[Bug 832507] Re: console.log grows indefinitely

[Anthony Liguori]

I don't understand what the file argument would mean.  Once you write()
to a file, QEMU no longer can implement a ring buffer (it cannot discard
written data).  You would need to do something like the following:

qemu -chardev memchr,max-capacity=640k,id=foo -serial chardev:foo

And then introduce QMP commands like:

{ 'command': 'memchr-read', 'arguments': { 'chardev': 'str', 'size':
'int' }, 'returns': 'str' }

We already have a memory character device that we don't expose
externally yet.  It's just a matter of implementing a ring queue
behavior and plumbing things up.  I think it's entirely reasonable and
perhaps would even be something that libvirt would prefer to use in the
long term over ptys.

Would also be good for unit testing.

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Title:
  console.log grows indefinitely

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