• Alexey Budankov's avatar
    perf record: Enable arbitrary event names thru name= modifier · f92da712
    Alexey Budankov authored
    Enable complex event names containing [.:=,] symbols to be encoded into Perf
    trace using name= modifier e.g. like this:
    
      perf record -e cpu/name=\'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM\',\
    		  period=0x3567e0,event=0x3c,cmask=0x1/Duk ./futex
    
    Below is how it looks like in the report output. Please note explicit escaped
    quoting at cmdline string in the header so that thestring can be directly reused
    for another collection in shell:
    
    perf report --header
    
      # ========
      ...
      # cmdline : /root/abudanko/kernel/tip/tools/perf/perf record -v -e cpu/name=\'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM\',period=0x3567e0,event=0x3c,cmask=0x1/Duk ./futex
      # event : name = OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM, , type = 4, size = 112, config = 0x100003c, { sample_period, sample_freq } = 3500000, sample_type = IP|TID|TIME, disabled = 1, inh
      ...
      # ========
      #
      #
      # Total Lost Samples: 0
      #
      # Samples: 24K of event 'OFFCORE_RESPONSE:request=DEMAND_RFO:response=L3_HIT.SNOOP_HITM'
      # Event count (approx.): 86492000000
      #
      # Overhead  Command  Shared Object     Symbol
      # ........  .......  ................  ..............................................
      #
          14.75%  futex    [kernel.vmlinux]  [k] __entry_trampoline_start
    ...
    
      perf stat -e cpu/name=\'CPU_CLK_UNHALTED.THREAD:cmask=0x1\',period=0x3567e0,event=0x3c,cmask=0x1/Duk ./futex
    
      10000000 process context switches in 16678890291ns (1667.9ns/ctxsw)
    
       Performance counter stats for './futex':
    
          88,095,770,571      CPU_CLK_UNHALTED.THREAD:cmask=0x1
    
            16.679542407 seconds time elapsed
    Signed-off-by: default avatarAlexey Budankov <alexey.budankov@linux.intel.com>
    Acked-by: default avatarAndi Kleen <ak@linux.intel.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/c194b060-761d-0d50-3b21-bb4ed680002d@linux.intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    f92da712
perf-record.txt 18.7 KB