Re: [Xen-devel] [PATCH] x86/EPT: flush cache when (potentially) limiting cachability

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.06.14 at 03:28, <songtaox.liu@xxxxxxxxx> wrote:
>> From: Jan Beulich [mailto:jbeulich@xxxxxxxx]
>> >>> "Liu, SongtaoX" <songtaox.liu@xxxxxxxxx> 05/30/14 9:35 AM >>>
>> >Sorry to update.
>> >The bug refers to
>> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1887.
>> >L2 guest vnc console hangs at black screen with cursor flashing at the top 
> left
>> corner.
>> >After several minutes, the Seabios screen shows up, but the screen still 
> flush
>> slowly, the guest could not boot up.
>> 
>> That would then indeed be an indication of excessive flushes. I.e. you may 
> want
>> to simply track down which one (and why) gets triggered too often.
>> 
> How to get that information? It is hard for me to do it since I am not a Xen 
> expert. But if you can provide a patch help to debug, I would happy to do it.

The original patch makes quite clear where to put the instrumentation;
I'm attaching a patch anyway for you to try. This (obviously) is against
the current staging tree - while it ought to apply fine on master, it
certainly won't apply on 4.4 or older without adjustments.

Jan

Attachment: EPT-track-cache-flushes.patch
Description: Text document

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