[PATCH v3 0/8] perf session: Extend reader object to allow multiple readers

[Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>]

Changes in v4:
- set/unset active_decomp within reader__process_events

Changes in v3:
- removed struct reader_state in [PATCH v3 1/8]
- fixed repeating code in [PATCH v3 2/8]
- split [PATCH v2 4/5] to [PATCH v3 4/8], [PATCH v3 5/8]
- split [PATCH v2 5/5] to [PATCH v3 6/8] - [PATCH v3 8/8]

Changes in v2:
- introduced struct decomp_data suggested by Jiri Olsa
- removed unnecessary [PATCH v1 1/6]
- removed unnecessary extra line in [PATCH v2 4/5]
- removed unnecessary reader_state.eof flag in [PATCH v2 5/5]

Patchset moves state info and decompressor object into reader object
that made possible to split reader__process_events function into three
logical parts: init, map/unmap and single event reader which are used
in events reader loop. This approach allows reading multiple trace
files at the same time. 

The design and implementation are based on the prototype [1], [2].
The patchset was separated from [3].

Tested:

tools/perf/perf record -o prof.data -- matrix.gcc.g.O3
tools/perf/perf record -o prof.data -z -- matrix.gcc.g.O3
tools/perf/perf report -i prof.data
tools/perf/perf report -i prof.data --call-graph=callee
tools/perf/perf report -i prof.data --stdio --header
tools/perf/perf report -i prof.data -D --header

[1] git clone https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git -b perf/record_threads
[2] https://lore.kernel.org/lkml/20180913125450.21342-1-jolsa@kernel.org/
[3] https://lore.kernel.org/lkml/cover.1629186429.git.alexey.v.bayduraev@linux.intel.com/

Alexey Bayduraev (8):
  perf session: Move all state items to reader object
  perf session: Introduce decompressor in reader object
  perf session: Move init/release code to separate functions
  perf session: Move map code to separate function
  perf session: Move unmap code to reader__mmap
  perf session: Move event read code to separate function
  perf session: Introduce reader return codes
  perf session: Introduce reader EOF function

 tools/perf/util/session.c | 193 ++++++++++++++++++++++++++------------
 tools/perf/util/session.h |  10 +-
 2 files changed, 141 insertions(+), 62 deletions(-)

-- 
2.19.0