From: Wei Yang <richard.weiyang@huawei.com>
To: Dario Faggioli <dario.faggioli@citrix.com>
Cc: xuquan8@huawei.com, xen-devel@lists.xen.org,
liuxiaojian6@huawei.com, george.dunlap@eu.citrix.com,
Wei Yang <richard.weiyang@gmail.com>,
mengxu@cis.upenn.edu, Wei Yang <richard.weiyang@huawei.com>
Subject: Re: [Help] Trigger Watchdog when adding an IPI in vcpu_wake
Date: Sat, 24 Sep 2016 15:26:52 +0800 [thread overview]
Message-ID: <20160924072652.GB31810@linux-gk3p> (raw)
In-Reply-To: <1474538116.4393.371.camel@citrix.com>
On Thu, Sep 22, 2016 at 11:55:16AM +0200, Dario Faggioli wrote:
>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.
>
Oh, you have a link here ... let me digest it.
>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)
--
Richard Yang\nHelp you, Help me
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next prev parent reply other threads:[~2016-09-24 7:26 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
2016-09-24 7:26 ` Wei Yang [this message]
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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