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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id l7-20020a37f507000000b0047b528ef416sm4030551qkk.93.2022.02.27.10.33.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Feb 2022 10:33:06 -0800 (PST) Date: Sun, 27 Feb 2022 10:32:52 -0800 (PST) From: Hugh Dickins X-X-Sender: hugh@ripple.anvils To: Liam Howlett cc: Nathan Chancellor , Qian Cai , "maple-tree@lists.infradead.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , Andrew Morton , Mark Brown , Stephen Rothwell , Suren Baghdasaryan , Matthew Wilcox Subject: Re: [PATCH v6 00/71] Introducing the Maple Tree In-Reply-To: <5f8f4f-ad63-eb-fd73-d48748af8a76@google.com> Message-ID: <546e7b7b-ab50-d1fa-6a67-2c9dd9e9688e@google.com> References: <20220215143728.3810954-1-Liam.Howlett@oracle.com> <20220225190846.u4fwebimd5ejfdpd@revolver> <20220225202334.bsw5t3retcchpn2e@revolver> <20220226015803.h4w6y3doe3om2sbc@revolver> <5f8f4f-ad63-eb-fd73-d48748af8a76@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 56B4E40007 X-Stat-Signature: dbx8e8azjtiifcjf68x5ettbbfbacjy4 Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=XtAlzy9Y; spf=pass (imf12.hostedemail.com: domain of hughd@google.com designates 209.85.160.176 as permitted sender) smtp.mailfrom=hughd@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspam-User: X-HE-Tag: 1645986787-874526 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, 26 Feb 2022, Hugh Dickins wrote: > > I say "often": it's very erratic. Once, a machine booted with mem=1G > ran kernel builds successfully swapping for 4.5 hours before faulting > in __nr_to_section in virt_to_folio ... while doing a __vma_adjust() - > you'll ask me for a full stacktrace, and I'll answer sorry, too many, > please try for yourself. Another time, for 1.5 hours before hitting > the BUG_ON(is_migration_entry(entry) && !PageLocked(p)) in > pfn_swap_entry_to_page() - suggesting anon_vma locking had not been > right while doing page migration (I was exercising THPs a lot). > But now, can I even get it to complete the boot sequence? Sorry, I never mentioned the architecture: x86_64 throughout for me.