Re: [RFC 2/5] sched: Add CPU rate soft caps

[Mike Galbraith]

On Fri, 2006-05-26 at 20:48 +1000, Con Kolivas wrote:
> On Friday 26 May 2006 14:20, Peter Williams wrote:
> > 3. Enforcement of caps is not as strict as it could be in order to
> > reduce the possibility of a task being starved of CPU while holding
> > an important system resource with resultant overall performance
> > degradation.  In effect, all runnable capped tasks will get some amount
> > of CPU access every active/expired swap cycle.  This will be most
> > apparent for small or zero soft caps.
> 
> The array swap happens very frequently if there are nothing but heavily cpu 
> bound tasks, which is not an infrequent workload. I doubt the zero caps are 
> very effective in that environment.

Hmm.  I think that came out kinda back-assward.  You meant "the array
swap happens very frequently _unless_..."  No?

But anyway, I can't think of any reason to hold back an uncontested
resource.

	-Mike

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