From: Dario Faggioli <dario.faggioli@citrix.com>
To: Wei Yang <richard.weiyang@gmail.com>,
Wei Yang <richard.weiyang@huawei.com>
Cc: george.dunlap@eu.citrix.com, xuquan8@huawei.com,
mengxu@cis.upenn.edu, liuxiaojian6@huawei.com,
xen-devel@lists.xen.org
Subject: Re: [Help] Trigger Watchdog when adding an IPI in vcpu_wake
Date: Thu, 22 Sep 2016 11:55:16 +0200 [thread overview]
Message-ID: <1474538116.4393.371.camel@citrix.com> (raw)
In-Reply-To: <1474535535.4393.339.camel@citrix.com>
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On Thu, 2016-09-22 at 11:12 +0200, Dario Faggioli wrote:
> _Almost_ correct. However, the problem is more that vcpu_wake() can
> happen in response to an IRQ, and when you grab a spinlock in IRQ
> context, you need to disable IRQs.
>
> There is a good explanation of why, here:
>
Ah, sorry, link is missing! Here:
https://www.kernel.org/doc/Documentation/locking/spinlocks.txt
Read the "Lesson 3: spinlocks revisited." section.
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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next prev parent reply other threads:[~2016-09-22 9:55 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20160913085437.GA14514@linux-gk3p>
2016-09-13 11:30 ` [Help] Trigger Watchdog when adding an IPI in vcpu_wake Dario Faggioli
2016-09-14 10:44 ` Wei Yang
2016-09-14 16:18 ` Dario Faggioli
2016-09-16 2:49 ` Wei Yang
2016-09-16 16:07 ` Dario Faggioli
2016-09-17 0:31 ` Wei Yang
2016-09-19 23:24 ` Dario Faggioli
2016-09-20 3:51 ` Wei Yang
2016-09-17 3:30 ` Wei Yang
2016-09-22 9:12 ` Dario Faggioli
2016-09-22 9:55 ` Dario Faggioli [this message]
2016-09-24 7:26 ` Wei Yang
2016-09-24 3:39 ` Wei Yang
2016-09-26 10:18 ` Dario Faggioli
2016-09-28 3:44 ` Wei Yang
2016-09-18 4:03 ` Wei Yang
2016-09-22 9:47 ` Dario Faggioli
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