It looks like 2.6.37 made it out in time before I left for my trip, so here's some goodies to keep you all busy, from the emails I just sent to announce them on lkml:
These are patches designed to improve system responsiveness and interactivity with specific emphasis on the desktop, but suitable to any workload.
Apply to 2.6.37:
Broken out tarball:
All -ck patches:
Code blog when I feel like it:
Each discrete patch contains a brief description of what it does at the top of
the patch itself.
The most significant change is an updated BFS CPU scheduler, up to version
0.363. See the announce of that patch for the changelog. The rest is a resync.
The BFS (name shall not be said for PG requirements) CPU scheduler for 2.6.37
is now available.
Since the last release, a lot more work was put into maintaining fine grained
accounting at all times (which should help on 32 bit machines, uniprocessor
and 100Hz configs), minor changes have been made to make CPU offline code more
robust for the purposes of suspend to ram/disk, and some small scalability
improvements were added for SMT CPUs (eg i7). These changes are unlikely to
have dramatically noticeable effects unless you were already experiencing a
problem or poor performance.
A direct link to the patch for 2.6.37 is here:
All BFS patches here:
Version 363 has been ported to 2.6.35 and 2.6.32 and available from that
directory in lieu of the long term release nature of these kernels.
On a related note, a small multi-user server feature request was commissioned
for BFS that I was happy to work on, which I'd like to also make publicly
Here is the changelog:
Make it possible to proportion CPU resource strictly according to user ID by
grouping all tasks from the one user as one task.
This is done through simply tracking how many tasks from the one UID are
running at any one time and using that data to determine what the virtual
deadline is, offset by proportionately more according to the number of running
tasks. Do this by creating an array of every UID for very quick lookup of the
running value and protect it by the grq lock. This should incur almost
immeasurably small overhead even when enabled. An upper limit of 65535 UIDs
is currently supported.
Make this feature configurable at build time and runtime via Kconfig, and
through the use of sysctls
to enable or disable the feature (default 1 == on), and
to decide the minimum uid to group tasks from (default 1000)
Nice values are still respected, making it possible to allocate different
amounts of CPU to each user.
This feature is most suited to a multi-user shell type server environment and
is NOT recommended for an ordinary desktop.
The patch is available for the moment here:
A reminder that this is NOT a desktop, laptop or embedded device type feature.
The purpose of this feature is to make it impossible for any one user to get
more CPU than any other user on a multi-user login. This is suitable for
multiuser shared GUI/X session or shell type machines, and incurs almost
I'll be offline shortly and in Japan for a few weeks so I'll be unlikely to respond to any emails in that time.