Revert "Tweaks sustituidos por los del Lonas_KL"

This reverts commit 6d65cb409d26806925e93978baadd726bff0bf02.
Revert "Aumentado read_ahead Interno y Externo"

This reverts commit 48049999e52ea390a5b4a506b49c69811462b6f2.
Revert "Aumentado page-cluster"

This reverts commit e082c3516ea56c534b0e0dedd82a2e1d32f2a6e8.
Revert "swap: allow swap readahead to be merged"

This reverts commit c4094e5eac3a8df2a14cf2af78d332ad28c5189e.
Revert "mm: make swapin readahead skip over holes"

This reverts commit 7453138bc4671db91911339036054bcf09e06b2b.
Revert page_io