[test-suite] litsupport/modules/perf.py: store profile filename in context.profilefile

[lebedev.ri]

Summary

This

1. Removes duplication
2. Provides that filename to be potentially used by other modules (see next patch)

[fhahn]

Looks like a straight-forward fix, LGTM

[lebedev.ri]

Yay! Thank you!

test-suite/trunk/litsupport/modules/perf.py

 """Test Module to perform an extra execution of the benchmark in the linux
 perf tool."""
 from litsupport import shellcommand
 from litsupport import testplan
 from litsupport.modules import run_under
 
 
 def _mutateCommandLine(context, commandline):
-    profilefile = context.tmpBase + ".perf_data"
+    context.profilefile = context.tmpBase + ".perf_data"
+    # Storing profile file in context allows other modules to be aware of it.
     cmd = shellcommand.parse(commandline)
     cmd.wrap('perf', [
         'record',
         '-e', context.config.perf_profile_events,
-        '-o', profilefile,
+        '-o', context.profilefile,
         '--'
     ])
     if cmd.stdout is None:
         cmd.stdout = "/dev/null"
     else:
         cmd.stdout += ".perfrecord"
     if cmd.stderr is None:
         cmd.stderr = "/dev/null"
     else:
         cmd.stderr += ".perfrecord"
     return cmd.toCommandline()
 
 
 def mutatePlan(context, plan):
     script = context.parsed_runscript
     if context.config.run_under:
         script = testplan.mutateScript(context, script,
                                        run_under.mutateCommandLine)
     script = testplan.mutateScript(context, script, _mutateCommandLine)
     plan.profilescript += script
     plan.metric_collectors.append(
-        lambda context: {'profile': context.tmpBase + '.perf_data'})
+        lambda context: {'profile': context.profilefile})