Change Details

This will keep the code of the following changes simpler to read. It introduces no functional change.

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.

This will keep the code of the following changes simpler to read.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, It introduces no functional changeand leave system cache and memory for interactive performance.