "peterz@infradead.org" , "juri.lelli@redhat.com" , "vincent.guittot@linaro.org" , "dietmar.eggemann@arm.com" , "rostedt@goodmis.org" , "bsegall@google.com" , "mgorman@suse.de" , "vschneid@redhat.com" , "kprateek.nayak@amd.com" , "baolin.wang@linux.alibaba.com" , "nico.pache@linux.dev" , "ryan.roberts@arm.com" , "dev.jain@arm.com" , "baohua@kernel.org" , "lance.yang@linux.dev" , "usama.arif@linux.dev" , "kas@kernel.org" , "matthew.brost@intel.com" , "joshua.hahnjy@gmail.com" , "rakie.kim@sk.com" , "byungchul@sk.com" , "ying.huang@linux.alibaba.com" , Alistair Popple , "jannh@google.com" , "pfalcato@suse.de" , "osalvador@suse.de" , "hannes@cmpxchg.org" , "raghavendra.kt@amd.com" Subject: Re: [PATCH v2 0/4] sched/numa: stop VMA scan filters from gating promotion Message-ID: References: <20260911001826.2109390-1-gourry@gourry.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 65DF7180007 X-Stat-Signature: mgux7xi5ud6zurd8jkomqpaqxq37xax6 X-Rspam-User: X-HE-Tag: 1789767744-741541 X-HE-Meta: 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 OuJNwBZI 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Sep 18, 2026 at 04:56:34PM -0400, Zi Yan wrote: > > > > Tested on a host with 768GB/256GB DRAM/CXL. > > Ran 2 ~430GB database workloads with large (>300GB) shmem VMAs. > > Do you just launch them without any additional NUMA control or NUMA > policy configuration, like using numactl? Just want to understand the > scope of the issue and how well the fixes are tested. It might be good > to have a list of expected behaviors for people/AI to check against. > We found these issues while testing fairness controls with Joshua's tiered memcg limits patches [1]. We were seeing very lopsided bandwidth utilization between tiers. When dropped all the memcg extensions and tested these patches by themselves, we found that numa balancing was completely broken - starting with Johannes' shmem fix [2]. Otherwise - No other numa controls are used on these workloads. - no numactl - no mbind()/set_mempolicy() - no cpuset.mems - etc These fixes impact the fault-injecting side (spraying PROT_NONE), not the fault-handling side. So mempolicy and cpuset doesn't really come into the picture. It's more of an internal-consistency issue for numab itself. ~Gregory [1] https://lore.kernel.org/all/20260807202059.2620949-1-joshua.hahnjy@gmail.com/ [2] https://lore.kernel.org/all/20260629163337.1264881-1-hannes@cmpxchg.org/