From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-dev-return-7572-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [10.110.1.242]) by lists.oasis-open.org (Postfix) with ESMTP id 81EB598607B for ; Thu, 16 Jul 2020 10:45:13 +0000 (UTC) Date: Thu, 16 Jul 2020 06:45:00 -0400 From: "Michael S. Tsirkin" Message-ID: <20200716064340-mutt-send-email-mst@kernel.org> References: <1594867315-8626-1-git-send-email-teawater@gmail.com> <20200716021929-mutt-send-email-mst@kernel.org> <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> MIME-Version: 1.0 In-Reply-To: <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> Subject: Re: [virtio-dev] [RFC for Linux v4 0/2] virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES to report continuous pages Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline To: teawater Cc: Hui Zhu , david@redhat.com, jasowang@redhat.com, akpm@linux-foundation.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, Andrea Arcangeli List-ID: On Thu, Jul 16, 2020 at 03:01:18PM +0800, teawater wrote: >=20 >=20 > > 2020=E5=B9=B47=E6=9C=8816=E6=97=A5 14:38=EF=BC=8CMichael S. Tsirkin =E5=86=99=E9=81=93=EF=BC=9A > >=20 > > On Thu, Jul 16, 2020 at 10:41:50AM +0800, Hui Zhu wrote: > >> The first, second and third version are in [1], [2] and [3]. > >> Code of current version for Linux and qemu is available in [4] and [5]= . > >> Update of this version: > >> 1. Report continuous pages will increase the speed. So added deflate > >> continuous pages. > >> 2. According to the comments from David in [6], added 2 new vqs inflat= e_cont_vq > >> and deflate_cont_vq to report continuous pages with format 32 bits p= fn and 32 > >> bits size. > >> Following is the introduction of the function. > >> These patches add VIRTIO_BALLOON_F_CONT_PAGES to virtio_balloon. With = this > >> flag, balloon tries to use continuous pages to inflate and deflate. > >> Opening this flag can bring two benefits: > >> 1. Report continuous pages will increase memory report size of each ti= me > >> call tell_host. Then it will increase the speed of balloon inflate = and > >> deflate. > >> 2. Host THPs will be splitted when qemu release the page of balloon in= flate. > >> Inflate balloon with continuous pages will let QEMU release the page= s > >> of same THPs. That will help decrease the splitted THPs number in > >> the host. > >> Following is an example in a VM with 1G memory 1CPU. This test setu= ps an > >> environment that has a lot of fragmentation pages. Then inflate bal= loon will > >> split the THPs. >=20 >=20 > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. >=20 > >> // After VM start, use usemem > >> // (https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability= .git) > >> // punch-holes function generates 400m fragmentation pages in the gues= t > >> // kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot o= f fragmentation pages. >=20 > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. >=20 > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M= . > >> (qemu) device_add virtio-balloon-pci,id=3Dballoon1 > >> (qemu) info balloon > >> balloon: actual=3D1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=3D600 > These lines are from host. >=20 > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 88064 kB > These lines are from host. >=20 > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=3D1024 > These lines are from host. >=20 > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. >=20 > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 65536 kB > These lines are from host. >=20 >=20 >=20 > >>=20 > >> Following example change to use continuous pages balloon. The number = of > >> splitted THPs is decreased. > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. >=20 > >> // After VM start, use usemem punch-holes function generates 400M > >> // fragmentation pages in the guest kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot o= f fragmentation pages. >=20 > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. >=20 > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M= . > >> (qemu) device_add virtio-balloon-pci,id=3Dballoon1,cont-pages=3Don > >> (qemu) info balloon > >> balloon: actual=3D1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=3D600 > These lines are from host. >=20 > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 616448 kB > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=3D1024 > These lines are from host. >=20 > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. >=20 > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 907264 kB > These lines are from host. >=20 > >=20 > > I'm a bit confused about which of the above run within guest, > > and which run within host. Could you explain pls? > >=20 > >=20 >=20 > I added some introduction to show where these lines is get from. >=20 > Best, > Hui OK so we see host has more free THPs. But guest has presumably less now - s= o the total page table depth is the same. Did we gain anything? >=20 > >=20 > >> [1] https://lkml.org/lkml/2020/3/12/144 > >> [2] https://lore.kernel.org/linux-mm/1584893097-12317-1-git-send-email= -teawater@gmail.com/ > >> [3] https://lkml.org/lkml/2020/5/12/324 > >> [4] https://github.com/teawater/linux/tree/balloon_conts > >> [5] https://github.com/teawater/qemu/tree/balloon_conts > >> [6] https://lkml.org/lkml/2020/5/13/1211 > >>=20 > >> Hui Zhu (2): > >> virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES and inflate_cont_vq > >> virtio_balloon: Add deflate_cont_vq to deflate continuous pages > >>=20 > >> drivers/virtio/virtio_balloon.c | 180 +++++++++++++++++++++++++++= ++++----- > >> include/linux/balloon_compaction.h | 12 ++ > >> include/uapi/linux/virtio_balloon.h | 1 > >> mm/balloon_compaction.c | 117 +++++++++++++++++++++-- > >> 4 files changed, 280 insertions(+), 30 deletions(-) > >=20 > >=20 > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org > > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [RFC for Linux v4 0/2] virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES to report continuous pages Date: Thu, 16 Jul 2020 06:45:00 -0400 Message-ID: <20200716064340-mutt-send-email-mst@kernel.org> References: <1594867315-8626-1-git-send-email-teawater@gmail.com> <20200716021929-mutt-send-email-mst@kernel.org> <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: In-Reply-To: <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> Content-Disposition: inline To: teawater Cc: Hui Zhu , david@redhat.com, jasowang@redhat.com, akpm@linux-foundation.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, Andrea Arcangeli List-Id: virtualization@lists.linuxfoundation.org On Thu, Jul 16, 2020 at 03:01:18PM +0800, teawater wrote: > > > > 2020年7月16日 14:38，Michael S. Tsirkin 写道： > > > > On Thu, Jul 16, 2020 at 10:41:50AM +0800, Hui Zhu wrote: > >> The first, second and third version are in [1], [2] and [3]. > >> Code of current version for Linux and qemu is available in [4] and [5]. > >> Update of this version: > >> 1. Report continuous pages will increase the speed. So added deflate > >> continuous pages. > >> 2. According to the comments from David in [6], added 2 new vqs inflate_cont_vq > >> and deflate_cont_vq to report continuous pages with format 32 bits pfn and 32 > >> bits size. > >> Following is the introduction of the function. > >> These patches add VIRTIO_BALLOON_F_CONT_PAGES to virtio_balloon. With this > >> flag, balloon tries to use continuous pages to inflate and deflate. > >> Opening this flag can bring two benefits: > >> 1. Report continuous pages will increase memory report size of each time > >> call tell_host. Then it will increase the speed of balloon inflate and > >> deflate. > >> 2. Host THPs will be splitted when qemu release the page of balloon inflate. > >> Inflate balloon with continuous pages will let QEMU release the pages > >> of same THPs. That will help decrease the splitted THPs number in > >> the host. > >> Following is an example in a VM with 1G memory 1CPU. This test setups an > >> environment that has a lot of fragmentation pages. Then inflate balloon will > >> split the THPs. > > > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. > > >> // After VM start, use usemem > >> // (https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git) > >> // punch-holes function generates 400m fragmentation pages in the guest > >> // kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot of fragmentation pages. > > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. > > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M. > >> (qemu) device_add virtio-balloon-pci,id=balloon1 > >> (qemu) info balloon > >> balloon: actual=1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=600 > These lines are from host. > > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 88064 kB > These lines are from host. > > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=1024 > These lines are from host. > > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. > > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 65536 kB > These lines are from host. > > > > >> > >> Following example change to use continuous pages balloon. The number of > >> splitted THPs is decreased. > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. > > >> // After VM start, use usemem punch-holes function generates 400M > >> // fragmentation pages in the guest kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot of fragmentation pages. > > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. > > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M. > >> (qemu) device_add virtio-balloon-pci,id=balloon1,cont-pages=on > >> (qemu) info balloon > >> balloon: actual=1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=600 > These lines are from host. > > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 616448 kB > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=1024 > These lines are from host. > > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. > > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 907264 kB > These lines are from host. > > > > > I'm a bit confused about which of the above run within guest, > > and which run within host. Could you explain pls? > > > > > > I added some introduction to show where these lines is get from. > > Best, > Hui OK so we see host has more free THPs. But guest has presumably less now - so the total page table depth is the same. Did we gain anything? > > > > >> [1] https://lkml.org/lkml/2020/3/12/144 > >> [2] https://lore.kernel.org/linux-mm/1584893097-12317-1-git-send-email-teawater@gmail.com/ > >> [3] https://lkml.org/lkml/2020/5/12/324 > >> [4] https://github.com/teawater/linux/tree/balloon_conts > >> [5] https://github.com/teawater/qemu/tree/balloon_conts > >> [6] https://lkml.org/lkml/2020/5/13/1211 > >> > >> Hui Zhu (2): > >> virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES and inflate_cont_vq > >> virtio_balloon: Add deflate_cont_vq to deflate continuous pages > >> > >> drivers/virtio/virtio_balloon.c | 180 +++++++++++++++++++++++++++++++----- > >> include/linux/balloon_compaction.h | 12 ++ > >> include/uapi/linux/virtio_balloon.h | 1 > >> mm/balloon_compaction.c | 117 +++++++++++++++++++++-- > >> 4 files changed, 280 insertions(+), 30 deletions(-) > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org > > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org 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 X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AAEBDC433E3 for ; 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[79.182.31.92]) by smtp.gmail.com with ESMTPSA id w128sm8996937wmb.19.2020.07.16.03.45.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2020 03:45:04 -0700 (PDT) Date: Thu, 16 Jul 2020 06:45:00 -0400 From: "Michael S. Tsirkin" To: teawater Cc: Hui Zhu , david@redhat.com, jasowang@redhat.com, akpm@linux-foundation.org, virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, qemu-devel@nongnu.org, virtio-dev@lists.oasis-open.org, Andrea Arcangeli Subject: Re: [virtio-dev] [RFC for Linux v4 0/2] virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES to report continuous pages Message-ID: <20200716064340-mutt-send-email-mst@kernel.org> References: <1594867315-8626-1-git-send-email-teawater@gmail.com> <20200716021929-mutt-send-email-mst@kernel.org> <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> MIME-Version: 1.0 In-Reply-To: <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline X-Rspamd-Queue-Id: AD3D31814B0C8 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 Content-Transfer-Encoding: quoted-printable 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 Thu, Jul 16, 2020 at 03:01:18PM +0800, teawater wrote: >=20 >=20 > > 2020=E5=B9=B47=E6=9C=8816=E6=97=A5 14:38=EF=BC=8CMichael S. Tsirkin <= mst@redhat.com> =E5=86=99=E9=81=93=EF=BC=9A > >=20 > > On Thu, Jul 16, 2020 at 10:41:50AM +0800, Hui Zhu wrote: > >> The first, second and third version are in [1], [2] and [3]. > >> Code of current version for Linux and qemu is available in [4] and [= 5]. > >> Update of this version: > >> 1. Report continuous pages will increase the speed. So added deflat= e > >> continuous pages. > >> 2. According to the comments from David in [6], added 2 new vqs infl= ate_cont_vq > >> and deflate_cont_vq to report continuous pages with format 32 bits= pfn and 32 > >> bits size. > >> Following is the introduction of the function. > >> These patches add VIRTIO_BALLOON_F_CONT_PAGES to virtio_balloon. Wit= h this > >> flag, balloon tries to use continuous pages to inflate and deflate. > >> Opening this flag can bring two benefits: > >> 1. Report continuous pages will increase memory report size of each = time > >> call tell_host. Then it will increase the speed of balloon inflat= e and > >> deflate. > >> 2. Host THPs will be splitted when qemu release the page of balloon = inflate. > >> Inflate balloon with continuous pages will let QEMU release the pa= ges > >> of same THPs. That will help decrease the splitted THPs number in > >> the host. > >> Following is an example in a VM with 1G memory 1CPU. This test se= tups an > >> environment that has a lot of fragmentation pages. Then inflate b= alloon will > >> split the THPs. >=20 >=20 > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. >=20 > >> // After VM start, use usemem > >> // (https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalabili= ty.git) > >> // punch-holes function generates 400m fragmentation pages in the gu= est > >> // kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot= of fragmentation pages. >=20 > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. >=20 > >> // Connect to the QEMU monitor, setup balloon, and set it size to 60= 0M. > >> (qemu) device_add virtio-balloon-pci,id=3Dballoon1 > >> (qemu) info balloon > >> balloon: actual=3D1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=3D600 > These lines are from host. >=20 > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 88064 kB > These lines are from host. >=20 > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=3D1024 > These lines are from host. >=20 > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. >=20 > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 65536 kB > These lines are from host. >=20 >=20 >=20 > >>=20 > >> Following example change to use continuous pages balloon. The numbe= r of > >> splitted THPs is decreased. > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. >=20 > >> // After VM start, use usemem punch-holes function generates 400M > >> // fragmentation pages in the guest kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot= of fragmentation pages. >=20 > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. >=20 > >> // Connect to the QEMU monitor, setup balloon, and set it size to 60= 0M. > >> (qemu) device_add virtio-balloon-pci,id=3Dballoon1,cont-pages=3Don > >> (qemu) info balloon > >> balloon: actual=3D1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=3D600 > These lines are from host. >=20 > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 616448 kB > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=3D1024 > These lines are from host. >=20 > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. >=20 > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 907264 kB > These lines are from host. >=20 > >=20 > > I'm a bit confused about which of the above run within guest, > > and which run within host. Could you explain pls? > >=20 > >=20 >=20 > I added some introduction to show where these lines is get from. >=20 > Best, > Hui OK so we see host has more free THPs. But guest has presumably less now -= so the total page table depth is the same. Did we gain anything? >=20 > >=20 > >> [1] https://lkml.org/lkml/2020/3/12/144 > >> [2] https://lore.kernel.org/linux-mm/1584893097-12317-1-git-send-ema= il-teawater@gmail.com/ > >> [3] https://lkml.org/lkml/2020/5/12/324 > >> [4] https://github.com/teawater/linux/tree/balloon_conts > >> [5] https://github.com/teawater/qemu/tree/balloon_conts > >> [6] https://lkml.org/lkml/2020/5/13/1211 > >>=20 > >> Hui Zhu (2): > >> virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES and inflate_cont_vq > >> virtio_balloon: Add deflate_cont_vq to deflate continuous pages > >>=20 > >> drivers/virtio/virtio_balloon.c | 180 +++++++++++++++++++++++++= ++++++----- > >> include/linux/balloon_compaction.h | 12 ++ > >> include/uapi/linux/virtio_balloon.h | 1 > >> mm/balloon_compaction.c | 117 +++++++++++++++++++++-- > >> 4 files changed, 280 insertions(+), 30 deletions(-) > >=20 > >=20 > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org > > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org 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 X-Spam-Level: X-Spam-Status: No, score=-8.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A25EDC433E0 for ; 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[79.182.31.92]) by smtp.gmail.com with ESMTPSA id w128sm8996937wmb.19.2020.07.16.03.45.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2020 03:45:04 -0700 (PDT) Date: Thu, 16 Jul 2020 06:45:00 -0400 From: "Michael S. Tsirkin" To: teawater Subject: Re: [virtio-dev] [RFC for Linux v4 0/2] virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES to report continuous pages Message-ID: <20200716064340-mutt-send-email-mst@kernel.org> References: <1594867315-8626-1-git-send-email-teawater@gmail.com> <20200716021929-mutt-send-email-mst@kernel.org> <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> MIME-Version: 1.0 In-Reply-To: <744230FA-78D8-4568-8188-683087065E84@linux.alibaba.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Disposition: inline Received-SPF: pass client-ip=205.139.110.120; envelope-from=mst@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/15 19:36:06 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrea Arcangeli , virtio-dev@lists.oasis-open.org, david@redhat.com, qemu-devel@nongnu.org, jasowang@redhat.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-mm@kvack.org, akpm@linux-foundation.org, Hui Zhu Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Jul 16, 2020 at 03:01:18PM +0800, teawater wrote: > > > > 2020年7月16日 14:38，Michael S. Tsirkin 写道： > > > > On Thu, Jul 16, 2020 at 10:41:50AM +0800, Hui Zhu wrote: > >> The first, second and third version are in [1], [2] and [3]. > >> Code of current version for Linux and qemu is available in [4] and [5]. > >> Update of this version: > >> 1. Report continuous pages will increase the speed. So added deflate > >> continuous pages. > >> 2. According to the comments from David in [6], added 2 new vqs inflate_cont_vq > >> and deflate_cont_vq to report continuous pages with format 32 bits pfn and 32 > >> bits size. > >> Following is the introduction of the function. > >> These patches add VIRTIO_BALLOON_F_CONT_PAGES to virtio_balloon. With this > >> flag, balloon tries to use continuous pages to inflate and deflate. > >> Opening this flag can bring two benefits: > >> 1. Report continuous pages will increase memory report size of each time > >> call tell_host. Then it will increase the speed of balloon inflate and > >> deflate. > >> 2. Host THPs will be splitted when qemu release the page of balloon inflate. > >> Inflate balloon with continuous pages will let QEMU release the pages > >> of same THPs. That will help decrease the splitted THPs number in > >> the host. > >> Following is an example in a VM with 1G memory 1CPU. This test setups an > >> environment that has a lot of fragmentation pages. Then inflate balloon will > >> split the THPs. > > > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. > > >> // After VM start, use usemem > >> // (https://git.kernel.org/pub/scm/linux/kernel/git/wfg/vm-scalability.git) > >> // punch-holes function generates 400m fragmentation pages in the guest > >> // kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot of fragmentation pages. > > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. > > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M. > >> (qemu) device_add virtio-balloon-pci,id=balloon1 > >> (qemu) info balloon > >> balloon: actual=1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=600 > These lines are from host. > > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 88064 kB > These lines are from host. > > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=1024 > These lines are from host. > > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. > > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 65536 kB > These lines are from host. > > > > >> > >> Following example change to use continuous pages balloon. The number of > >> splitted THPs is decreased. > >> // This is the THP number before VM execution in the host. > >> // None use THP. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 0 kB > These lines are from host. > > >> // After VM start, use usemem punch-holes function generates 400M > >> // fragmentation pages in the guest kernel. > >> usemem --punch-holes -s -1 800m & > These lines are from guest. They setups the environment that has a lot of fragmentation pages. > > >> // This is the THP number after this command in the host. > >> // Some THP is used by VM because usemem will access 800M memory > >> // in the guest. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 911360 kB > These lines are from host. > > >> // Connect to the QEMU monitor, setup balloon, and set it size to 600M. > >> (qemu) device_add virtio-balloon-pci,id=balloon1,cont-pages=on > >> (qemu) info balloon > >> balloon: actual=1024 > >> (qemu) balloon 600 > >> (qemu) info balloon > >> balloon: actual=600 > These lines are from host. > > >> // This is the THP number after inflate the balloon in the host. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 616448 kB > >> // Set the size back to 1024M in the QEMU monitor. > >> (qemu) balloon 1024 > >> (qemu) info balloon > >> balloon: actual=1024 > These lines are from host. > > >> // Use usemem to increase the memory usage of QEMU. > >> killall usemem > >> usemem 800m > These lines are from guest. > > >> // This is the THP number after this operation. > >> cat /proc/meminfo | grep AnonHugePages: > >> AnonHugePages: 907264 kB > These lines are from host. > > > > > I'm a bit confused about which of the above run within guest, > > and which run within host. Could you explain pls? > > > > > > I added some introduction to show where these lines is get from. > > Best, > Hui OK so we see host has more free THPs. But guest has presumably less now - so the total page table depth is the same. Did we gain anything? > > > > >> [1] https://lkml.org/lkml/2020/3/12/144 > >> [2] https://lore.kernel.org/linux-mm/1584893097-12317-1-git-send-email-teawater@gmail.com/ > >> [3] https://lkml.org/lkml/2020/5/12/324 > >> [4] https://github.com/teawater/linux/tree/balloon_conts > >> [5] https://github.com/teawater/qemu/tree/balloon_conts > >> [6] https://lkml.org/lkml/2020/5/13/1211 > >> > >> Hui Zhu (2): > >> virtio_balloon: Add VIRTIO_BALLOON_F_CONT_PAGES and inflate_cont_vq > >> virtio_balloon: Add deflate_cont_vq to deflate continuous pages > >> > >> drivers/virtio/virtio_balloon.c | 180 +++++++++++++++++++++++++++++++----- > >> include/linux/balloon_compaction.h | 12 ++ > >> include/uapi/linux/virtio_balloon.h | 1 > >> mm/balloon_compaction.c | 117 +++++++++++++++++++++-- > >> 4 files changed, 280 insertions(+), 30 deletions(-) > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org > > For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org