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Sat, 01 May 2021 19:45:22 -0700 (PDT) MIME-Version: 1.0 References: <1792aea71ee.e2062a5f778082.9048268443626031415@xanmod.org> In-Reply-To: From: Yu Zhao Date: Sat, 1 May 2021 20:45:11 -0600 Message-ID: Subject: Re: LRU_GEN v2 & v5.12 build issue To: Alexandre Frade Cc: linux-mm , Kernel Page Reclaim v2 Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=google.com header.s=20161025 header.b=CXsneGVl; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf11.hostedemail.com: domain of yuzhao@google.com designates 209.85.221.43 as permitted sender) smtp.mailfrom=yuzhao@google.com X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 71DCB2000242 X-Stat-Signature: ye3kng6wiu7rnx9hstnfdbuk947nace1 Received-SPF: none (google.com>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=mail-wr1-f43.google.com; client-ip=209.85.221.43 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619923507-273368 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: On Sat, May 1, 2021 at 8:39 PM Yu Zhao wrote: > > On Sat, May 1, 2021 at 8:31 PM Alexandre Frade wrote: > > > > Dear Yu Zhao, > > > > I don't know if it's a known issue with the 5.12 kernel released [9f4ad9e]: > > > > LRU_GEN v2 & v5.12 final: > > Hi Alexandre, > > I think I hit this problem with Ubuntu too. Does your config include > the following? > CONFIG_MAXSMP=y > CONFIG_NODES_SHIFT=10 > CONFIG_NR_CPUS=8192 > If so, then it's the same problem: there are no spare bits left in > page->flags. Disabling > CONFIG_MAXSMP should fix it, unless you really want to use 8192 CPUs > and 1024 NUMA nodes :) > > Please let me know. Thanks! Sorry I forgot to clarify that this option should be disabled regardless whether you want to use the multigenerational lru or not. This option is for debugging and will bring unnecessary memory overhead to production systems.