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From: Ingo Molnar <mingo@elte.hu>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>,
	"jens.axboe@oracle.com" <jens.axboe@oracle.com>,
	"paulmck@linux.vnet.ibm.com" <paulmck@linux.vnet.ibm.com>,
	"nickpiggin@yahoo.com.au" <nickpiggin@yahoo.com.au>,
	"torvalds@linux-foundation.org" <torvalds@linux-foundation.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Mallick, Asit K" <asit.k.mallick@intel.com>
Subject: Re: [patch] generic-ipi: fix the smp_mb() placement
Date: Fri, 31 Oct 2008 10:39:24 +0100	[thread overview]
Message-ID: <20081031093924.GG30317@elte.hu> (raw)
In-Reply-To: <490A9337.6090504@goop.org>


* Jeremy Fitzhardinge <jeremy@goop.org> wrote:

> Suresh Siddha wrote:
>> We didn't see the lockup in our tests but Xen folks reported similar failures
>> with their smp call function code.
>>   
>
> ...really?  I don't remember anything like that, but perhaps I'm 
> forgetting something.  In Xen the IPI is sent with a hypercall, 
> which is definitely a solid enough barrier for these purposes.

i think Suresh might be referring to some of the fragilities Xen had 
with generic-ipi. But those AFAICT were due to the on-stack lifetime 
bug that Nick fixed via the kmalloc? v2.6.26-ish issue.

	Ingo

  reply	other threads:[~2008-10-31  9:40 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-29 22:42 Suresh Siddha
2008-10-30  7:20 ` Jens Axboe
2008-10-30 16:30   ` Suresh Siddha
2008-10-30 17:25     ` Jens Axboe
2008-10-30 18:53 ` Ingo Molnar
2008-10-30 20:23   ` Suresh Siddha
2008-10-31  5:10     ` Jeremy Fitzhardinge
2008-10-31  9:39       ` Ingo Molnar [this message]
2008-10-31 11:12         ` Jeremy Fitzhardinge
2008-10-31 16:53           ` Suresh Siddha
2008-10-31 20:30             ` Jeremy Fitzhardinge
2008-11-03 10:17               ` Ingo Molnar
2008-11-03 23:48                 ` Jeremy Fitzhardinge
2008-11-04  9:19                   ` Ingo Molnar
2008-11-04 22:25                     ` Suresh Siddha
2008-11-05  9:20                       ` Jens Axboe

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