D9840: Tentative patch to reduce I/O overhead of plasmashell when copying files

[Jaime Torres Amate]

jtamate created this revision.
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REVISION SUMMARY
  kservice uses kdirwatch to be notified when one of the directories containing it's source of information changes.
  But also the method TimestampChecker().checkTimestamps(allResourceDirs) is called once every 1500 miliseconds.
  When copying files from any directory to another one, this check introduces a big use of io/wait.

TEST PLAN
  Before, when copying 20Gb files, the cpu spent in io/wait, as seen by ksysguard, was around 80%.
  After, when copying 20Gb files, the cpu spent in io/wait, as seen by ksysguard, is around 50%

REPOSITORY
  R309 KService

REVISION DETAIL
  https://phabricator.kde.org/D9840

AFFECTED FILES
  src/sycoca/ksycoca.cpp

To: jtamate, #frameworks
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