D28555: File ioslave : use Better setting for sendfile syscall

[Méven Car]

meven created this revision.
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REVISION SUMMARY
  Changes :
  
  - use sendfile when copying file bigger than 2 GB
  - copy 512 kB instead of previously 32 kB for each sendfile copying iteration
  
  This effectively:
  1/ increase the copying speed, since the filesystem is asked to copy more at once, it lets it reach higher speed,
  2/ reduce the overhead of `processedSize` dbus progress notification in each iteration since it is called less often, adding some more speed.
  
  CCBUG: 342056
  CCBUG: 402276

TEST PLAN
  Copying large files or folders with medium sized files (for instance photos) is noticebly faster.

REPOSITORY
  R241 KIO

BRANCH
  sendfile-opt

REVISION DETAIL
  https://phabricator.kde.org/D28555

AFFECTED FILES
  src/ioslaves/file/file_unix.cpp

To: meven, #frameworks
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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