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* xentrace: Remove redundant tb_done_init checks, and add missing ones.Keir Fraser2008-02-111-5/+5
| | | | | | | Hand inspection of gcc -02 output confirms significantly shorter codepaths for inactive (i.e. normal case) tracing. Signed-off-by: Michael A Fetterman <Michael.Fetterman@cl.cam.ac.uk>
* xentrace/x86: PV guest tracing extensions.Keir Fraser2007-10-121-0/+46
From: George Dunlap <gdunlap@xensource.com> Signed-off-by: Keir Fraser <keir@xensource.com>