[Tarantool-patches] [PATCH v3 0/3] fiber.top(): minor fixup

[Serge Petrenko <sergepetrenko@tarantool.org>]

The first patch factors all the clock-related members of struct fiber and struct
cord into appropriate structs and adds methods for their updates and resets.

The second patch fixes exponential moving average calculation so that we do not
experience huge numbers in average load percentage calculations.

The third patch alters fiber.top() test to wait for correct output before
testing it. 

Follow-up https://github.com/tarantool/tarantool/issues/2694
Branch https://github.com/tarantool/tarantool/tree/sp/gh-2694-test-fixup

Changes in v3:
 - introduce a new patch which refactors all the clock stat
   handling.
 - introduce a patch fixing EMA calculation
 - review fixes as per review from Vladislav

Changes in v2:
 - clean up all fibers clock stats on fiber.top_enable()
 - push 0 instead of NaN when cord clock_delta_last is 0
 - review fixes as per review from Vladislav

Serge Petrenko (3):
  fiber.top() refactor clock and cpu time calculation
  fiber.top(): alter exponential moving average calculation
  app/fiber: wait till a full event loop iteration ends

 src/lib/core/fiber.c    | 175 ++++++++++++++++++++++++----------------
 src/lib/core/fiber.h    | 109 +++++++++++++++++--------
 src/lua/fiber.c         |  20 +++--
 test/app/fiber.result   |  38 ++++++---
 test/app/fiber.test.lua |  36 +++++++--
 5 files changed, 252 insertions(+), 126 deletions(-)

-- 
2.21.0 (Apple Git-122)