Linux semaphores

Re: Schedule idle
MOLNAR Ingo (mingo@chiara.csoma.elte.hu)
Wed, 11 Nov 1998 04:09:32 +0100 (CET)
[...]
> _please_ We can do better than this. Only semaphores (not spinlocks) need
> to have the priority inheritance. [...]
nope there are _not_ only semaphores, but many other types of locks.
> [...] This can be done with lists off the
> semaphore and tasks… [...]
it’s _not_ easy [...]

Why Computer Science is a failed field #2

I mentioned the phobia against mere experimentation recently, but now I have some more fascinating glimpses into “peer review”. I have some theoretical work I’m trying to finish up and get published somewhere so someone smart can do something with it. It may be junk or not – that’s why we have “peer review” in [...]

Linux descends into priority inheritance hell

The PI chain walk is implemented by the function rt_mutex_adjust_prio_chain. The implementation has gone through several iterations, and has ended up with what we believe is the best. It walks the PI chain by only grabbing at most two locks at a time, and is very efficient. The rt_mutex_adjust_prio_chain can be used [...]

State machines and circuits

The cross coupled latch is one of the greatest inventions of the 20th century
State machine models of timing and circuit design

Public spirit of programmers

It’s sad to note that while Doctors/engineers/journalists/even-lawyers without borders are all organizations of people who help less developed nations, “programmers/software/etc” without borders refers to outsourcing.

Bias in academic reviewing

EURYI applications were first submitted to the relevant national research councils, who could nominate a specific number of candidates. This selection cut the proportion of women from one-quarter to one-fifth. Each national research council oversaw a drop in the number of selected women. In Spain, where nearly a third of the applicants were women, not [...]

Computer Science as a failed discipline

I write an email to a CS Prof. asking if they have any followup work on some nice OS measurement research they published a couple of years back. The response is that there is no followup and then:
Me: Too bad. Is it just me or has everyone given up on measurement in OS research?
Prof: It [...]

Amory Lovins on smart engineering

Data centers show up around minute 24.