[Xen-devel] Remus memcpy dirty pages if local host

[Sunny Raj <sundaresan12@xxxxxxxxx>]

Hi,

I'm Sunny Raj, and this is the first time I'm posting to xen-devel. I'm a research student currently working on some aspects of virtual machine introspection. Specifically, instead of introspecting the VM directly, I use remus to checkpoint the VM to a backup on to the localhost, and run introspection on the backup; one of the main reasons is that this allows me to do more complex introspection techniques without incurring addition overhead on the primary VM.

But remus, regardless of localhost or not, seems to use ssh to write the data (dirty pages) to a stream, and have the backup read from the stream. This seems to take a lot of time (~50 to 100 milliseconds).

What I would like to do instead is to see if there is a way to memcpy the dirty pages from primary to the backup since it is on the localhost. Currently in write_batch() function in xc_sr_save.c, we have all the data we need in the iov datastructure. Is it possible to memcpy this onto the backup?

Thanks,

Sunny

--

Sunny

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