From: Olaf Hering <olaf@aepfle.de>
To: Paul Durrant <Paul.Durrant@citrix.com>
Cc: James Harper <james.harper@bendigoit.com.au>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: xenbus stress testing
Date: Fri, 18 Feb 2011 13:01:10 +0100 [thread overview]
Message-ID: <20110218120110.GA20514@aepfle.de> (raw)
In-Reply-To: <291EDFCB1E9E224A99088639C47620228CFFAD8287@LONPMAILBOX01.citrite.net>
On Fri, Feb 18, Paul Durrant wrote:
> How do you propose to lock against another VM updating a counter in shared memory?
I thought xenstore uses the same ringbuffer as defined by
DEFINE_RING_TYPES(). But reading the code in
include/xen/interface/io/xs_wire.h shows it has its own logic.
And reading further in xenpaging code, which I had in mind while I wrote
the mail, shows there is a separate spinlock.
I can imagine that even if a lock exists, a VM crashing while holding
the lock can stall all other VMs. So its probably not the best idea.
Olaf
next prev parent reply other threads:[~2011-02-18 12:01 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-17 9:01 xenbus stress testing James Harper
2011-02-17 19:06 ` Ian Jackson
2011-02-17 22:17 ` James Harper
2011-02-18 11:05 ` Olaf Hering
2011-02-18 11:43 ` Paul Durrant
2011-02-18 12:01 ` Olaf Hering [this message]
2011-02-18 12:43 ` James Harper
2011-02-18 12:25 ` Ian Jackson
2011-02-18 12:42 ` James Harper
2011-02-18 13:08 ` Keir Fraser
2011-02-18 15:30 ` Ian Jackson
2011-02-18 22:36 ` James Harper
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