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Re: [Xen-devel] Overhead incurred due to Xen for a page fault

from [Randy Thelen] [Permanent Link][Original]
To: pak333@xxxxxxxxxxx
Subject: Re: [Xen-devel] Overhead incurred due to Xen for a page fault
From: Randy Thelen <rthelen@xxxxxxxxxx>
Date: Thu, 23 Mar 2006 23:00:49 -0800
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pak333@xxxxxxxxxxx wrote:
I would like to get some help on estimating the cost of page fault handling in Xen. Can someone help me identify where I need to put the hooks into the xen source. 

Check arch/x86/traps.c, look for the function:

asmlinkage int do_page_fault(struct cpu_user_regs *regs)

It has some hooks for measuring counts.  You can add timing information.
Note that page faults are fundamentally handled by the guest O/S, Xen simply forwards them. 

-- Randy

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