[Xen-devel] [PATCH][TOOLS] libxc: make error path more verbose

["Christoph Egger" <Christoph.Egger@xxxxxxx>]

Hi!

Attached patch makes qemu's output more verbose on failures.

Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>

The qemu process seems to leak memory by performing more mmap() calls than 
munmap()'s. When a HVM guest with a 12GB image runs fsck, then the guest 
window disappears when the qemu process dies.

Then /var/log/qemu-dm-<domid>.log shows this:

I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
xc_map_foreign_batch error 12

With the attached patch you see this:

I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0
xc_map_foreign_batch: mmap failed: Cannot allocate memory
xc_map_foreign_batch error 12

For short: The patch makes it easier to figure out
when you triggered the resource exhausting bug.



-- 
AMD Saxony, Dresden, Germany
Operating System Research Center

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Attachment: tools_libxc.diff
Description: Text document

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