On Thu, 2017-05-11 at 12:15 -0700, Dan Williams wrote: > On Thu, May 11, 2017 at 11:17 AM, Stefan Hajnoczi <stefanha@xxxxxxxxx > m> wrote: > > On Wed, May 10, 2017 at 09:26:00PM +0530, Pankaj Gupta wrote: > > > We are sharing initial project proposal for > > > 'KVM "fake DAX" device flushing' project for feedback. > > > Got the idea during discussion with 'Rik van Riel'. > > > > CCing NVDIMM folks. > > > > > > > > Also, request answers to 'Questions' section. > > > > > > Abstract : > > > ---------- > > > Project idea is to use fake persistent memory with direct > > > access(DAX) in virtual machines. Overall goal of project > > > is to increase the number of virtual machines that can be > > > run on a physical machine, in order to increase the density > > > of customer virtual machines. > > > > > > The idea is to avoid the guest page cache, and minimize the > > > memory footprint of virtual machines. By presenting a disk > > > image as a nvdimm direct access (DAX) memory region in a > > > virtual machine, the guest OS can avoid using page cache > > > memory for most file accesses. > > How is this different than the solution that Clear Containers came up > with? > > https://lwn.net/Articles/644675/ Clear Containers uses MAP_PRIVATE with read-only images. This solution is about making read-write images work. When a program in the guest calls fsync, we need to ensure the data has actually hit the disk on the host side before fsync returns. -- All rights reversed
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