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/

Additional notes


CategoryTODO

VMIO_Concurrency (last edited 2013-12-30 20:55:22 by AlexanderMotin)