Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2

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From: Ingo Molnar
Date: Tuesday, March 13, 2007 - 1:09 am

* Linus Torvalds <torvalds@linux-foundation.org> wrote:


i think Mike's testcase was even simpler than that: two plain CPU hogs 
on nice +5 stole much more CPU time with Con's new interactivity code 
than they did with the current interactivity code. I'd agree with Mike 
that a phenomenon like that needs to be fixed.

/less/ interactivity we can do easily in the current scheduler: just 
remove various bits here and there. The RSDL promise is that it gives us 
/more/ interactivity (with 'interactivity designed in', etc.), which in 
Mike's testcase does not seem to be the case.


yeah. It's a hard case because X is not always a _clear_ interactive 
task - still the current interactivity code handles it quite well.

but Mike's scenario wasnt even that complex. It wasnt even a hard case 
of X being starved by _other_ interactive tasks running on the same nice 
level. Mike's test-scenario was about two plain nice +5 CPU hogs 
starving nice +0 interactive tasks more than the current scheduler does, 
and this is really not an area where we want to see any regression. Con, 
could you work on this area a bit more?

	Ingo
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Messages in current thread:
Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2, Radoslaw Szkodzinski, (Sun Mar 11, 11:58 pm)
Re: [ck] Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2 ..., Rodney Gordon II, (Mon Mar 12, 11:08 pm)
Re: [ck] Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for ..., Mike Galbraith, (Mon Mar 12, 11:30 pm)
Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2, Ingo Molnar, (Tue Mar 13, 1:09 am)
Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2, Valdis.Kletnieks, (Tue Mar 13, 10:21 am)
Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2, Jeremy Fitzhardinge, (Tue Mar 13, 10:59 am)
Re: [PATCH][RSDL-mm 0/7] RSDL cpu scheduler for 2.6.21-rc3-mm2, Jeremy Fitzhardinge, (Tue Mar 13, 1:10 pm)