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Re: [Qemu-devel] [PATCH 0/2] Dump: add a Filesystem in Userspace and com

From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] [PATCH 0/2] Dump: add a Filesystem in Userspace and command "fuse-mount"
Date: Tue, 10 May 2016 10:47:36 +0100
User-agent: Mutt/1.6.0 (2016-04-01)

On Sun, May 08, 2016 at 07:32:46AM +0800, Nan Li wrote:
> These two patches introduce a Filesystem in Userspace (FUSE) and add a 
> "fuse-mount" command to support this filesystem.
> (1)
> When running the command "dump-guest-memory", we usually need a large space
> of storage to save the dumpfile into disk. It costs not only much time to
> save a file in some of hard disks, but also costs limited storage in host.
> In order to reduce the saving time and make it convenient for users to dump
> the guest memory, we introduce a Filesystem in Userspace (FUSE) to save the
> dump file in RAM. It is selectable in the configure file, adding a compiling
> of package "fuse-devel". It doesn't change the way of dumping guest memory.

This FUSE file system looks like a subset of tmpfs.  Why don't you just
use tmpfs?

Even if there was a reason to reinvent tmpfs, please do that as a
separate project.  The in-memory file system functionality is not
specific to QEMU's dump-guest-memory.


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