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Re: [Xen-devel] Re: [Xen-ia64-devel] Weekly benchmark results [ww24]

To: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [Xen-ia64-devel] Weekly benchmark results [ww24]
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Tue, 20 Jun 2006 11:06:36 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, "yo.fujita" <yo.fujita@xxxxxxxxxxxxxxxx>, "'You, Yongkang'" <yongkang.you@xxxxxxxxx>, Steven.Hand@xxxxxxxxxxxx, 'Alex Williamson' <alex.williamson@xxxxxx>, xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
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In-reply-to: Message from Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx> of "Tue, 20 Jun 2006 14:26:04 +0900." <200606200526.k5K5QWlK009993@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>
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>==================
>STATUS
>==================
>I do the heavy load test of create/destroy.
>CREDIT scheduler(cshed_schedule) checks BUG_ON(!vcpu_running) at the end of co
de.
>It makes error.
>The reason is that
>atomic_inc(&v->pausecnt)@vcpu_pause() is called without lock.
>(spin_lock(&schedule_data[cpu].schedule_lock))
>This lock-less "pausecnt" makes vcpu_running state changing 
>during the lock of 
>spin_lock_irq(&schedule_data[cpu].schedule_lock)@__enter_schduler().
>The code of cshed_schedule exists within this lock. 

Thanks for this - we have also reproduced. 
The assertation was in fact bogus as you surmised. Have checked in a 
fix. 

cheers,

S.

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