1. 11 Jun, 2015 26 commits
  2. 10 Jun, 2015 1 commit
    • Aneesh Kumar K.V's avatar
      powerpc/mm: Add trace point for tracking hash pte fault · cfcb3d80
      Aneesh Kumar K.V authored
      This enables us to understand how many hash fault we are taking
      when running benchmarks.
      
      For ex:
      -bash-4.2# ./perf stat -e  powerpc:hash_fault -e page-faults /tmp/ebizzy.ppc64 -S 30  -P -n 1000
      ...
      
       Performance counter stats for '/tmp/ebizzy.ppc64 -S 30 -P -n 1000':
      
             1,10,04,075      powerpc:hash_fault
             1,10,03,429      page-faults
      
            30.865978991 seconds time elapsed
      
      NOTE:
      The impact of the tracepoint was not noticeable when running test. It was
      within the run-time variance of the test. For ex:
      
      without-patch:
      --------------
      
       Performance counter stats for './a.out 3000 300':
      
      	       643      page-faults               #    0.089 M/sec
      	  7.236562      task-clock (msec)         #    0.928 CPUs utilized
      	 2,179,213      stalled-cycles-frontend   #    0.00% frontend cycles idle
      	17,174,367      stalled-cycles-backend    #    0.00% backend  cycles idle
      		 0      context-switches          #    0.000 K/sec
      
             0.007794658 seconds time elapsed
      
      And with-patch:
      ---------------
      
       Performance counter stats for './a.out 3000 300':
      
      	       643      page-faults               #    0.089 M/sec
      	  7.233746      task-clock (msec)         #    0.921 CPUs utilized
      		 0      context-switches          #    0.000 K/sec
      
             0.007854876 seconds time elapsed
      
       Performance counter stats for './a.out 3000 300':
      
      	       643      page-faults               #    0.087 M/sec
      	       649      powerpc:hash_fault        #    0.087 M/sec
      	  7.430376      task-clock (msec)         #    0.938 CPUs utilized
      	 2,347,174      stalled-cycles-frontend   #    0.00% frontend cycles idle
      	17,524,282      stalled-cycles-backend    #    0.00% backend  cycles idle
      		 0      context-switches          #    0.000 K/sec
      
             0.007920284 seconds time elapsed
      Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
      cfcb3d80
  3. 07 Jun, 2015 13 commits