Most pragmas have this syntax:

Generally, use on or off to change the option's setting, and then use reset to restore the option's original setting, as shown below:

#pragma profile off
  // If the option Generate Profiler Calls is on,
  // turns it off for these functions.

#include <smallfuncs.h>

#pragma profile reset
  // If the option Generate Profiler Calls was originally on,
  // turns it back on. Otherwise, the option remains off

Suppose that you use #pragma profile on instead of #pragma profile reset. If you later turn off Generate Profiler Calls from the Preference dialog, that pragma turns it on. Using reset ensures that you don't inadvertently change the settings in the Project Settings dialog.