Downloading the HLS module

First of all, download and unpack the linux 2.4.18 kernel, then apply our gensched patch, and finally configure and compile the kernel. When configuring the kernel, enable the ``GENERIC SCHEDULER'' option in ``Processor type and features''.

After that, uncompress the hls module sources, and enter in the ``hls/linux'' directory. Then, type

``make KERNEL_DIR=path where you uncompressed the linux kernel CLI=1''

to build the module.

The module can be built with different compilation options, which are passed to the Makefile by setting environment variables. In general, compiling with

``make OPT=1''

enables the compilation option ``OPT''. The following options are currently available

The ``CLI'' option must always be set (always compile with ``CLI=1'');
The ``MULDIV'' option allows to use an efficient implementation of 64 bits multiplications/divisions taken from RTAI. The module can compile on PPC only if MULDIV is set);
The ``INT_SCHED'' option compiles the Round Robin, Reservation, and Proportional Share schedulers and links them into the HLS module;
The ``CREATE'' option compiles in some code that automatically creates a simple schedulers' hierarchy when the module is loaded. Obviosly, this option can be enabled only if the ``INT_SCHED'' option has been enabled;
The ``DEBUG'' option permits to set the debug verbosity level. Use it only if you found some bug and you want to debug it, or if you want to send me a debugging log.

Other options are also available, but they should be used only in very special cases. Please, write me for more details.

The compilation process generates a file called hls_module.o, which can be inserted into the kernel. If you did not specify ``INT_SCHED=1'', you have to type

``make your options modules''

to compile the schedulers' modules (hls_sched_rr.o, hls_sched_res.o, and hls_sched_ps.o).

HLS currently works only on x86 (tested on UP athlon and pentium) and ppc (tested only on an iBook) machines.

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