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From: Yu Zhiguo <yuzg@cn.fujitsu.com>
To: Vincent Hanquez <vincent.hanquez@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: why xenstore-* hangs if xenstored is not started
Date: Tue, 22 Jun 2010 15:58:44 +0800	[thread overview]
Message-ID: <4C206D34.1060909@cn.fujitsu.com> (raw)
In-Reply-To: <4C2069F2.9090408@eu.citrix.com>

Hi,

Vincent Hanquez wrote:

> That's the common behavior of task stuck in a kernel operation (ps aux
> will show the task at D, and /proc/<pid>/wchan will tell you exactly
> where it's blocked in the kernel).
> 
> the write is going to wait for a xenstored reply in kernel mode since by
> default the xenstore-* tools use the kernel xenstore page to communicate
> with xenstored.
> 
> The unix socket operations doesn't have this "problems" (xenstore-* -s)
> 

Thanks~~
I confirmed the task is at D+ and there are no this "problem" if use option -s.
But I think S+ is better than D+...


Yu

  reply	other threads:[~2010-06-22  7:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-22  7:32 why xenstore-* hangs if xenstored is not started Yu Zhiguo
2010-06-22  7:44 ` Vincent Hanquez
2010-06-22  7:58   ` Yu Zhiguo [this message]
2010-06-22  8:27     ` Vincent Hanquez
2010-06-22  8:46       ` Yu Zhiguo
2010-06-22  7:45 ` Keir Fraser
2010-06-22  7:56   ` Vincent Hanquez
2010-06-22  8:06     ` Keir Fraser
2010-06-22  8:26       ` Vincent Hanquez
2010-06-22  8:12   ` Yu Zhiguo

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