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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5233DC25B4F for ; Mon, 6 May 2024 19:27:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E2FC56B0092; Mon, 6 May 2024 15:27:18 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DDF576B00A1; Mon, 6 May 2024 15:27:18 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C806B6B00A2; Mon, 6 May 2024 15:27:18 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id AA3056B0092 for ; Mon, 6 May 2024 15:27:18 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 57478C0645 for ; Mon, 6 May 2024 19:27:18 +0000 (UTC) X-FDA: 82088954556.27.E8663DF Received: from mailout2.w2.samsung.com (mailout2.w2.samsung.com [211.189.100.12]) by imf25.hostedemail.com (Postfix) with ESMTP id 74ACEA0005 for ; Mon, 6 May 2024 19:27:14 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=samsung.com header.s=mail20170921 header.b=MnElFODV; dmarc=pass (policy=none) header.from=samsung.com; spf=pass (imf25.hostedemail.com: domain of a.manzanares@samsung.com designates 211.189.100.12 as permitted sender) smtp.mailfrom=a.manzanares@samsung.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1715023635; 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:content-transfer-encoding:in-reply-to: references:references:dkim-signature; bh=qgUXmuEvpZEMMkoIcaOwLLWWNc96RMPxkgBeekrSEbY=; b=4Y0rtQunWBiv0uOKzMprx4G1NoIiTD40jXa2p2m1QIpZiFazAkkWbzaZvePkdOuWSqj1Br 44h3X7b0sQ5vMLsb+zxrzjof+FJnXHcqHWdcj9qgnanfdKjjMSqlJjNIBrEIIRgUn65A+n QqyArSwVDshBbiObcluPGgsNVs8zLbI= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=samsung.com header.s=mail20170921 header.b=MnElFODV; dmarc=pass (policy=none) header.from=samsung.com; spf=pass (imf25.hostedemail.com: domain of a.manzanares@samsung.com designates 211.189.100.12 as permitted sender) smtp.mailfrom=a.manzanares@samsung.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1715023635; a=rsa-sha256; cv=none; b=m7nGQKj7zE60SGT9VtbDgw2aRJZsupNo8BqU21zhDC6nHuamcBT5lRIavd2AUP58CkHb1d BDavug0nv4scCKiaGGij5EdzQ2bY12jYtgB1lFhvm1i9VFg8zIHwauowYWydd06h7ZLpTU Yq6nUJyHoIJbVsxX8UFsiUiJwhWQrqE= Received: from uscas1p1.samsung.com (unknown [182.198.245.206]) by mailout2.w2.samsung.com (KnoxPortal) with ESMTP id 20240506192712usoutp02a7fd872013caa01356bbc91300710432~M-OhNNr1O0084000840usoutp02N; Mon, 6 May 2024 19:27:12 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout2.w2.samsung.com 20240506192712usoutp02a7fd872013caa01356bbc91300710432~M-OhNNr1O0084000840usoutp02N DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1715023632; bh=qgUXmuEvpZEMMkoIcaOwLLWWNc96RMPxkgBeekrSEbY=; h=From:To:CC:Subject:Date:References:From; b=MnElFODV0bTtv7jIIqS+c2gQRQp8HR2zJNh+OBLMrcdNhS5PE8wj6Z6PYa8z666k7 AMIKcXHl62bMBHIf1yCh+gS12fFSEfwNMYbEQQFgnoDqFH6GGu6LFXmF/xRrSrap+v oxigb8KMEnyo5MDidKjK266dGiqYj6C21HoVhYxg= Received: from ussmges2new.samsung.com (u111.gpu85.samsung.co.kr [203.254.195.111]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240506192712uscas1p298e23e311f906ba6de129f1eb0e1cef3~M-OhB2c2O1663016630uscas1p2F; Mon, 6 May 2024 19:27:12 +0000 (GMT) Received: from uscas1p2.samsung.com ( [182.198.245.207]) by ussmges2new.samsung.com (USCPEMTA) with SMTP id 0B.BB.09749.01F29366; Mon, 6 May 2024 15:27:12 -0400 (EDT) Received: from ussmgxs2new.samsung.com (u91.gpu85.samsung.co.kr [203.254.195.91]) by uscas1p2.samsung.com (KnoxPortal) with ESMTP id 20240506192712uscas1p225316f79bb69f979b647d2a06a00a25f~M-Ogk8mG81446114461uscas1p29; Mon, 6 May 2024 19:27:12 +0000 (GMT) X-AuditID: cbfec36f-bebff70000002615-23-66392f1057b2 Received: from SSI-EX2.ssi.samsung.com ( [105.128.3.67]) by ussmgxs2new.samsung.com (USCPEXMTA) with SMTP id EE.EF.09795.F0F29366; Mon, 6 May 2024 15:27:11 -0400 (EDT) Received: from SSI-EX3.ssi.samsung.com (105.128.2.228) by SSI-EX2.ssi.samsung.com (105.128.2.227) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id 15.1.2507.35; Mon, 6 May 2024 12:27:11 -0700 Received: from SSI-EX3.ssi.samsung.com ([105.128.5.228]) by SSI-EX3.ssi.samsung.com ([105.128.5.228]) with mapi id 15.01.2507.035; Mon, 6 May 2024 12:27:10 -0700 From: Adam Manzanares To: "lsf-pc@lists.linux-foundation.org" , "dan.j.williams@intel.com" , "jonathan.cameron@huawei.com" , "dave@stgolabs.net" , Fan Ni , "dave.jiang@intel.com" , "ira.weiny@intel.com" , "alison.schofield@intel.com" , "vishal.l.verma@intel.com" , "gourry.memverge@gmail.com" , "wj28.lee@gmail.com" , "rientjes@google.com" , "ruansy.fnst@fujitsu.com" , "shradha.t@samsung.com" , "mcgrof@kernel.org" , Jim Harris , "mhocko@suse.com" CC: "linux-mm@kvack.org" , "linux-cxl@vger.kernel.org" , "linux-pci@vger.kernel.org" Subject: [LSF/MM/BPF TOPIC] CXL Development Discussions Thread-Topic: [LSF/MM/BPF TOPIC] CXL Development Discussions Thread-Index: AQHan+tkd4BPRAK+n02hrtqAe44hSQ== Date: Mon, 6 May 2024 19:27:10 +0000 Message-ID: <9bf86b97-319f-4f58-b658-1fe3ed0b1993@nmtadam.samsung> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [105.128.2.176] Content-Type: text/plain; charset="us-ascii" Content-ID: <5A48A5029EF4A842AAA1F52896BCC6F3@ssi.samsung.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrOKsWRmVeSWpSXmKPExsWy7djX87oC+pZpBsumyFrcfXyBzWL61AuM FiduNrJZrL65htHixZ/nTBb7nz5nsVi18BqbxflZp1gs7q35z2pxdt5xNot9r/cyW9yY8JTR 4n6fg0Xbko1MFgvutbNY3JpwjMli/Z4FrA6CHhua3rB57Jx1l91jwaZSj5Yjb1k9Fu95yeSx aVUnm8emT5PYPSbfWM7oMXV2vcf6LVdZPD5vkgvgjuKySUnNySxLLdK3S+DKmDKZpeCKQEXP 7gtsDYyXebsYOTkkBEwkFt57wQJiCwmsZJRo2FTcxcgFZLcySeyc95URrujvHHaIxBpGiZOH NjNCOB8ZJc7OucAE0b6UUeLrbT4Qm03AQOL38Y3MIEUiAlfZJCb8X8IK4jALLGaU6N/ymhWk SljAXGLepKtAVRxAVTYSn58LgIRFBPQkZu75BjaURUBFounebkaQEl4BJ4mlJyVAwowCYhLf T60BK2EWEJe49WQ+E8SlghKLZu9hhrDFJP7tesgGYStK3P/+kh2iXkdiwe5PbBC2ncSR9U+h 4toSyxa+BuvlBZpzcuYTFoheSYmDK26wgJwvIbCZU+Lbg4msEAkXiV9PmqCKpCX+3l0GdUS+ xK62K1BHVEhcfd0NdYS1xMI/66GO5pP4++sR4wRG5VlIfpiF5L5ZSO6bheS+WUjuW8DIuopR vLS4ODc9tdgoL7Vcrzgxt7g0L10vOT93EyMwbZ7+dzh/B+P1Wx/1DjEycTAeYpTgYFYS4T3a bp4mxJuSWFmVWpQfX1Sak1p8iFGag0VJnNfQ9mSykEB6YklqdmpqQWoRTJaJg1Oqgck5tS58 VoVdxsrdBzyfrHL51mW/c+eX9WeEn84wvKYnMP33oruunbP0S5+3/FrYxiWqV+O+bE4u6wml zLZXR15s8O+z3dq+YXnC0Yvp79hW+5yxXLPFoc6gyFNcODag90HKpNZTLQ/YlsW5N61fusb6 y6pL67Svu9/xZwlVvbJm0f9Vr/aEn3rp/VPsStwH33W3HnH85t0/eebhW53mbdJHo/sbj+X6 SDoqKBy41B0241bK49XOZ/k5jvbd/ps2f8rexeIcE4Jennj++/qiT/x++b9nTwnJCNJkOuJy lmPLpIfioSu1fjTvuztDa0tR0mE594kuMZ+zFQUrOqSvrzURqt80rU/1gGnsrefPbpl+UmIp zkg01GIuKk4EAKk+FXgKBAAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrHIsWRmVeSWpSXmKPExsWS2cDsrMuvb5lmsPyBjcXdxxfYLKZPvcBo ceJmI5vF6ptrGC1e/HnOZLH/6XMWi1ULr7FZnJ91isXi3pr/rBZn5x1ns9j3ei+zxY0JTxkt 7vc5WLQt2chkseBeO4vFrQnHmCzW71nA6iDosaHpDZvHzll32T0WbCr1aDnyltVj8Z6XTB6b VnWyeWz6NIndY/KN5YweU2fXe6zfcpXF4/MmuQDuKC6blNSczLLUIn27BK6MKZNZCq4IVPTs vsDWwHiZt4uRk0NCwERi4d857F2MXBxCAqsYJQ7fu80E4XxklJjUuIgZwlnKKPHvZDMjSAub gIHE7+MbwRIiAlfZJHZeO88G4jALLGaU6N/ymhWkSljAXGLepKtAVRxAVTYSn58LgIRFBPQk Zu75xgRiswioSDTd280IUsIr4CSx9KQESJhRQEzi+6k1YCXMAuISt57MZ4I4VUBiyZ7zzBC2 qMTLx/9YIWxFifvfX7JD1OtILNj9iQ3CtpM4sv4pVFxbYtnC12C9vAKCEidnPmGB6JWUOLji BssERrFZSNbNQjJqFpJRs5CMmoVk1AJG1lWM4qXFxbnpFcVGeanlesWJucWleel6yfm5mxiB SeT0v8PROxhv3/qod4iRiYPxEKMEB7OSCO/RdvM0Id6UxMqq1KL8+KLSnNTiQ4zSHCxK4rx3 H2ikCgmkJ5akZqemFqQWwWSZODilGpgytHgOxkbl/NCNOG25ZeL6h9943z11CqiK/B+ke6Vi o+OLNfWed/TsZv5dVml4TtC3br0J0z6RPbvfyefv2c2a3ntqiaLTj25/+UMr/BZLN5+VfjXt 9u3+cieDO+5tt6c8rN7r5ZH93TQy6dOcmBrZQ/0cH3TyL98vjxSS/8/eqSUpZ9W2La+H7Y7l kYe1r46IHxTTu357l+WLzJ7HK+2SbHTYPd8xG7e//3mtcNcrt4gPuilCsfuOW3o2Vs/el+l4 wjNY4tNaI6nJto2Wy6Us0xx4W2fzL17AFfBzcuXJKGPxWwo/2RWvX+TT8Qsx5X82U2fHweWz Z4WfLXSe0x3lZCvHkLHyn/Shaylpz5RYijMSDbWYi4oTAUH6bfORAwAA X-CMS-MailID: 20240506192712uscas1p225316f79bb69f979b647d2a06a00a25f CMS-TYPE: 301P X-CMS-RootMailID: 20240506192712uscas1p225316f79bb69f979b647d2a06a00a25f References: X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 74ACEA0005 X-Stat-Signature: 4dxrz8m8a4jyarpiihyona8cu63apys1 X-HE-Tag: 1715023634-191335 X-HE-Meta: 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 8gReX52t gHwS3F7xi0zYb7btqbQ8j5JGfp+5y/tCHcTJnIXfrWhkqL0USaLnwJqhacdCilUSzGJiS7pLRiNZ7QDkpdEh0tgasHw== 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: Hello all, I would like to have a discussion with the CXL development community about current outstanding issues and also invite developers interested in RAS and memory tiering to participate. The first topic I believe we should discuss is how we can ensure as a group that we are prioritizing upstream work. On a recent upstream CXL developmen= t discussion call there was a call to review more work. I apologize for not grabbing the link, but I believe Dave Jiang is leveraging patchwork and thi= s link should be shared with others so we can help get more reviews where nee= ded. The second topic I would like to discuss is how we integrate RAS features t= hat have similar equivalents in the kernel. A CXL device can provide info about= =20 memory media errors in a similar fashion to memory controllers that have ED= AC support. Discussions have been put on the list and I would like to hear tho= ughts from the community about where this should go [1]. On the same topic CXL ha= s=20 port level RAS features and the PCIe DW series touched on this issue [2] The third topic I would like to discuss is how we can get a set of common benchmarks for memory tiering evaluations. Our team has done some initial work in this space, but we want to hear more from end users about their=20 workloads of concern. There was a proposal related to this topic, but from = what=20 I understand no meeting has been held [3].=20 The last topic that I believe is worth discussion is how do we come up with a baseline for testing. I am aware of 3 efforts that could be used cxl_test= ,=20 qemu, and uunit testing framework [4]. Apologies for getting this out late, and please include anyone that may be interested in joining a discussion. [1] https://lore.kernel.org/linux-cxl/20240417075053.3273543-1-ruansy.fnst@= fujitsu.com/ [2] https://lore.kernel.org/lkml/20231130115044.53512-1-shradha.t@samsung.c= om/ [3] https://lore.kernel.org/all/2b29dd3d-bb2c-6a8c-94d2-d5c2e035516a@google= .com [4] https://lore.kernel.org/linux-cxl/170795677066.3697776.1258781271309390= 8173.stgit@ubuntu/