Sorry for a slightly off-topic post.
I'm currently investigating cpudyn[0], a nice simple userspace governor
that is fairly high in my powertop[1] interrupt source.
Code structure is fairly simple:
while(true) {
Read("/proc/stat");
ComputeLoad();
UpdateGovernor();
usleep(delay);
}
with delay being configurable, 100ms being the default.
Beside discussing whether 100ms is the appropriate delay, I'm wondering
whether there would be a nicer way to get periodic CPU time without
forcing a wake-up. Something like "call me every now and then, not
faster than x but not slower than y, at kernel's convenience".
It's the same basic idea than the 2.6.21 patch available at [2], but in
userland. Suggestions ?
Thanks,
Jean-Marc Ranger
[0] http://mnm.uib.es/gallir/cpudyn/
[1] http://linuxpowertop.org/
[2] http://linuxpowertop.org/patches/kernel-2.6.21.patch
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