D24540: [Database] Disable read-ahead to reduce thrashing

[Kai Krakow]

hurikhan77 created this revision.
hurikhan77 added a reviewer: ngraham.
hurikhan77 added a project: Baloo.
Herald added a project: Frameworks.
Herald added subscribers: Baloo, kde-frameworks-devel.
hurikhan77 requested review of this revision.

REVISION SUMMARY
  Prevent filesystem thrashing in low-mem situations by turning off
  read-ahead. Access patterns of baloo are unlikely to benefit from
  read-ahead and preserving cache is more valuable than reading ahead
  potentially unused data.
  
  In low-memory conditions, the random access patterns of Baloo combined
  with read-ahead tend to dominate the cache. Let Baloo be the slow player
  here, and leave system cache and memory for interactive performance.

REPOSITORY
  R293 Baloo

REVISION DETAIL
  https://phabricator.kde.org/D24540

AFFECTED FILES
  src/engine/database.cpp

To: hurikhan77, ngraham
Cc: kde-frameworks-devel, ngraham, #baloo, lots0logs, LeGast00n, fbampaloukas, GB_2, domson, ashaposhnikov, michaelh, astippich, spoorun, bruns, abrahams
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