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[209.132.183.28]) by mx.google.com with ESMTPS id l29si1350681qtb.91.2019.03.06.10.07.54 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Mar 2019 10:07:54 -0800 (PST) Received-SPF: pass (google.com: domain of nitesh@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of nitesh@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=nitesh@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3F5683092658; Wed, 6 Mar 2019 18:07:53 +0000 (UTC) Received: from [10.18.17.32] (dhcp-17-32.bos.redhat.com [10.18.17.32]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 91CACA4F84; Wed, 6 Mar 2019 18:07:51 +0000 (UTC) Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com, david@redhat.com, dodgen@google.com, konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com, alexander.duyck@gmail.com References: <20190306155048.12868-1-nitesh@redhat.com> <20190306110501-mutt-send-email-mst@kernel.org> From: Nitesh Narayan Lal Openpgp: preference=signencrypt Autocrypt: addr=nitesh@redhat.com; prefer-encrypt=mutual; keydata= mQINBFl4pQoBEADT/nXR2JOfsCjDgYmE2qonSGjkM1g8S6p9UWD+bf7YEAYYYzZsLtbilFTe z4nL4AV6VJmC7dBIlTi3Mj2eymD/2dkKP6UXlliWkq67feVg1KG+4UIp89lFW7v5Y8Muw3Fm uQbFvxyhN8n3tmhRe+ScWsndSBDxYOZgkbCSIfNPdZrHcnOLfA7xMJZeRCjqUpwhIjxQdFA7 n0s0KZ2cHIsemtBM8b2WXSQG9CjqAJHVkDhrBWKThDRF7k80oiJdEQlTEiVhaEDURXq+2XmG jpCnvRQDb28EJSsQlNEAzwzHMeplddfB0vCg9fRk/kOBMDBtGsTvNT9OYUZD+7jaf0gvBvBB lbKmmMMX7uJB+ejY7bnw6ePNrVPErWyfHzR5WYrIFUtgoR3LigKnw5apzc7UIV9G8uiIcZEn C+QJCK43jgnkPcSmwVPztcrkbC84g1K5v2Dxh9amXKLBA1/i+CAY8JWMTepsFohIFMXNLj+B RJoOcR4HGYXZ6CAJa3Glu3mCmYqHTOKwezJTAvmsCLd3W7WxOGF8BbBjVaPjcZfavOvkin0u DaFvhAmrzN6lL0msY17JCZo046z8oAqkyvEflFbC0S1R/POzehKrzQ1RFRD3/YzzlhmIowkM BpTqNBeHEzQAlIhQuyu1ugmQtfsYYq6FPmWMRfFPes/4JUU/PQARAQABtCVOaXRlc2ggTmFy YXlhbiBMYWwgPG5pbGFsQHJlZGhhdC5jb20+iQI9BBMBCAAnBQJZeKUKAhsjBQkJZgGABQsJ CAcCBhUICQoLAgQWAgMBAh4BAheAAAoJEKOGQNwGMqM56lEP/A2KMs/pu0URcVk/kqVwcBhU SnvB8DP3lDWDnmVrAkFEOnPX7GTbactQ41wF/xwjwmEmTzLrMRZpkqz2y9mV0hWHjqoXbOCS 6RwK3ri5e2ThIPoGxFLt6TrMHgCRwm8YuOSJ97o+uohCTN8pmQ86KMUrDNwMqRkeTRW9wWIQ EdDqW44VwelnyPwcmWHBNNb1Kd8j3xKlHtnS45vc6WuoKxYRBTQOwI/5uFpDZtZ1a5kq9Ak/ MOPDDZpd84rqd+IvgMw5z4a5QlkvOTpScD21G3gjmtTEtyfahltyDK/5i8IaQC3YiXJCrqxE r7/4JMZeOYiKpE9iZMtS90t4wBgbVTqAGH1nE/ifZVAUcCtycD0f3egX9CHe45Ad4fsF3edQ ESa5tZAogiA4Hc/yQpnnf43a3aQ67XPOJXxS0Qptzu4vfF9h7kTKYWSrVesOU3QKYbjEAf95 NewF9FhAlYqYrwIwnuAZ8TdXVDYt7Z3z506//sf6zoRwYIDA8RDqFGRuPMXUsoUnf/KKPrtR ceLcSUP/JCNiYbf1/QtW8S6Ca/4qJFXQHp0knqJPGmwuFHsarSdpvZQ9qpxD3FnuPyo64S2N Dfq8TAeifNp2pAmPY2PAHQ3nOmKgMG8Gn5QiORvMUGzSz8Lo31LW58NdBKbh6bci5+t/HE0H pnyVf5xhNC/FuQINBFl4pQoBEACr+MgxWHUP76oNNYjRiNDhaIVtnPRqxiZ9v4H5FPxJy9UD Bqr54rifr1E+K+yYNPt/Po43vVL2cAyfyI/LVLlhiY4yH6T1n+Di/hSkkviCaf13gczuvgz4 KVYLwojU8+naJUsiCJw01MjO3pg9GQ+47HgsnRjCdNmmHiUQqksMIfd8k3reO9SUNlEmDDNB XuSzkHjE5y/R/6p8uXaVpiKPfHoULjNRWaFc3d2JGmxJpBdpYnajoz61m7XJlgwl/B5Ql/6B dHGaX3VHxOZsfRfugwYF9CkrPbyO5PK7yJ5vaiWre7aQ9bmCtXAomvF1q3/qRwZp77k6i9R3 tWfXjZDOQokw0u6d6DYJ0Vkfcwheg2i/Mf/epQl7Pf846G3PgSnyVK6cRwerBl5a68w7xqVU 4KgAh0DePjtDcbcXsKRT9D63cfyfrNE+ea4i0SVik6+N4nAj1HbzWHTk2KIxTsJXypibOKFX 2VykltxutR1sUfZBYMkfU4PogE7NjVEU7KtuCOSAkYzIWrZNEQrxYkxHLJsWruhSYNRsqVBy KvY6JAsq/i5yhVd5JKKU8wIOgSwC9P6mXYRgwPyfg15GZpnw+Fpey4bCDkT5fMOaCcS+vSU1 UaFmC4Ogzpe2BW2DOaPU5Ik99zUFNn6cRmOOXArrryjFlLT5oSOe4IposgWzdwARAQABiQIl BBgBCAAPBQJZeKUKAhsMBQkJZgGAAAoJEKOGQNwGMqM5ELoP/jj9d9gF1Al4+9bngUlYohYu 0sxyZo9IZ7Yb7cHuJzOMqfgoP4tydP4QCuyd9Q2OHHL5AL4VFNb8SvqAxxYSPuDJTI3JZwI7 d8JTPKwpulMSUaJE8ZH9n8A/+sdC3CAD4QafVBcCcbFe1jifHmQRdDrvHV9Es14QVAOTZhnJ vweENyHEIxkpLsyUUDuVypIo6y/Cws+EBCWt27BJi9GH/EOTB0wb+2ghCs/i3h8a+bi+bS7L FCCm/AxIqxRurh2UySn0P/2+2eZvneJ1/uTgfxnjeSlwQJ1BWzMAdAHQO1/lnbyZgEZEtUZJ x9d9ASekTtJjBMKJXAw7GbB2dAA/QmbA+Q+Xuamzm/1imigz6L6sOt2n/X/SSc33w8RJUyor SvAIoG/zU2Y76pKTgbpQqMDmkmNYFMLcAukpvC4ki3Sf086TdMgkjqtnpTkEElMSFJC8npXv 3QnGGOIfFug/qs8z03DLPBz9VYS26jiiN7QIJVpeeEdN/LKnaz5LO+h5kNAyj44qdF2T2AiF HxnZnxO5JNP5uISQH3FjxxGxJkdJ8jKzZV7aT37sC+Rp0o3KNc+GXTR+GSVq87Xfuhx0LRST NK9ZhT0+qkiN7npFLtNtbzwqaqceq3XhafmCiw8xrtzCnlB/C4SiBr/93Ip4kihXJ0EuHSLn VujM7c/b4pps Organization: Red Hat Inc, Message-ID: Date: Wed, 6 Mar 2019 13:07:50 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190306110501-mutt-send-email-mst@kernel.org> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="JxYzMsx6no2b159rO7jMVpujrTFgIS6rJ" X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Wed, 06 Mar 2019 18:07:53 +0000 (UTC) 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: This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --JxYzMsx6no2b159rO7jMVpujrTFgIS6rJ Content-Type: multipart/mixed; boundary="gsK4cdQ2SmPsmm3JcrDh3layyISQw5H9P"; protected-headers="v1" From: Nitesh Narayan Lal To: "Michael S. Tsirkin" Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com, david@redhat.com, dodgen@google.com, konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com, alexander.duyck@gmail.com Message-ID: Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting References: <20190306155048.12868-1-nitesh@redhat.com> <20190306110501-mutt-send-email-mst@kernel.org> In-Reply-To: <20190306110501-mutt-send-email-mst@kernel.org> --gsK4cdQ2SmPsmm3JcrDh3layyISQw5H9P Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 3/6/19 11:09 AM, Michael S. Tsirkin wrote: > On Wed, Mar 06, 2019 at 10:50:42AM -0500, Nitesh Narayan Lal wrote: >> The following patch-set proposes an efficient mechanism for handing fr= eed memory between the guest and the host. It enables the guests with no = page cache to rapidly free and reclaims memory to and from the host respe= ctively. >> >> Benefit: >> With this patch-series, in our test-case, executed on a single system = and single NUMA node with 15GB memory, we were able to successfully launc= h 5 guests(each with 5 GB memory) when page hinting was enabled and 3 wit= hout it. (Detailed explanation of the test procedure is provided at the b= ottom under Test - 1). >> >> Changelog in v9: >> * Guest free page hinting hook is now invoked after a page has been m= erged in the buddy. >> * Free pages only with order FREE_PAGE_HINTING_MIN_ORDER(curre= ntly defined as MAX_ORDER - 1) are captured. >> * Removed kthread which was earlier used to perform the scanning, iso= lation & reporting of free pages. >> * Pages, captured in the per cpu array are sorted based on the zone n= umbers. This is to avoid redundancy of acquiring zone locks. >> * Dynamically allocated space is used to hold the isolated gue= st free pages. >> * All the pages are reported asynchronously to the host via vi= rtio driver. >> * Pages are returned back to the guest buddy free list only wh= en the host response is received. >> >> Pending items: >> * Make sure that the guest free page hinting's current impleme= ntation doesn't break hugepages or device assigned guests. >> * Follow up on VIRTIO_BALLOON_F_PAGE_POISON's device side support. (I= t is currently missing) >> * Compare reporting free pages via vring with vhost. >> * Decide between MADV_DONTNEED and MADV_FREE. >> * Analyze overall performance impact due to guest free page hinting. >> * Come up with proper/traceable error-message/logs. >> >> Tests: >> 1. Use-case - Number of guests we can launch >> >> NUMA Nodes =3D 1 with 15 GB memory >> Guest Memory =3D 5 GB >> Number of cores in guest =3D 1 >> Workload =3D test allocation program allocates 4GB memory, touches it= via memset and exits. >> Procedure =3D >> The first guest is launched and once its console is up, the test allo= cation program is executed with 4 GB memory request (Due to this the gues= t occupies almost 4-5 GB of memory in the host in a system without page h= inting). Once this program exits at that time another guest is launched i= n the host and the same process is followed. We continue launching the gu= ests until a guest gets killed due to low memory condition in the host. >> >> Results: >> Without hinting =3D 3 >> With hinting =3D 5 >> >> 2. Hackbench >> Guest Memory =3D 5 GB=20 >> Number of cores =3D 4 >> Number of tasks Time with Hinting Time without Hinting >> 4000 19.540 17.818 >> > How about memhog btw? > Alex reported: > > My testing up till now has consisted of setting up 4 8GB VMs on a syst= em > with 32GB of memory and 4GB of swap. To stress the memory on the syste= m I > would run "memhog 8G" sequentially on each of the guests and observe h= ow > long it took to complete the run. The observed behavior is that on the= > systems with these patches applied in both the guest and on the host I= was > able to complete the test with a time of 5 to 7 seconds per guest. On = a > system without these patches the time ranged from 7 to 49 seconds per > guest. I am assuming the variability is due to time being spent writin= g > pages out to disk in order to free up space for the guest. > Here are the results: Procedure: 3 Guests of size 5GB is launched on a single NUMA node with total memory of 15GB and no swap. In each of the guest, memhog is run with 5GB. Post-execution of memhog, Host memory usage is monitored by using Free command. Without Hinting: =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0= =C2=A0 Time of execution=C2=A0=C2=A0=C2=A0 Host used memory Guest 1:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 45 seconds=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 5.4 GB Guest 2:=C2=A0=C2=A0 =C2=A0=C2=A0 =C2=A0 45 seconds=C2=A0=C2=A0=C2=A0 =C2= =A0=C2=A0 =C2=A0=C2=A0 =C2=A0 10 GB Guest 3:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 1=C2=A0 minute=C2=A0=C2=A0=C2= =A0 =C2=A0=C2=A0 =C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 15 GB With Hinting: =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 =C2=A0 =C2=A0 Ti= me of execution =C2=A0=C2=A0=C2=A0 Host used memory Guest 1:=C2=A0=C2=A0 =C2=A0=C2=A0 =C2=A0 49 seconds=C2=A0=C2=A0=C2=A0 =C2= =A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 2.4 GB Guest 2:=C2=A0=C2=A0 =C2=A0=C2=A0 =C2=A0 40 seconds=C2=A0=C2=A0=C2=A0 =C2= =A0=C2=A0 =C2=A0=C2=A0 =C2=A0 4.3 GB Guest 3:=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 50 seconds=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0 6.3 GB --=20 Regards Nitesh --gsK4cdQ2SmPsmm3JcrDh3layyISQw5H9P-- --JxYzMsx6no2b159rO7jMVpujrTFgIS6rJ Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEkXcoRVGaqvbHPuAGo4ZA3AYyozkFAlyADHYACgkQo4ZA3AYy ozkwHxAAwWuIcoLYbXpaVTgkAQjS58cpp8y0fUeNTTCp9lLte05X7trXtbU84Ilm BGrPLyzl11WCPjC8SQ9UjbDq+1SbGTmxMNzEOKumXWbfNQk01B/1LK6NKdLi9Y+f Cu7Q7/p9wiBe1lLVPBsl2E6MgP+TDUkT1EVxG78d7XcCKeOQjB/TobGMRfrohyEo 8CaWFy5q6Pm3+vBXbfdec5hdSJwd6Sc8g1M0Axw9RWvEqaVtuhF1Z7Henm3BvU2R 89oNUZmGM6rHmdhKKqVcrV23WNLvSOobLwZHexydU/pHJfYtKzt8EBr+SMkRXUgK aKVuoZIMJPfJBtyE0CzSp33b738A9yatb6m0KOu0kKrwJ8YzgPI1F1T/Bwo0LxZ0 MRn3Qpm0J9xOOGeDRW+rPDVvWhwVX3/CnkcCTUFjzLV213kOwVt5kOmeg9oBw5Ui iyw+GE8u2W/mK+hPiZKPbH4TIS7TPddftyNO2OdZLM7jccJcXhkEHYPF446lV8c7 N9iCpGxEUXjIBDvmZX0mtBUkX0eIT838HgphfyOsDzsPtEcd2IkfxMUyUL8Qtj53 0Xt277DRWmw3euqjCsqTm1IfSO7zTB6ljxqK9YPFBSUziYnDEDUbIwBoDg08aCXD uBwnS9/DqS40HLXFUnDodu/c+ZaDr1jcuLh/clu8wzLLlOpNSFA= =J3yz -----END PGP SIGNATURE----- --JxYzMsx6no2b159rO7jMVpujrTFgIS6rJ--