[PATCH] Tracepoint speed test

[Stan Shebs <stanshebs at earthlink dot net>]

This patch adds a test of tracepoint speed to the testsuite.  It's a 
little complicated, because it exercises both slow and fast tracepoints, 
it attempts to adjust its looping time to accommodate different kinds of 
hardware, and the test program is set up to be useful for interactive 
experimentation as well.  So I'm going to leave it up for review for a 
week or so, in case anybody has any questions or comments.

There are a couple things to note: 1) it adjusts loop iterations by 
simply doubling the number until the test loops run for at least a 
second each, with a couple checks to keep it from getting out of hand, 
and 2) it uses getrusage to compute CPU time.  While it seems 
appropriate to conditionalize this from configure, I note that our test 
cases never seem to use configury, instead just letting the compilation 
fail and the test return early.

Stan
stan@codesourcery.com

2011-09-08  Stan Shebs <stan@codesourcery.com>

    * gdb.trace/tspeed.exp: New file.
    * gdb.trace/tspeed.c: New file.

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