Linux Kernel Patches I've Written

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Patches for the 2.5.x series kernel. These are kept here.

• Device FileSystem (devfs). The documentation is enclosed in the patch. The patch is against the latest kernel and includes fixes and new features. There is also a FAQ which explains the reasons and implementation.
  There is also an associated daemon for configurable management of device nodes available as a gzipped tarfile.

Patches for the 2.4.x series kernel. These are kept here.

• Device FileSystem (devfs). The documentation is enclosed in the patch. The patch is against the latest kernel. There is also a FAQ which explains the reasons and implementation. Kernel 2.3.46 has included devfs-patch-v158, so it's now official :-)
  Subsequent devfs patches will include fixes and new features against recent kernels.
  There is also an associated daemon for configurable management of device nodes available as a gzipped tarfile.

Patches for the 2.2.x series kernel. These are kept here.

• Device FileSystem (devfs). The documentation is enclosed in the patch. The patch is against the latest kernel. There is also a FAQ which explains the reasons and implementation. This will probably go in during the 2.3 kernel cycle. There is also an associated daemon for configurable management of device nodes available as a gzipped tarfile.
• Driver to provide access to Model-Specific Registers (MSRs) and Performance Monitoring Counters (PMCs). The documentation is enclosed in the patch. The patch is against the latest kernel and requires the devfs patch mentioned above. Some basic documentation is available here. You can download a set of utilities and a programming library which uses the kernel interface from here. This patch has grown to include an ioctl() to convert virtual addresses to physical addresses and to enable page colouring for a specified process.
• An update patch for the MTRR code in the 2.2 kernel. This improves the code and adds support for non-Intel CPUs.
• A patch to place real-time (RT) processes on a separate run queue. This further isolates RT processes from normal processes and hence provides faster and more deterministic context switch times for RT processes.
  Some of the issues are discussed here. This should be included in kernel 2.3.

Patches for the 2.1.x series kernel. These are kept here.

• Device FileSystem (devfs). The documentation is enclosed in the patch. The patch is against the latest kernel. There is also a FAQ which explains the reasons and implementation. This will probably go in during the 2.3 kernel cycle. There is also an associated daemon for configurable management of device nodes available as a gzipped tarfile.
• New scheme to optimise select(2) and poll(2) by a factor of 3. readme file and compressed patch file
• /proc/mtrr driver to enable control of MTRR's. readme file and compressed patch file. This patch also fixes broken SMP BIOSes which do not synchronise MTRRs across all CPUs. Included in recent kernels. Mathias Froehlich has written a patch for 2.0.3x which has a similar BIOS fix (it doesn't provide a /proc/mtrr interface), which you can get from here.
• Patch to enable mounting of filesystems so that directory access times are not written to disc. compressed patch file. Included in recent kernels.
• Patch to place real-time (RT) processes on a separate run queue. This further isolates RT processes from normal processes and hence provides faster and more deterministic context switch times for RT processes. patch file. Some of the issues are discussed here. This should be included in kernel 2.3.

Patches for the 2.0.x series kernel. These are kept here.

• Improve the performance of the select(2) system call. readme file and compressed patch file