[PATCH v2 0/4] perf: improve script and record for iregs and brstack

[Stephane Eranian]

This short series of patches improves perf record and perf script support
for interrupted machine state and branch stack.

this makes it easier to postprocess the data and narrow down the volume
and limit the overhead of capturing interrupt machine state registers.
For some analysis, only a subset of the registers is useful.

Changes:
   - Make --intr-regs accept register names to limit volume of data collected
   - Make perf script print interrupted machine register values with -F iregs
   - Make perf script print branch stack content with -F brstack

   $ perf record --intr-regs=\?
   available registers: AX BX CX DX SI DI BP SP IP FLAGS CS SS R8 R9 R10 R11 R12 R13 R14 R15 
   ...

   $ perf record --intr-regs=ax,bx,cx,dx,si ....

   $ perf script -F ip,iregs
   40afc2   AX:0x6c5770    BX:0x1e    CX:0x5f4d80a    DX:0x101010101010101    SI:0x1

   $ perf script -F ip,brstack
   5d3000 0x401aa0/0x5d2000/M/-/-/-/0 ...

 $ perf script -F ip,brstacksym
  4011e0 noploop+0x0/noploop+0x0/P/-/-/0

In V2, perf script adds brstacksym option to print the branch stack using symbolic names
for the from and to addresses. The brstack prints only raw addresses. For each entry,
the branch stacks flags are decoded, including the latency for Skylake systems.
The patch is rebased to tip.fit 4.2.0-rc7.

Stephane Eranian (4):
  perf script: enable printing of interrupted machine state
  perf/x86: add list of register names
  perf record: add ability to name registers to record
  perf script: enable printing of branch stack

 tools/perf/Documentation/perf-record.txt |   6 +-
 tools/perf/Documentation/perf-script.txt |  14 +++-
 tools/perf/arch/x86/util/Build           |   1 +
 tools/perf/arch/x86/util/perf_regs.c     |  31 +++++++++
 tools/perf/builtin-record.c              |   7 +-
 tools/perf/builtin-script.c              | 111 ++++++++++++++++++++++++++++++-
 tools/perf/perf.h                        |   2 +-
 tools/perf/util/Build                    |   1 +
 tools/perf/util/evsel.c                  |   2 +-
 tools/perf/util/parse-regs-options.c     |  71 ++++++++++++++++++++
 tools/perf/util/parse-regs-options.h     |   5 ++
 tools/perf/util/perf_regs.h              |   7 ++
 12 files changed, 250 insertions(+), 8 deletions(-)
 create mode 100644 tools/perf/arch/x86/util/perf_regs.c
 create mode 100644 tools/perf/util/parse-regs-options.c
 create mode 100644 tools/perf/util/parse-regs-options.h

-- 
1.9.1

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