Messages in this thread | | | Date | Mon, 6 Dec 2004 08:13:39 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] Time sliced CFQ #2 |
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On Sun, Dec 05 2004, Jeff Sipek wrote: > On Sun, Dec 05, 2004 at 07:58:45PM +0100, Jens Axboe wrote: > > It should be really easy to try some rudimentary prio io support - just > > scale the time slice based on process priority. A few lines of code > > change, and io priority now follows process cpu scheduler priority. To > > work really well, the code probably needs a few more limits besides just > > slice time. > > I started working on the rudimentary io prio code, and it got me > thinking... Why use the cpu scheduler priorities? Wouldn't it make > more sense to add io_prio to task_struct? This way you can have a > process which you know needs a lot of CPU but not as much io, or the > other way around. > > What do you think?
I don't like tieing them together, see various threads in the list archives for discussions about that. I just said that it would be easy to test basic support this way, since you only have to change a few lines.
I've already posted the glue code to set/query process priorities, I would plan on just using something like that again.
-- Jens Axboe
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