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Re: [libvirt] [PATCH v3 4/5] Add a watchdog action `dump'

On 12/01/2010 05:50 PM, Hu Tao wrote:
> On Tue, Nov 30, 2010 at 03:21:36PM -0700, Eric Blake wrote:
> <...snip...>
>>> -libvirt_qemu_la_SOURCES = libvirt-qemu.c
>>> +libvirt_qemu_la_SOURCES = libvirt-qemu.c util/threadpool.c
>> Why is this change necessary?  Shouldn't libvirt_util.la already include
>> threadpool.c, and the qemu driver already be linking with libvirt_util.la?
> Is this ok?
> -libvirt_driver_qemu_la_LIBADD = $(NUMACTL_LIBS)
> +libvirt_driver_qemu_la_LIBADD = $(NUMACTL_LIBS) ../src/libvirt_util.la

Nope; rather...

> Or link will fail:
>   CCLD   libvirtd
> libvirtd-libvirtd.o: In function `qemudRunLoop':
> /mnt/data/kernel/libvirt/daemon/libvirtd.c:2229: undefined reference to `virWorkerPoolNew'
> /mnt/data/kernel/libvirt/daemon/libvirtd.c:2287: undefined reference to `virWorkerPoolFree'

That means you need to modify src/libvirt_private.syms to export the new
public interfaces from threadpool.h (it should be pretty easy to figure
out what edits to make, the tricky part is realizing you need to touch
that file in the first place).

>>> +        if (virAsprintf(&qemu_driver->autoDumpPath, "%s/qemu/dump", base) == -1)
>>> +            goto out_of_memory;
>> However, it does raise an issue.  Is qemu.conf only for privileged
>> users, or do we have to worry about allowing non-privileged users also
>> be able to pick up an alternate directory (especially since they can't
>> dump to /var/log/...)?
> qemu.conf is only for privileged users, but non-privileged users who
> need to analyze dump files should ask admin to specify an auto-dump
> directory they have right to read.
> Or do you have a better idea?

Is it better to dump a non-privileged log into ~/.libvirt/qemu/dump, so
that it's automatically user-accessible?  We already use ~/.libvirt for
other non-privileged files.

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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