Hi All,
I was wondering if somebody is following the on-going discussion
about exploiting the group scheduling[1] kernel feature (available
since 2.6.24) to increase "user desktop experience" (I'm not saying
that e17 is slow, on the contrary it makes bite the dust to gnome/kde
on my system :-).
Basically Mike Galbraith post a kernel patch [2] to lmkl
to implement automatic TTY-based group scheduling (see [3]
for a detailed discussion), .
In short, this patch automatically creates a group attached to each TTY
in the system. All processes with a given TTY as their controlling terminal
will be placed in the appropriate group; the group scheduling code can then
share CPU time between groups of processes as determined by their controlling
terminals.
During the aforementioned discussion Lennart Poettering post a
user space trick [4] to achieve the same behaviour without patching
the kernel.
This "trick" is simply a metter of adding 4 lines to your ~/.bashrc:
if [ "$PS1" ] ; then
mkdir -m 0700 /cgroup/cpu/$$
echo $$ > /cgroup/cpu/$$/tasks
fi
and add those 3 to your rc.local
mkdir -p /cgroup/cpu
mount -t cgroup cgroup /cgroup/cpu -o cpu
mkdir -m 0777 /cgroup/cpu
I've used it on my own system and I can say that it works
(if your work-flow involved quite often launching tasks
from a terminal).
Now I'm wondering if Everything could be modified in such a way
it could take the advantages of this kernel feature, providing an
interface to the user to group tasks based on some custom criteria
or simply automatically group task based on some defaults.
Obviusly if I had the C skill to do it by myself, I would bite...
but unfortunately it's not the case :P
Andrea
[1] http://lwn.net/Articles/240474/
[2] http://thread.gmane.org/gmane.linux.kernel/1062787
[3] http://lwn.net/SubscriberLink/415740/0b54c2b876c89d3a/
[4] http://thread.gmane.org/gmane.linux.kernel/1063263
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