Re: [Xen-ia64-devel] [PATCH] xentrace buffer alignment

[Rob Gardner <rob.gardner@xxxxxx>]

Masaki Kanno wrote:

> Hi,
>
> When the "tbuf_size=" option was added,
> Xen cannot be booted and show the following messages.
>
> (XEN) About to call init_trace_bufs()
> (XEN) Xen trace buffers: initialised
> (XEN) About to call schedulers_start dom0=f0000000040ec100, 
> idle0_dom=f0000000040d2e10
> (XEN) ia64_handle_reflection: reflecting with priv=0!!
>
> Unaligned Reference fault occurred in trace function.
> This small patch correct alignment of the trace buffer. 
>  
Hmmm, x86-64 must have more relaxed alignment rules than ia64, since all 
that works ok on an athlon64. You may want to also check and make sure 
tools/xentrace_format still works (assuming it ever worked on ia64). The 
python code in that script is sensitive to structure packing.
Rob Gardner
(at the desk right next to Magenheimer)



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