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Re: [Xen-devel] event TRC_MEM_PAGE_GRANT_TRANSFER

To: Cesar Fernandes <darkvib@xxxxxxxxx>
Subject: Re: [Xen-devel] event TRC_MEM_PAGE_GRANT_TRANSFER
From: Rob Gardner <rob.gardner@xxxxxx>
Date: Tue, 23 Jan 2007 10:51:27 -0700
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Cesar Fernandes wrote:
Greetings,

I'm using xen 3.0.4_1. I need to log the event TRC_MEM_PAGE_GRANT_TRANSFER, which, I believe, is the number of page exchanges between domU and dom0. It seems that this event is not being logged in xen buffer, therefore, xenmon/xentrace is not working either.


Yeah I noticed that I/O count has not been working lately in xenmon but haven't had a chance yet to see why. The TRC_MEM_PAGE_GRANT_TRANSFER event is being "logged" but the reason it doesn't show up in the trace buffer may be because that event is never actually happening. It seems that there has been some change in the mechanism used to move I/O pages between domains.

So some research needs to be done to figure out exactly what code should be instrumented with some trace call in order to provide xenmon with data on the number of I/O's or I/O pages. If anyone can help, it would be appreciated.

Rob Gardner


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