VM-I/O concurrency project for FreeBSD 10.0-Release
This page documents proposed task-list for improving VM subsystem and I/O stack concurrency and performance to be delivered in FreeBSD 10.0-Release. Everyone is encouraged in modifying the page adding more tasks, submitting his name under projects to be completed and offer guidance, review and testing for any of these items.
Tasklist targeted for FreeBSD 10.0-R
Task |
Responsible |
Last update |
Scope (Effort) |
Status / % complete |
Location of branch |
Multi-digit trie and use it for resident and cached pages within vm_objects |
attilio |
03/17/2013 |
|
Completed (r248449 et al.) |
|
Unmapped I/O |
jeff, kib |
03/18/2013 |
|
Completed (r246713,248280 et al.) |
|
radix tree for buf cache |
jeff |
04/29/2013 |
|
Completed |
|
vfs_bio.c mtx contention bqlock |
jeff |
03/10/2013 |
|
Completed |
|
Fine-grained locking for pv lists |
alc |
06/03/2013 |
|
#FineGrainedPvListsPmap 75% Complete (r235695, r237228, r237290, r237551, r237592) |
|
Shared locking for vm_objects lock |
attilio, alc |
12/21/2012 |
|
In progress |
svn://svn.freebsd.org/base/user/attilio/vmobj-readlock/ |
Fine-grained locking for active and inactive page queues |
alc, kib |
12/21/2012 |
|
In progress |
https://www.kib.kiev.ua/git/gitweb.cgi?p=deviant2.git;a=shortlog;h=refs/heads/nofault |
Fine-grained locking for free pages queue |
alc, jeff |
12/21/2012 |
|
In progress |
|
Improved kernel NUMA support |
jeff, alc, attilio |
12/21/2012 |
|
In progress |
|
Tasklist targeted after FreeBSD 10.0-R
Task |
Responsible |
Last update |
Scope (Effort) |
Status / % complete |
Location of branch |
Unmapped I/O exploiting by non-critical CAM drivers |
??? |
12/21/2012 |
|
|
|
Implement userland NUMA support |
jeff, alc, attilio |
12/21/2012 |
|
Unstarted |
|
GEOM multi-threading dispatching |
mav |
10/22/2013 |
|
Completed (r256880+) |
|
Revisit GEOM BIOs copy overhead |
pjd |
12/21/2012 |
|
Unstarted |
|
SMP CAM/CAM multithreading - Fix CAM consumers to not assume GEOM single-threading |
mav |
10/21/2013 |
|
Completed (r256843+) |
|
so_snd/so_rcv contention |
??? |
03/10/2013 |
|
Unstarted |
|
umtx/pthread overhaul |
attilio, davide |
03/22/2013 |
|
Unstarted |
|
unmapped mbufs |
jeffr |
NA/NA |
|
Unstarted |
|
Task breakdowns
Shared locking for vm_objects lock
Task |
Responsible |
Last update |
Scope (Effort) |
Status / % complete |
Location of branch |
Rewrite the page struct/data protection mechanism |
attilio |
06/04/2013 |
2 |
awaiting reviews |
svn://svn.freebsd.org/base/user/attilio/vmobj-readlock/ |