[Tarantool-patches] [PATCH luajit v3 0/4] sysprof: parser refactoring

[Maxim Kokryashkin]

This patchset is targeted at reducing the memory footprint
of the sysprof parser. It is mainly achieved by fixing a
nasty bug in the AVL tree implementation, which caused most
of the memory consumption, and by essentially purging the collapse.lua
module, which means that there is no need to store the complete
information about every parsed event and it is sufficient to merge
stacks inplace.

Alongside with described changes two minor improvements were done:
- `luajit-parse-sysprof` now has permissions to be executed
- `split_by_vmstate` option is purged, because no one uses it, so there
  is no actual reason to maintain it.

## Note for Igor:
There is no way to split the 'memory footprint reduction'-part and the
'collapse.lua purge'-part, since the main reason why memory consumption
is so much lower now, other the AVL-tree bug, is that we don't need to
pass a complete profile information between the `parse.lua` and
`collapse.lua`. That, basically, almost turns the profile parsing
process into some kind of stream-based procedure.

PR: https://github.com/tarantool/tarantool/pull/8703
Branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-8700-sysprof-parser-refactoring

Maxim Kokryashkin (4):
  utils: remove unnecessary insertion in AVL-tree
  sysprof: remove `split by vmstate` option
  tools: add execution permission to sysprof parser
  sysprof: improve parser's memory footprint

 .../gh-5813-resolving-of-c-symbols.test.lua   |   6 +-
 tools/CMakeLists.txt                          |   4 +
 tools/luajit-parse-sysprof.in                 |   0
 tools/sysprof.lua                             |  28 +---
 tools/sysprof/collapse.lua                    | 127 +-----------------
 tools/sysprof/parse.lua                       | 126 ++++++++++++-----
 tools/utils/avl.lua                           |   4 +-
 tools/utils/symtab.lua                        |   2 +-
 8 files changed, 106 insertions(+), 191 deletions(-)
 mode change 100644 => 100755 tools/luajit-parse-sysprof.in

-- 
2.41.0