Understanding Linux CPU stats

If it's exposed to userspace, you can log it. You can then replay it or graph it, changing the granularity from the sample period upwards.

E.g.

$> perf stat echo "hi"

     Performance counter stats for 'echo hi':

              0.718209      task-clock (msec)         #    0.595 CPUs utilized          
                     2      context-switches          #    0.003 M/sec                  
                     0      cpu-migrations            #    0.000 K/sec                  
                    59      page-faults               #    0.082 M/sec                  
               844,067      cycles                    #    1.175 GHz                    
               561,879      stalled-cycles-frontend   #   66.57% frontend cycles idle   
       <not supported>      stalled-cycles-backend   
               611,918      instructions              #    0.72  insns per cycle        
                                                      #    0.92  stalled cycles per insn
               127,740      branches                  #  177.859 M/sec                  
                 7,279      branch-misses             #    5.70% of all branches        
    
           0.001207821 seconds time elapsed