lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-ID: <20210210180405.GP4718@ziepe.ca> Date: Wed, 10 Feb 2021 14:04:05 -0400 From: Jason Gunthorpe <jgg@...pe.ca> To: "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com> Cc: David Hildenbrand <david@...hat.com>, "Wangzhou (B)" <wangzhou1@...ilicon.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>, "linux-mm@...ck.org" <linux-mm@...ck.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, Alexander Viro <viro@...iv.linux.org.uk>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "kevin.tian@...el.com" <kevin.tian@...el.com>, "jean-philippe@...aro.org" <jean-philippe@...aro.org>, "eric.auger@...hat.com" <eric.auger@...hat.com>, "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>, "zhangfei.gao@...aro.org" <zhangfei.gao@...aro.org>, "chensihang (A)" <chensihang1@...ilicon.com> Subject: Re: [RFC PATCH v3 1/2] mempinfd: Add new syscall to provide memory pin On Tue, Feb 09, 2021 at 10:22:47PM +0000, Song Bao Hua (Barry Song) wrote: > The problem is that SVA declares we can use any memory of a process > to do I/O. And in real scenarios, we are unable to customize most > applications to make them use the pool. So we are looking for some > extension generically for applications such as Nginx, Ceph. But those applications will suffer jitter even if their are using CPU to do the same work. I fail to see why adding an accelerator suddenly means the application owner will care about jitter introduced by migration/etc. Again in proper SVA it should be quite unlikely to take a fault caused by something like migration, on the same likelyhood as the CPU. If things are faulting so much this is a problem then I think it is a system level problem with doing too much page motion. Jason
Powered by blists - more mailing lists