From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f178.google.com (mail-pf0-f178.google.com [209.85.192.178]) by kanga.kvack.org (Postfix) with ESMTP id 10B846B0005 for ; Tue, 2 Feb 2016 19:41:03 -0500 (EST) Received: by mail-pf0-f178.google.com with SMTP id n128so3210240pfn.3 for ; Tue, 02 Feb 2016 16:41:03 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [2001:1868:205::9]) by mx.google.com with ESMTPS id v16si5094613pfa.129.2016.02.02.16.41.01 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 02 Feb 2016 16:41:02 -0800 (PST) Message-ID: <1454460057.4788.117.camel@infradead.org> Subject: Re: [LSF/MM ATTEND] HMM (heterogeneous memory manager) and GPU From: David Woodhouse Date: Wed, 03 Feb 2016 00:40:57 +0000 In-Reply-To: <20160128175536.GA20797@gmail.com> References: <20160128175536.GA20797@gmail.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-ZMKB05rXY+bxHZZBUqO0" Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Jerome Glisse , lsf-pc@lists.linux-foundation.org, "linux-mm@kvack.org" Cc: joro@8bytes.org --=-ZMKB05rXY+bxHZZBUqO0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2016-01-28 at 18:55 +0100, Jerome Glisse wrote: >=20 > I would like to attend LSF/MM this year to discuss about HMM > (Heterogeneous Memory Manager) and more generaly all topics > related to GPU and heterogeneous memory architecture (including > persistent memory). >=20 > I want to discuss how to move forward with HMM merging and i > hope that by MM summit time i will be able to share more > informations publicly on devices which rely on HMM. There are a few related issues here around Shared Virtual Memory, and lifetime management of the associated MM, and the proposal discussed at the Kernel Summit for "off-CPU tasks". I've hit a situation with the Intel SVM code in 4.4 where the device driver binds a PASID, and also has mmap() functionality on the same file descriptor that the PASID is associated with. So on process exit, the MM doesn't die because the PASID binding still exists. The VMA of the mmap doesn't die because the MM still exists. So the underlying file remains open because the VMA still exists. And the PASID binding thus doesn't die because the file is still open. I've posted a patch=C2=B9 which moves us closer to the amd_iommu_v2 model, although I'm still *strongly* resisting the temptation to call out into device driver code from the mmu_notifier's release callback. I would like to attend LSF/MM this year so we can continue to work on those issues =E2=80=94 now that we actually have some hardware in the field= and a better idea of how we can build a unified access model for SVM across the different IOMMU types. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation =C2=B9 http://www.spinics.net/lists/linux-mm/msg100230.html --=-ZMKB05rXY+bxHZZBUqO0 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk 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