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[192.134.164.104]) by mx.google.com with ESMTPS id x7si2796062wru.417.2019.02.12.11.59.47 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 12 Feb 2019 11:59:47 -0800 (PST) Received-SPF: pass (google.com: domain of brice.goglin@inria.fr designates 192.134.164.104 as permitted sender) client-ip=192.134.164.104; Authentication-Results: mx.google.com; spf=pass (google.com: domain of brice.goglin@inria.fr designates 192.134.164.104 as permitted sender) smtp.mailfrom=Brice.Goglin@inria.fr X-IronPort-AV: E=Sophos;i="5.58,362,1544482800"; d="scan'208";a="295985158" Received: from 91-160-5-165.subs.proxad.net (HELO [192.168.44.23]) ([91.160.5.165]) by mail3-relais-sop.national.inria.fr with ESMTP/TLS/AES128-SHA; 12 Feb 2019 20:59:45 +0100 Subject: Re: [PATCH 5/5] dax: "Hotplug" persistent memory for use like normal RAM To: Dave Hansen , linux-kernel@vger.kernel.org Cc: thomas.lendacky@amd.com, mhocko@suse.com, linux-nvdimm@lists.01.org, tiwai@suse.de, ying.huang@intel.com, linux-mm@kvack.org, jglisse@redhat.com, bp@suse.de, baiyaowei@cmss.chinamobile.com, zwisler@kernel.org, bhelgaas@google.com, fengguang.wu@intel.com, akpm@linux-foundation.org References: <20190124231441.37A4A305@viggo.jf.intel.com> <20190124231448.E102D18E@viggo.jf.intel.com> <26ac36f4-7391-5321-217b-50d67e2119d7@intel.com> From: Brice Goglin Openpgp: preference=signencrypt Autocrypt: addr=Brice.Goglin@inria.fr; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.0 MIME-Version: 1.0 In-Reply-To: <26ac36f4-7391-5321-217b-50d67e2119d7@intel.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US 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: Le 11/02/2019 à 17:22, Dave Hansen a écrit : > On 2/9/19 3:00 AM, Brice Goglin wrote: >> I've used your patches on fake hardware (memmap=xx!yy) with an older >> nvdimm-pending branch (without Keith's patches). It worked fine. This >> time I am running on real Intel hardware. Any idea where to look ? > I've run them on real Intel hardware too. > > Could you share the exact sequence of commands you're issuing to > reproduce the hang? My guess would be that there's some odd interaction > between Dan's latest branch and my now (slightly) stale patches. > > I'll refresh them this week and see if I can reproduce what you're seeing. # ndctl disable-region all # ndctl zero-labels all # ndctl enable-region region0 # ndctl create-namespace -r region0 -t pmem -m devdax { "dev":"namespace0.0", "mode":"devdax", "map":"dev", "size":"1488.37 GiB (1598.13 GB)", "uuid":"ad0096d7-3fe7-4402-b529-ad64ed0bf789", "daxregion":{ "id":0, "size":"1488.37 GiB (1598.13 GB)", "align":2097152, "devices":[ { "chardev":"dax0.0", "size":"1488.37 GiB (1598.13 GB)" } ] }, "align":2097152 } # ndctl enable-namespace namespace0.0 # echo -n dax0.0 > /sys/bus/dax/drivers/device_dax/remove_id I tried with and without dax_pmem_compat loaded, but it doesn't help. Brice