Messages in this thread | | | From | "Stefan Monnier" <monnier+lists/linux/kernel/news/@tequila.cs.yale.edu> | Subject | Re: [RFC] - Some notions that I would like comments on | Date | 11 Jul 1999 10:53:32 -0400 |
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>>>>> "Jeff" == Jeff Dike <jdike@karaya.com> writes: > Making idle threads earn their living > This involves finding parallelism in the kernel and getting an otherwise idle > processor to handle one of the parallel chunks of work.
Hopeless. The cost of inter-CPU communication is way too high to try to share such fine-grained tasks.
> Compressive paging > Before writing a page out to swap, compress it.
Keeps coming back every once in a while. Has already been tried in a few cases, and it has some definite advantages in a few cases. But it also has some nasty difficulties. Sadly every experiment I know of ended up stopping as soon as some code worked and showed little improvement.
> Speculative I/O
Usually called ~asynchronous I/O".
> IPC through page remapping
Slow. Only worth it if the message is big enough (last time I heard, the cut-over point was around 8KB).
> Runaway process detection
Excellent way to bloat the kernel with code that catches about 1% of the problematic cases, which happen to be the least annoying cases (your runaway processes will simply eat up some of your CPU time, but will have a very low priority, so it doesn't slow down the machine too much, is trivial to kill, ...).
Stefan
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