Gilles Chanteperdrix wrote: > Hi, > > in order to test the nocow patch, I wrote the attached test. Despite the > fact that there is no longer any page fault (I have nucleus debugging > on, so I would get a message if there was a fault), there is still an > unwanted mode switch at step 5. Any idea what could be the cause ? >
Put in some xntrace_user_freeze(0) before or after the point-of-interest in the program, switch on the tracer, and check ipipe/trace/frozen (with appropriate back_trace_points or post_trace_points) what is going on. Once you know the particular code path, instrumenting it can also be done this way: xntrace_special(some_id, some_value_of_interest). Jan
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