SCHED: Disable GENTLE_FAIR_SLEEPERS
 Asynchronous I/O latency to a solid-state disk greatly increased
sync.c: add a module_param to fsync() calls. fsync is still disabled by default but users will have the choice of having a faster build or a safer build (for data integrity). Props for simms for busting my ass off with this one :)
block: row: hardcode values research by the community, you guys know who you are.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
block: row: this should be 2.

Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
mm.h: hardcode readahead to 2048Kb

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>