[Bug 198723] [hwpmc] pmcstat -p (process counting) gets corrupted even if pinned to a CPU

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198723

            Bug ID: 198723
           Summary: [hwpmc] pmcstat -p (process counting) gets corrupted
                    even if pinned to a CPU
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: adrian at freebsd.org

Here's a fun one:

cpuset -l 2 pmcstat -w 1 -p CPU_CLK_UNHALTED_CORE -p
PARTIAL_RAT_STALLS.SLOW_LEA_WINDOW -p PARTIAL_RAT_STALLS.MUL_SINGLE_UOP
./himenobmtxpa M 384
mimax = 128 mjmax = 128 mkmax = 256
imax = 127 jmax = 127 kmax =255
 Start rehearsal measurement process.
 Measure the performance in 3 times.

 MFLOPS: 1487.222542 time(s): 0.271122 1.733593e-03

 Now, start the actual measurement process.
 The loop will be excuted in 663 times
 This will take about one minute.
 Wait for a while

# p/CPU_CLK_UNHALTED_CORE p/PARTIAL_RAT_STALLS.SLOW_LEA_WINDOW
p/PARTIAL_RAT_STALLS.MUL_SINGLE_UOP 
               2391336164                              2808870                 
         468916620 
               2391116254                              2841466                 
         580442618 
               2391286584                              2855097                 
         580087732 
               2391228957                              2900509                 
         578770832 
               2391232010                              2840303                 
   281471262184436 
               2391175692                              2841502                 
         580400260 
               2391261851                              2844140                 
         580443655 
               2391267208                              2845348               
18446462599313378116 
               2391258793                              2844923                 
         580426258 
               2391283394                              2844559                 
         580358142 
               2391251898                              2844617                 
         580418628 
               2391287371                              2844894                 
   281471262213505 
               2391220843                              2844253                 
         580344542 
               2391210632                              2844542                 
         580359758 
               2391286696                              2844145               
18446462599313346923 
               2391222766                              2843902                 
         580428539 
               2391301558                              2845050                 
         580449769 
               2391220296                              2845291                 
         580429033 
               2391229903                              2843954                 
   281471262221908 
               2391151757                              2844754                 
         580463504 
               2391264515                              2844853                 
         580580231 
               2390984664                              2846816                 
         580756378 
               2391363113                              2848440               
18446462599314405744 
               2391327705                              2844575                 
         580393026 
               2391327491                              2845494                 
         580487580 
               2391338337                              2844307                 
         580304875 
               2391360320                              2881127                 
   281471261156617 
               2391356197                              2880822                 
         579204685 
               2391272958                              2845046                 
         580382413 
               2391316177                              2843457               
18446462599313098960 
               2391336593                              2845009                 
         580494044 
               2391314220                              2844990                 
         580520104 
               2391321150                              2844087                 
         580434830 
               2391344912                              2843830                 
   281471262041250 
               2391335165                              2844355                 
         580422841 ^Croot at bruce:/home/adrian # 


Notice how some of these event counters are huge? they shouldn't be; they're
cycle counters.

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