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From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Gerd Hoffmann <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
	Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>,
	Guido Guenther <agx-wGvLLbajjwFAfugRpC6u6w@public.gmane.org>
Subject: Re: [PATCH] system_powerdown via acpi power button
Date: Thu, 24 Jan 2008 14:54:02 +0200	[thread overview]
Message-ID: <47988A6A.2030907@qumranet.com> (raw)
In-Reply-To: <479889B1.6030403-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Gerd Hoffmann wrote:
> Avi Kivity wrote:
>   
>> Agree, but should try a "quit" monitor command first.  Signals are racy, 
>> like anything that deals with pids (qemu dies, another process is 
>> fork()ed with the same pid, libvirt kills it).
>>     
>
> There is no race in that specific case because qemu is started by
> libvirtd.  libvirtd can savely kill qemu as long as it hasn't collected
> the exit status via waitpid().  While the qemu zombie hangs around the
> pid will not be reused.
>
>   

Ah good.  It does mean that the we can't recover from an untimely 
libvirtd death, but I'd consider it a reasonable tradeoff.

-- 
Any sufficiently difficult bug is indistinguishable from a feature.


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      parent reply	other threads:[~2008-01-24 12:54 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-03 18:11 [PATCH] system_powerdown via acpi power button Guido Guenther
     [not found] ` <20080103181132.GA1077-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-03 18:14   ` acpi sci polarity Guido Guenther
     [not found]     ` <20080103181415.GB1077-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-03 21:17       ` Avi Kivity
     [not found]         ` <477D50FE.4040104-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-04 18:31           ` Guido Guenther
     [not found]             ` <20080104183158.GA14002-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-06  9:08               ` Avi Kivity
     [not found]                 ` <47809A8F.5090803-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-07 11:59                   ` Guido Guenther
     [not found]                     ` <20080107115916.GA24050-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-07 12:02                       ` [PATCH] add acpi powerbutton support Guido Guenther
     [not found]                         ` <20080107120223.GB24050-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-07 12:44                           ` Avi Kivity
     [not found]                             ` <47821EC8.4020308-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-08  4:34                               ` Jun Koi
     [not found]                                 ` <fdaac4d50801072034p7f047495jd4be276c20623be3-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2008-01-08  8:09                                   ` Guido Guenther
     [not found]                                     ` <20080108080928.GA9823-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-19 15:40                                       ` Jan Kiszka
     [not found]                                         ` <479219D6.1000707-S0/GAf8tV78@public.gmane.org>
2008-01-20 11:56                                           ` Guido Guenther
     [not found]                                             ` <20080120115617.GA31618-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-21 10:00                                               ` Jan Kiszka
     [not found]                                                 ` <47946D4A.5000808-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-21 10:47                                                   ` Avi Kivity
     [not found]                                                     ` <47947857.4020004-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-21 11:35                                                       ` Jan Kiszka
     [not found]                                                         ` <47948376.9000105-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-21 12:52                                                           ` Avi Kivity
2008-01-22  9:48                                                       ` Gerd Hoffmann
     [not found]                                                         ` <4795BBE3.5060609-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2008-01-22 10:06                                                           ` Jan Kiszka
2008-01-08  8:50                                   ` Avi Kivity
     [not found]                                     ` <47833938.1020609-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-09 18:00                                       ` Guido Guenther
     [not found]                                         ` <20080109180001.GA11240-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-13  9:35                                           ` Avi Kivity
     [not found]                                             ` <4789DB74.5070901-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-13 13:48                                               ` Avi Kivity
     [not found]                                                 ` <478A1694.1010307-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-14 10:23                                                   ` Guido Guenther
     [not found]                                                     ` <20080114102326.GB8987-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-14 17:34                                                       ` Avi Kivity
2008-01-18 22:20                                                   ` Avi Kivity
     [not found]                                                     ` <47912648.4030101-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-19 14:04                                                       ` Guido Guenther
2008-01-14 10:21                                               ` Guido Guenther
2008-01-14 12:41                         ` Alexey Eremenko
     [not found]                           ` <64F9B87B6B770947A9F8391472E032160C95C641-yEcIvxbTEBqsx+V+t5oei8rau4O3wl8o3fe8/T/H7NteoWH0uzbU5w@public.gmane.org>
2008-01-14 13:30                             ` Guido Guenther
2008-01-22 10:11   ` [PATCH] system_powerdown via acpi power button Jan Kiszka
     [not found]     ` <4795C134.7030400-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-22 11:49       ` Guido Guenther
     [not found]         ` <20080122114955.GA28335-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-22 12:12           ` Jan Kiszka
     [not found]             ` <4795DD9C.3040804-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>
2008-01-24 12:37               ` Guido Guenther
     [not found]                 ` <20080124123730.GA4527-DVvpyRRQz99DDGxTMhc9XQ@public.gmane.org>
2008-01-24 12:41                   ` Avi Kivity
     [not found]                     ` <47988797.8040208-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2008-01-24 12:50                       ` Gerd Hoffmann
     [not found]                         ` <479889B1.6030403-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2008-01-24 12:54                           ` Avi Kivity [this message]

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