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Re: [Qemu-devel] [PATCH 1/2] Dump: introduce a Filesystem in Userspace

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH 1/2] Dump: introduce a Filesystem in Userspace
Date: Mon, 9 May 2016 17:13:07 +0100
User-agent: Mutt/1.6.0 (2016-04-01)

On Mon, May 09, 2016 at 09:52:28AM -0600, Eric Blake wrote:
> On 05/07/2016 05:32 PM, Nan Li wrote:
> > 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.
> Why introduce FUSE? Can we reuse NBD instead?

The commit message talks of letting QEMU dump to RAM avoiding disk I/O.
IOW, it seems like it could just dump to any tmpfs directory.

I'm not really seeing a compelling reason why QEMU needs to mount a fuse
filesystem itself - whatever app is using QEMU could handle mounting of
fs without QEMU's involvement at all.

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