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8c0cdf29 1# DragonFly Projects
b790f880 2
8c0cdf29 3This page shall serve as a common place to look if you're in search of a DragonFly related project. It's also the place to check if someone else is already working on it (to prevent project collision) or should be contacted.
b790f880 4
b1b401e0 5Projects that can be clearly used for Google Code-In are marked with their category, where applicable. Some unmarked items may be eligible; it depends on how the student wants to tackle the project.
6
8c0cdf29 7[[!toc levels=3 ]]
b790f880 8
8c0cdf29 9## Website projects
b790f880 10
06d07101 11### One-liners
b1b401e0 12* Add traffic report, especially to lists requests that cause 404s (GCI:Research)
13* Add the mail archive to the search index (GCI:Documentation)
14* Download link right on the main page.
8753e704 15* Fix RSS feed to have correct links
b1b401e0 16* Create layout for http://bugs.dragonflybsd.org that matches the main site. (GCI:User Interface)
8753e704 17* Create short list of tasks for a new DragonFly user
b1b401e0 18* How to upgrade the operating system (GCI:Training)
19* How to get to a working desktop (GCI:Training)
20* and where and how to report issues.(GCI:Documentation)
06d07101 21
22### Post papers in the proper locations on the website
8753e704 23* Format conversion may be necessary
24* Aggelos's papers from [http://leaf.dragonflybsd.org/~aggelos/] (http://leaf.dragonflybsd.org/~aggelos/) (netmp-paper.pdf and netmp.pdf) to Presentations
25* ["A Peek at the vKernel" article](http://cvsweb.dragonflybsd.org/cvsweb/site/data/docs/articles/vkernel/vkernel.shtml?rev=1.3&content-type=text/x-cvsweb-markup) from old site
b1b401e0 26(GCI:Documentation)
b790f880 27
8c0cdf29 28## Documentation projects
b790f880 29
06d07101 30### One-liners
8753e704 31* Reorder `/usr/src/UPDATING` to put more relevant information at top; remove data no longer relevant.
32* Help out in [http://bugs.dragonflybsd.org](http://bugs.dragonflybsd.org) (try to reproduce, diagnose, propose fixes ...)
33* Organize, contribute to, and finish the C book project.
06d07101 34
35### Handbook maintenance
8753e704 36* Check if the content applies to DragonFly. If not, change it.
37* Add new content and enhance the previous chapters
b1b401e0 38* Check for syntax error, typos and wiki errors.
39* Add prev/next buttons to all pages. (GCI:User Interface)
40
193c08af 41
87bf445d 42### Write manpages
b1b401e0 43* sysref (GCI:Documentation or Research)
87bf445d 44
8c0cdf29 45## Userland projects
b790f880 46
06d07101 47### One-liners
8753e704 48* Update the [[contributed software|docs/user/ContribSoftware]] which is out-of-date.
49* Remove `NOINET6` build option
b1b401e0 50* `WARN` corrections to utilities (GCI:Code)
8753e704 51* Bring in code from other *BSDs:
b1b401e0 52* smbfs changes from FreeBSD (GCI:Code)
8753e704 53* Add extended slice support to `fdisk`
54* Install Coverity and fix the FreeBSD bugs that were uncovered by Coverity, but do not just blindly pull over the FreeBSD patches. Make sure that you first understand what the patch does.
b1b401e0 55* C99 Standards Conformance. The todo list is on [[/docs/developer/StandardsConformanceProject]] (GCI:Code)
56* Setup a regression testing machine/system to register and find problems and new improvements. (GCI:Quality Assurance)
57* Networking performance / scalability ((GCI:Research)
58* [[RegressionTest|/docs/developer/RegressionTest]] (GCI:Research)
59* also check [[HowToStressTest|/docs/developer/HowToStressTest]] (GCI:Research)
8753e704 60* Add lwp support to ptrace/gdb/core dumps.
8753e704 61* Bringing in version 2.0 of the BSD Installer
62* UTF8 support in the console
06d07101 63
b1b401e0 64### Scalability (algorithmic performance) (GCI:Research)
65* [http://bulk.fefe.de/scalability/](http://bulk.fefe.de/scalability/)
8753e704 66* [http://bulk.fefe.de/lk2006/talk.pdf](http://bulk.fefe.de/lk2006/talk.pdf)
06d07101 67
4e927740 68### Clean our code to make it [style(9)](http://leaf.dragonflybsd.org/cgi/web-man?command=style&section=ANY#style&sectionANY) compatible. (GCI:Code)
8753e704 69* Compile and test your changes.
b1b401e0 70* Verify that the checksum (sha(1)) of the unmodified object matches the checksum of the cleaned object. Check also with strip(1)+sha(1)
06d07101 71
b1b401e0 72### Port BSD-licensed tools (ex: `grep`, `diff` and `sort`) (GCI:Code)
8753e704 73* The OpenBSD guys already did some work related to that.
74* If you manage to bring the tools to DragonFly, check if everything works as expected (e.g. rc.d scripts, make world runs, ...).
75* The new tools need to have at least all the features of the old GNU tools.
06d07101 76
77### Randomize mmap() offsets
8753e704 78* [http://www.openbsd.org/papers/ven05-deraadt/index.html](http://www.openbsd.org/papers/ven05-deraadt/index.html)
06d07101 79
99e24f21 80### GDB
8753e704 81* ptrace/gdb follow-fork-mode support and more (peek at linux)
82* Change the build to create one libbfd for gdb and binutils
83* Separate RPC code from NFS into separate library.
84
85### I/O diagnostic utilities
86* A utility similar to top which displays I/O usage on a per-process basis
87* Network, Disk
8c0cdf29 88
05f26292 89### SMART capabilities
90* Add to natacontrol (see NetBSD's atactl?)
91* Add to camcontrol
92
b1b401e0 93### Disk scheduling rc scripts (GCI:Code)
05f26292 94* Create a rc script to manage the disk/io scheduling system
95* Perhaps 1 entry to "enable" it, and all disks will have mode set to "auto", in auto mode smart inquiries and other heuristics could attempt to determine the best i/o scheduler
96* Per-device and device class or similar defaults should be definable in rc.conf also
dcf86f60 97* The bulk of this functionality could be implemented in a resurrected "dschedctl" utility and exposed through the rc interface using just a thin wrapper, allowing hotplug scripts and etc. an easier option to use the same facilities.
05f26292 98
b1b401e0 99### libHAMMER
3eda57ef 100* HAMMER has the capability to expose very rich information to userland through ioctl's.
101* Currently the hammer(8) utility makes use of this information in an ad-hoc manner.
102* Port this core functionality into a public libhammer library so that other base and third party utilities may take advantage of it.
947d3e3a 103* See commit: cb7575e6a89409a2041a37fcfc22ce9e41297ab8
3eda57ef 104
8c0cdf29 105## Kernel projects
106
06d07101 107### One-liners
8753e704 108* Port the BSDL OSS code to DragonFly
109* Complete Path MTU Discovery by adding a host route to remember the Path MTU and setting a timer to expire old host routes. See netinet/if_ether.c for an example of this mechanism as used by ARP. Periodically increase MTU of hosts that have had its MTU decreased.
110* Look for places in the kernel that can benefit from Solaris-style caching of preconstructed slab allocator objects. If we can find enough of these uses, we can add this functionality to the kernel memory allocator.
b1b401e0 111* Implement [`sem_open()`](http://www.opengroup.org/onlinepubs/000095399/functions/sem_open.html), [`sem_close()`](http://www.opengroup.org/onlinepubs/000095399/functions/sem_close.html), and [`sem_unlink()`](http://www.opengroup.org/onlinepubs/000095399/functions/sem_unlink.html). (GCI:Code)
8753e704 112* Clean our code to make it [style(9)](http://leaf.dragonflybsd.org/cgi/web-man?command#style&sectionANY) compatible. Compile and test your changes. Verify that the checksum (sha(1)) of the unmodified object matches the checksum of the cleaned object. Check also with strip(1)+sha(1)
b1b401e0 113* Setup a regression testing machine/system to register and find problems and new improvements. (GCI:Research)
8753e704 114* Port or update drivers from other systems.
115* Port NFSv4. [This mail](http://leaf.dragonflybsd.org/mailarchive/kernel/2008-01/msg00065.html) is a good starting point.
8753e704 116* clean up buildworld/kernel compilation warnings
8753e704 117* Port DTrace
52dfca9b 118* Port Linux emulation to x86-64
06d07101 119
120### Code to port/sync from FreeBSD
8753e704 121* PCI code (to take advantage of power saving features)
b1b401e0 122* Bring in support for UFS2, just the changes to extend the width of some fields from 32 bits to 64 bits. (GCI:Code)
123* hardware drivers.
99e24f21 124
06d07101 125### Code to port/sync from OpenBSD
8753e704 126* Add support for the NoExecute bit as described in [http://www.openbsd.org/papers/auug04/index.html](http://www.openbsd.org/papers/auug04/index.html).
127* After that, make user stacks and data heaps non-executable. (W^X)
128* hardware drivers, specially wireless.
06d07101 129
df817d42 130### CPU scheduler
8753e704 131* A scheduler API supporting multiple scheduler implementations already exists
132* Add a Solaris-like dispatcher framework that can handle more than one installed scheduling policy
06d07101 133
134### I/O scheduler
df817d42 135* A pluggable kernel I/O scheduler already exists
136* Implement additional disk scheduling policies
8753e704 137
43da2530 138### Implement boot cache
139* Effectively a smart readahead.
947d3e3a 140* Store the pattern of incoming read requests of the boot disk. (Likely into an array structure for better linear readback, We mmap() the whole thing into RAM on boot.)
43da2530 141* Sort pattern into a playback list. (Burstsort or a simple quick sort to get things going?)
142* Provide feedback of boot cache playback list hit rate for better adaptiveness.
143
c1941460 144### Improve kernel boot speed
145* Research source of delays in boot process, keyboard init, scsi?
146* Better thread some hardware init, for example USB?
147* Perhaps look to see how Linux can boot in one second, better pci scan code?
ab4ba9d2 148* "Some kernel work made it possible to do asynchronous initialization of some subsystems. For example, the modified kernel starts the Advanced Host Controller Interface (AHCI) initialization, to handle storage, at the same time as the Universal Host Controller Interface (UHCI), in order to handle USB" - http://lwn.net/Articles/299483/
c1941460 149
b1b401e0 150### Modify firmware framework
1ac22aa1 151* We currently use the firmware(9) FreeBSD also uses
152* It would be more appropriate to avoid future problems with redistribution problems, etc, to adapt the wifi firmware stuff to use the firmware(9) we used to have before, which was able to load firmware files from userland (/etc/firmware).
153* See "firmware discussion" thread on kernel@ mailing list, March-May 2010.
ca622843 154* Since it's not desired to just add another way of doing it, this project should include getting rid of loading firmwares as modules
1ac22aa1 155
8753e704 156### Work relating to LWKT (LightWeightKernelThreading)
157* Implement lazy IPI cross-processor lwkt message passing.
158* Add timeout functionality to lwkt_waitmsg().
159* Write man pages for the lwkt message passing API.
160
161### Filesystem extended attributes
162* Generic VFS attributes layer
163* Emulate attributes ala Darwin
164* Allow filesystems to define their own attribute vop ops
165* QUESTIONS: Attributes or subfiles? The consensus is that subfiles are better?
166
b6a0e48f 167### Capabilities
168* Implement something resembling or inspired by POSIX.1e
169* This implementation could possibly exist in userland and interlock with the kernel via a VFS Journal or HAMMER mirroring ioctl's.
170* These should be capable of supporting NFSv4 capabilities.
171* References: [1](http://leaf.dragonflybsd.org/mailarchive/kernel/2006-07/msg00012.html)
172
8753e704 173### Hardware virtualization extensions
174* Increase performance of virtual kernels
175* Make use of hardware virtualization extensions, if supported, to manage vmspaces
0b48e63b 176* Implement a KVM-compatible virtualization device to support qemu
8898930f 177* Hardware IOMMU support is not a priority and if implemented must be strictly optional.
8753e704 178
f1dc70a1 179### Remove zalloc
180* zalloc is a deprecated kernel interface and all current consumers can be ported to objcache, with varying levels of difficulty.
48b27198 181* zlib, pv entries
f1dc70a1 182* Once all consumers are ported, zalloc can be removed.
97f327a5 183
b6a0e48f 184### Document all sysctl's
185* The description of sysctl's can be provided when the sysctl is declared and displayed in userland by passing the -d flag to the sysctl utility.
186* Document all undocumented sysctl's
187* Verify that the description of documented sysctl's is correct.
188
189### Convert kprintf-enabling sysctl's to KTR's
190* Many sysctl's simply enable one or more kernel kprintf's
191* This can be very easy, or can be very unwieldy
192* Convert all of these cases to ktr's, while slightly less easy they are far easier to wield in all cases.
193
b1b401e0 194### Tear out C/H/S disk reporting (GCI:Research)
bd0ac588 195* Cylinders/Heads/Sectors are an outdated concept and the system doesn't rely on them anymore.
196* Verify the assumption that we don't rely on them in any way, shape or form.
197* Tear the reporting out of the kernel/installer/etc.
198
e2952a1f 199### Change vm_map lookup algorithm
200* The vm_map lookups currently use a Red-Black tree, since 2005.
201* It has been decided that using an array'ized bucket'ized hash table is probably a better approach.
202* References: [1](http://kerneltrap.org/mailarchive/freebsd-current/2010/10/1/6260944) [2](http://leaf.dragonflybsd.org/mailarchive/kernel/2005-01/msg00122.html)
97f327a5 203
0422aa9f
M
204### Trampoline Code Page instead of direct syscalls
205* Map a read/execute trampoline page into every process, which has a syscall table, i.e. is used instead of "int" to enter the kernel. This way we can easily change the kernel enter method from "int" to e.g. "sysenter" without having to recompile userland applications, or even implement some syscalls in userspace.
206
207### Compressed in-memory swap device
208* A device that uses physical memory as swap space, but compresses it.
209* Do we support stacking of swap space? For example, one would have this compressed in-memory swap device with highest priority. Replaced objects will be put into the next priority swap device (e.g. a SSD), and so on.
210
fa076070 211### tmpfs allocations from swap
212* Currently, tmpfs nodes and stuff are allocated from KVA are the size limiter for a tmpfs filesystem
213* Instead allocate them from swappable memory; this will allow larger tmpfses up to swap limits
214
3114c38f 215### mmap MAP_ALIGN
216* Solaris's mmap support a flag, MAP_ALIGN, where the address to mmap acts as an alignment hint
217* Our backing VM calls support an alignment parameter, but our public mmap does not
218* This would allow nmalloc to allocate slabs (64k, 64k-aligned) without wastage
219
fb27736e 220### vnode dumps
221* It would be beneficial to be able to have crash dumps written to an ordinary file in configurations where swap is not configured.
222
af80ec85 223### Kernel allocator feature enhancements
224* Enhance objcache in a manner that will allow the initialization to specify allocation functions which will allocate and free entire slabs of memory, not just single objects.
60f380f8 225* Rework the kmalloc allocator to sit on top of objcache (there are various dependencies to making this work).
226* Create or sort out a metric for vnode/other cache object cycling rate that can indicate realistic memory pressure.
227* Clear out free objcache slabs under memory pressure.
228* Add reclaim functionality to objcache, such that it may ask consumers to free objects back into it under memory pressure.
af80ec85 229
fb27736e 230
97f327a5 231For more theoretical projects and project concepts see [[ResearchProjects|/docs/developer/ResearchProjectsPage]]