https://lists.busybox.net/pipermail/busybox/2006-August/057870.html
[PATCH/RFC] readahead applet
patchrfcreadaheadapplet
https://chromium.googlesource.com/aosp/platform/system/core/+/5c007a51dd05c44e5d6ad646a62eab5729c4e219/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp - aosp/platform/system/core -...
user spacemgrmergereadaheadcpp