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linux/tools/perf/arch/x86
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Kan Liang 42641d6f4d perf stat: Add Topdown metrics events as default events 
The Topdown Microarchitecture Analysis (TMA) Method is a structured
analysis methodology to identify critical performance bottlenecks in
out-of-order processors. From the Ice Lake and later platforms, the
Topdown information can be retrieved from the dedicated "metrics"
register, which isn't impacted by other events. Also, the Topdown
metrics support both per thread/process and per core measuring.  Adding
Topdown metrics events as default events can enrich the default
measuring information, and would not cost any extra multiplexing.

Introduce arch_evlist__add_default_attrs() to allow architecture
specific default events. Add the Topdown metrics events in the X86
specific arch_evlist__add_default_attrs(). Other architectures can add
their own default events later separately.

With the patch:

 $ perf stat sleep 1

 Performance counter stats for 'sleep 1':

           0.82 msec task-clock:u              #    0.001 CPUs utilized
              0      context-switches:u        #    0.000 K/sec
              0      cpu-migrations:u          #    0.000 K/sec
             61      page-faults:u             #    0.074 M/sec
        319,941      cycles:u                  #    0.388 GHz
        242,802      instructions:u            #    0.76  insn per cycle
         54,380      branches:u                #   66.028 M/sec
          4,043      branch-misses:u           #    7.43% of all branches
      1,585,555      slots:u                   # 1925.189 M/sec
        238,941      topdown-retiring:u        #     15.0% retiring
        410,378      topdown-bad-spec:u        #     25.8% bad speculation
        634,222      topdown-fe-bound:u        #     39.9% frontend bound
        304,675      topdown-be-bound:u        #     19.2% backend bound

       1.001791625 seconds time elapsed

       0.000000000 seconds user
       0.001572000 seconds sys

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20210121133752.118327-1-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2021-02-03 13:10:43 -03:00
..
annotate perf annotate: Add 'ret' (intel disasm style) as an alias for 'retq' 2020-09-04 16:07:30 -03:00
entry/syscalls tools headers UAPI: Update epoll_pwait2 affected files 2020-12-24 09:24:19 -03:00
include perf tests tsc: Make tsc testing as a common testing 2020-11-04 09:42:40 -03:00
tests perf evlist: Use the right prefix for alternative 'struct evlist' constructors 2020-11-30 15:04:05 -03:00
util perf stat: Add Topdown metrics events as default events 2021-02-03 13:10:43 -03:00
Build perf tools: Rename build libperf to perf 2019-02-14 15:18:08 -03:00
Makefile perf tools: Move syscall_64.tbl check into check-headers.sh 2018-08-14 15:10:40 -03:00