[PATCH 0/3] Add data type profiling support for powerpc

[Athira Rajeev]

From: Akanksha J N <Akanksha.J.N at ibm.com>

The patchset from Namhyung added support for data type profiling
in perf tool. This enabled support to associate PMU samples to data
types they refer using DWARF debug information. With the upstream
perf, currently it possible to run perf report or perf annotate to
view the data type information on x86.

This patchset includes changes need to enable data type profiling
support for powerpc. Main change are:
1. powerpc instruction nmemonic table to associate load/store
instructions with move_ops which is use to identify if instruction
is a memory access one.
2. To get register number and access offset from the given
instruction, code uses fields from "struct arch" -> objump.
Add entry for powerpc here.
3. A get_arch_regnum to return register number from the
register name string.

These three patches are the basic foundational patches.
With these changes, data types is getting identified for kernel
and user-space samples. There are still samples, which comes as
"unknown" and needs to be checked. We plan to get those addressed
in follow up. With the current patchset:

# ./perf record -a -e mem-loads sleep 1
# ./perf report -s type,typeoff --hierarchy --group --stdio
Snippet of logs:
#
# Total Lost Samples: 0
#
# Samples: 277  of events 'mem-loads, dummy:u'
# Event count (approx.): 149813
#
#            Overhead  Data Type / Data Type Offset
# ...................  ............................
#
    65.93%   0.00%     (unknown)
       65.93%   0.00%     (unknown) +0 (no field)
     8.19%   0.00%     struct vm_area_struct
        8.19%   0.00%     struct vm_area_struct +136 (vm_file)
     4.53%   0.00%     struct rq
        3.14%   0.00%     struct rq +0 (__lock.raw_lock.val)
        0.83%   0.00%     struct rq +3216 (avg_irq.runnable_sum)
        0.24%   0.00%     struct rq +4 (nr_running)
        0.14%   0.00%     struct rq +12 (nr_preferred_running)
        0.12%   0.00%     struct rq +2760 (sd)
        0.06%   0.00%     struct rq +3368 (prev_steal_time_rq)
        0.01%   0.00%     struct rq +2592 (curr)
     3.53%   0.00%     struct rb_node
        3.53%   0.00%     struct rb_node +0 (__rb_parent_color)
     3.43%   0.00%     struct slab
        3.43%   0.00%     struct slab +32 (freelist)
     3.30%   0.00%     unsigned int
        3.30%   0.00%     unsigned int +0 (no field)
     3.22%   0.00%     struct vm_fault
        3.22%   0.00%     struct vm_fault +48 (pmd)
     2.55%   0.00%     unsigned char
        2.55%   0.00%     unsigned char +0 (no field)
     1.06%   0.00%     struct task_struct
        1.06%   0.00%     struct task_struct +4 (thread_info.cpu)
     0.92%   0.00%     void*    
        0.92%   0.00%     void* +0 (no field)
     0.74%   0.00%     __int128 unsigned
        0.74%   0.00%     __int128 unsigned +8 (no field)
     0.59%   0.00%     struct perf_event
        0.54%   0.00%     struct perf_event +552 (ctx)
        0.04%   0.00%     struct perf_event +152 (pmu)
     0.20%   0.00%     struct sched_entity
        0.20%   0.00%     struct sched_entity +0 (load.weight)
     0.18%   0.00%     struct cfs_rq
        0.18%   0.00%     struct cfs_rq +96 (curr)

Thanks
Athira

Athira Rajeev (3):
  tools/perf/arch/powerpc: Add load/store in powerpc annotate
    instructions for data type profling
  tools/erf/util/annotate: Set register_char and memory_ref_char for
    powerpc
  tools/perf/arch/powerc: Add get_arch_regnum for powerpc

 .../perf/arch/powerpc/annotate/instructions.c | 66 +++++++++++++++++++
 tools/perf/arch/powerpc/util/dwarf-regs.c     | 29 ++++++++
 tools/perf/util/annotate.c                    |  5 ++
 3 files changed, 100 insertions(+)

-- 
2.43.0