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perf annotate-data: Add 'typecln' sort key

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Sometimes it's useful to organize member fields in cache-line boundary.

The 'typecln' sort key is short for type-cacheline and to show samples
in each cacheline.  The cacheline size is fixed to 64 for now, but it
can read the actual size once it saves the value from sysfs.

For example, you maybe want to which cacheline in a target is hot or
cold.  The following shows members in the cfs_rq's first cache line.

  $ perf report -s type,typecln,typeoff -H
  ...
  -    2.67%        struct cfs_rq
     +    1.23%        struct cfs_rq: cache-line 2
     +    0.57%        struct cfs_rq: cache-line 4
     +    0.46%        struct cfs_rq: cache-line 6
     -    0.41%        struct cfs_rq: cache-line 0
             0.39%        struct cfs_rq +0x14 (h_nr_running)
             0.02%        struct cfs_rq +0x38 (tasks_timeline.rb_leftmost)
  ...

Committer testing:

  # root@number:~# perf report -s type,typecln,typeoff -H --stdio
  # Total Lost Samples: 0
  #
  # Samples: 5K of event 'cpu_atom/mem-loads,ldlat=5/P'
  # Event count (approx.): 312251
  #
  #       Overhead  Data Type / Data Type Cacheline / Data Type Offset
  # ..............  ..................................................
  #
  <SNIP>
       0.07%        struct sigaction
          0.05%        struct sigaction: cache-line 1
             0.02%        struct sigaction +0x58 (sa_mask)
             0.02%        struct sigaction +0x78 (sa_mask)
          0.03%        struct sigaction: cache-line 0
             0.02%        struct sigaction +0x38 (sa_mask)
             0.01%        struct sigaction +0x8 (sa_mask)
  <SNIP>

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240819233603.54941-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2024-08-19 16:36:03 -07:00 • committed by Arnaldo Carvalho de Melo
commit fd45d52eae
3 changed files with 54 additions and 0 deletions
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