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authorThomas Schwinge <tschwinge@gnu.org>2008-11-19 15:54:07 +0100
committerThomas Schwinge <tschwinge@gnu.org>2008-11-19 15:54:07 +0100
commit1de4ec0bcfad92dfa0b7cf69919d56c0dca4cb7a (patch)
treedf1d22d227cacf7ce981448ea9c148c60c72f80c /microkernel/mach/gnumach/projects.mdwn
parent306cbd9d3afc7619bbaef2d14123f6a693802980 (diff)
Revert "microkernel/mach/gnumach -> microkernel/mach/gnu_mach"
This reverts commit ae9e4e22a7ce8b2b56e98ff1708c2e8d42eefd69. I've changed my mind again. Also resolve conflicts and adapt all new uses of the path.
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+[[meta copyright="Copyright © 2005, 2006, 2007, 2008
+Free Software Foundation, Inc."]]
+
+[[meta license="""[[toggle id="license" text="GFDL 1.2+"]][[toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled
+[[GNU_Free_Documentation_License|/fdl]]."]]"""]]
+
+This page is a place to keep track of ideas about things that may be improved
+in GNU Mach, so that it'll evolve to a reliable microkernel for The Hurd, both
+in terms of stability and performance. If you find anything missing here,
+please feel free to add a entry with a short description.
+
+If you want to help with any of the task (thanks!), please send a mail to
+*[[mailing_lists/bug-hurd]]* stating what task you wish to work on,
+so that no duplicate efforts end up.
+
+# Active Branches
+
+ * `gnumach-1-branch` is the main branch.
+
+ * `gnumach-1-branch-Xen-branch` is a branch created by Samuel Thibault for
+ working on a [[ports/Xen]] port.
+
+ * `gnumach-1-branch-gdb-branch` is a branch created by Michael Casadevall for
+ working on [[GDB_stubs]].
+
+
+# Task List
+
+ * [[Clean_up_the_code]]
+
+ * [[Open_Issues]]
+
+ * Update the core architecture and drivers
+
+ * Check what NetBSD, FreeBSD and Linux do with their host specific code
+ (i486, PPC, Sparc, ...). And if it might be wise to take that and use
+ it in GNU Mach. There is no need to worry about purely internal API's,
+ but the external ones shouldn't require any major changes.
+
+ * Write a list of all functions provided by the host dependant code in
+ GNU Mach that gets used in the non-host specific code (kernel, IPC and
+ VM).
+
+ * Once we have decided what the new internal API should look like, make a
+ list of the new API and the old one, and try to make things as
+ compatible as possible, but not at the expense of anything.
+
+ * Implement Migrating Threads
+
+ * Migrating Threads (MT) could improve IPC performance and making easier
+ the work of the scheduler. For more information, check
+ <http://www.usenix.org/publications/library/proceedings/sf94/ford.html>
+
+ * Improve the external pagers interface
+
+ * Implement read-ahead (huge I/O improvements expected).
+
+ * Making this interface synchronous should improve I/O performance
+ significantly, without (almost) any drawbacks (we also get some
+ advantage from MT's).
+
+ * Implement more paging eviction policies, so they fit better with usual
+ behaviour of the pagers.
+
+ * Implement resource accounting for external pagers.
+
+ * VM
+
+ * Put it on user level (?)
+
+ * Clean up the mess.
+
+ * Provide a fast way to read/write from/to a memory object.
+
+ * Simplify/normalise the code.
+
+ * Simplify the IPC Semantics
+
+ * There are a lot of things in GNU Mach's IPC that we don't need. Track
+ down those things, and get rid of them without requiring many changes
+ in the Hurd (the changes will affect MiG, but that is OK).
+
+ * Temporary mappings for Client-Server memory transfers
+
+ * Extend Mach's IPC to provide some kind of object which can represent a
+ range of memory that can temporarily be mapped into the servers address
+ space for sending/receiving data. This would allow us to avoid
+ excessive memory copies.
+
+ * Find a new way to work with unaligned memory.
+
+ * GDB remote debugging support
+
+ * Implement support for GDB debugging via serial line and/or network.
+ Maybe this can be done together with the host-specific work above.
+
+ See [[GDB_stubs]].
+
+ * Make it run as a [[UNIX]]/Linux executable.
+
+ * Neal:
+
+ <neal> here's a fun project: port the mach interface to Linux
+ <neal> (e.g., via kernel modifications)
+ <neal> or, to posix/glibc
+ <neal> (mmap, some minimal ptrace, etc.)
+
+ * From the [Hurd bits at
+ sourceforge.net](http://sourceforge.net/projects/hurd):
+ <http://hurd.cvs.sourceforge.net/hurd/gnumach-otop/>, started by John
+ Tobey. Last time touched in 2003. Status completely unknown.
+
+ * [README](http://hurd.cvs.sourceforge.net/hurd/gnumach-otop/README?view=markup)
+
+
+# Wish List
+
+ * Interface for userspace non-critical drivers.
+
+ * Sound Support
+
+ * WLAN support (ipw2200) with WEP/WPA
+
+ * ACPI support