From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michal Nazarewicz Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support Date: Tue, 17 Oct 2017 15:22:39 +0200 Message-ID: References: <20171013084054.me3kxhgbxzgm2lpr@dhcp22.suse.cz> <20171013152801.nbpk6nluotgbmfrs@dhcp22.suse.cz> <20171013154747.2jv7rtfqyyagiodn@dhcp22.suse.cz> <20171013161736.htumyr4cskfrjq64@dhcp22.suse.cz> <752b49eb-55c6-5a34-ab41-6e91dd93ea70@mellanox.com> <20171016082456.no6ux63uy2rmj4fe@dhcp22.suse.cz> <0e238c56-c59d-f648-95fc-c8cb56c3652e@mellanox.com> <20171016123248.csntl6luxgafst6q@dhcp22.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Guy Shattah , Michal Hocko Cc: Christopher Lameter , Mike Kravetz , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , Marek Szyprowski , "Aneesh Kumar K . V" , Joonsoo Kim , Anshuman Khandual , Laura Abbott , Vlastimil Babka List-Id: linux-api@vger.kernel.org On Tue, Oct 17 2017, Guy Shattah wrote: > Are you going to be OK with kernel API which implements contiguous > memory allocation? Possibly with mmap style? Many drivers could > utilize it instead of having their own weird and possibly non-standard > way to allocate contiguous memory. Such API won't be available for > user space. What you describe sounds like CMA. It may be far from perfect but it=E2=80= =99s there already and drivers which need contiguous memory can allocate it. --=20 Best regards =E3=83=9F=E3=83=8F=E3=82=A6 =E2=80=9C=F0=9D=93=B6=F0=9D=93=B2=F0=9D=93=B7= =F0=9D=93=AA86=E2=80=9D =E3=83=8A=E3=82=B6=E3=83=AC=E3=83=B4=E3=82=A4=E3=83= =84 =C2=ABIf at first you don=E2=80=99t succeed, give up skydiving=C2=BB From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f198.google.com (mail-qt0-f198.google.com [209.85.216.198]) by kanga.kvack.org (Postfix) with ESMTP id C3E016B0253 for ; Tue, 17 Oct 2017 09:22:45 -0400 (EDT) Received: by mail-qt0-f198.google.com with SMTP id c36so1990006qtc.12 for ; Tue, 17 Oct 2017 06:22:45 -0700 (PDT) Received: from mail-sor-f41.google.com (mail-sor-f41.google.com. [209.85.220.41]) by mx.google.com with SMTPS id b76sor6063439qkj.110.2017.10.17.06.22.44 for (Google Transport Security); Tue, 17 Oct 2017 06:22:44 -0700 (PDT) From: Michal Nazarewicz Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support In-Reply-To: References: <20171013084054.me3kxhgbxzgm2lpr@dhcp22.suse.cz> <20171013152801.nbpk6nluotgbmfrs@dhcp22.suse.cz> <20171013154747.2jv7rtfqyyagiodn@dhcp22.suse.cz> <20171013161736.htumyr4cskfrjq64@dhcp22.suse.cz> <752b49eb-55c6-5a34-ab41-6e91dd93ea70@mellanox.com> <20171016082456.no6ux63uy2rmj4fe@dhcp22.suse.cz> <0e238c56-c59d-f648-95fc-c8cb56c3652e@mellanox.com> <20171016123248.csntl6luxgafst6q@dhcp22.suse.cz> Date: Tue, 17 Oct 2017 15:22:39 +0200 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org List-ID: To: Guy Shattah , Michal Hocko Cc: Christopher Lameter , Mike Kravetz , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , Marek Szyprowski , "Aneesh Kumar K . V" , Joonsoo Kim , Anshuman Khandual , Laura Abbott , Vlastimil Babka On Tue, Oct 17 2017, Guy Shattah wrote: > Are you going to be OK with kernel API which implements contiguous > memory allocation? Possibly with mmap style? Many drivers could > utilize it instead of having their own weird and possibly non-standard > way to allocate contiguous memory. Such API won't be available for > user space. What you describe sounds like CMA. It may be far from perfect but it=E2=80= =99s there already and drivers which need contiguous memory can allocate it. --=20 Best regards =E3=83=9F=E3=83=8F=E3=82=A6 =E2=80=9C=F0=9D=93=B6=F0=9D=93=B2=F0=9D=93=B7= =F0=9D=93=AA86=E2=80=9D =E3=83=8A=E3=82=B6=E3=83=AC=E3=83=B4=E3=82=A4=E3=83= =84 =C2=ABIf at first you don=E2=80=99t succeed, give up skydiving=C2=BB -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1762157AbdJQNWr (ORCPT ); Tue, 17 Oct 2017 09:22:47 -0400 Received: from mail-qk0-f176.google.com ([209.85.220.176]:50944 "EHLO mail-qk0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758425AbdJQNWo (ORCPT ); Tue, 17 Oct 2017 09:22:44 -0400 X-Google-Smtp-Source: ABhQp+Rg+5ohST9EKgJMggLTn4xsl/UYLRJoD6EDYIv7HYFyad48xJpnVPXV7P8Rdw37SXhPnZfnUw== From: Michal Nazarewicz To: Guy Shattah , Michal Hocko Cc: Christopher Lameter , Mike Kravetz , "linux-mm\@kvack.org" , "linux-kernel\@vger.kernel.org" , "linux-api\@vger.kernel.org" , Marek Szyprowski , "Aneesh Kumar K . V" , Joonsoo Kim , Anshuman Khandual , Laura Abbott , Vlastimil Babka Subject: Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support In-Reply-To: Organization: http://mina86.com/ References: <20171013084054.me3kxhgbxzgm2lpr@dhcp22.suse.cz> <20171013152801.nbpk6nluotgbmfrs@dhcp22.suse.cz> <20171013154747.2jv7rtfqyyagiodn@dhcp22.suse.cz> <20171013161736.htumyr4cskfrjq64@dhcp22.suse.cz> <752b49eb-55c6-5a34-ab41-6e91dd93ea70@mellanox.com> <20171016082456.no6ux63uy2rmj4fe@dhcp22.suse.cz> <0e238c56-c59d-f648-95fc-c8cb56c3652e@mellanox.com> <20171016123248.csntl6luxgafst6q@dhcp22.suse.cz> Face: 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 X-Face: -TR8(rDTHy/(xl?SfWd1|3:TTgDIatE^t'vop%*gVg[kn$t{EpK(P"VQ=~T2#ysNmJKN$"yTRLB4YQs$4{[.]Fc1)*O]3+XO^oXM>Q#b^ix,O)Zbn)q[y06$`e3?C)`CwR9y5riE=fv^X@x$y?D:XO6L&x4f-}}I4=VRNwiA^t1-ZrVK^07.Pi/57c_du'& OpenPGP: id=AC1F5F5CD41888F8CC8458582060401250751FF4; url=http://mina86.com/mina86.pub X-Hashcash: 1:20:171017:khandual@linux.vnet.ibm.com::i75yCvrbwUzSAK3m:00000000000000000000000000000000000Yg2 X-Hashcash: 1:20:171017:aneesh.kumar@linux.vnet.ibm.com::ln4XnOwoWk0y3xed:00000000000000000000000000000018jc X-Hashcash: 1:20:171017:linux-api@vger.kernel.org::aZrnWAVEJUoGcoYp:0000000000000000000000000000000000001QC+ X-Hashcash: 1:20:171017:cl@linux.com::VVKJh97R7T66Qp+J:000001tP+ X-Hashcash: 1:20:171017:mhocko@kernel.org::bdcWs3yiDnYbNOgT:0000000000000000000000000000000000000000000018aH X-Hashcash: 1:20:171017:sguy@mellanox.com::S2UIgZ3JQ7o1Vrd1:000000000000000000000000000000000000000000000HLd X-Hashcash: 1:20:171017:linux-kernel@vger.kernel.org::2D/Hc73JhhYlX+e4:0000000000000000000000000000000003+kr X-Hashcash: 1:20:171017:labbott@redhat.com::xjLkUSct5SVvg+Gq:00000000000000000000000000000000000000000002/4S X-Hashcash: 1:20:171017:m.szyprowski@samsung.com::jrNJxR4xerTlu3lz:00000000000000000000000000000000000004Wpr X-Hashcash: 1:20:171017:mike.kravetz@oracle.com::6ILzL9Z800wA4RMf:000000000000000000000000000000000000006CoK X-Hashcash: 1:20:171017:vbabka@suse.cz::p0OV91t4jcEsPQSH:0005nlh X-Hashcash: 1:20:171017:linux-mm@kvack.org::K7ROT5+XyJIfWuP5:00000000000000000000000000000000000000000008PUx X-Hashcash: 1:20:171017:iamjoonsoo.kim@lge.com::iqMVY4SJjV0KmEdz:0000000000000000000000000000000000000006udr Date: Tue, 17 Oct 2017 15:22:39 +0200 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id v9HDMrK9020503 On Tue, Oct 17 2017, Guy Shattah wrote: > Are you going to be OK with kernel API which implements contiguous > memory allocation? Possibly with mmap style? Many drivers could > utilize it instead of having their own weird and possibly non-standard > way to allocate contiguous memory. Such API won't be available for > user space. What you describe sounds like CMA. It may be far from perfect but it’s there already and drivers which need contiguous memory can allocate it. -- Best regards ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ «If at first you don’t succeed, give up skydiving»