Re: [Qemu-devel] [PATCH v3] async: aio_context_new(): Handle event_notifier_init failure

[Eric Blake <eblake@redhat.com>]

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On 09/17/2014 03:16 AM, Chrysostomos Nanakos wrote:
> On 09/16/2014 10:40 PM, Eric Blake wrote:
>> On 09/16/2014 12:04 PM, Chrysostomos Nanakos wrote:
>>> If event_notifier_init fails QEMU exits without printing
>>> any error information to the user. This commit adds an error
>>> message on failure:
>>>
>>>   # qemu [...]
>> Showing the actual command line you used would be helpful.
> 
> The problem raised after having a system with a low limit of open files
> and QEMU with 8 iothread objects. Do you believe that we should add such
> a command line in the commit description? The problem can be easily
> reproduced with any combination of low limit of open files and iothread
> objects or even a low limit of open files without the creation of
> iothreads.

It is ALWAYS valuable to make your commit message give a good recipe for
how to reproduce the problem your commit is fixing.  It's not a
prerequisite (a patch can be accepted on inspection alone), but giving
full details of how to reproduce it makes life easier when revisiting
the patch a year from now or when writing a test case to ensure no
regressions.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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