Michael Opdenacker contributed a readahead applet.
diff --git a/miscutils/Config.in b/miscutils/Config.in
index 4296b54..9ad3421 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -276,6 +276,22 @@
to advance or rewind a tape past a specified number of archive
files on the tape.
+config CONFIG_READAHEAD
+ bool "readahead"
+ default n
+ help
+ Preload the files listed on the command line into RAM cache so that
+ subsequent reads on these files will not block on disk I/O.
+
+ This applet just calls the readahead(2) system call on each file.
+ It is mainly useful in system startup scripts to preload files
+ or executables before they are used. When used at the right time
+ (in particular when a CPU boundprocess is running) it can
+ significantly speed up system startup.
+
+ As readahead(2) blocks until each file has been read, it is best to
+ run this applet as a background job.
+
config CONFIG_RUNLEVEL
bool "runlevel"
default n