Re: [PATCH RFC] v1 expedited "big hammer" RCU grace periods

[Paul E. McKenney]

On Thu, Apr 23, 2009 at 08:47:02AM -0700, Linus Torvalds wrote:
> 
> 
> On Thu, 23 Apr 2009, Paul E. McKenney wrote:
> > 
> > Hmmm...  I need to ask Jeff Chua what HZ he was running with.  Because if
> > there was some read-side critical section soaking up 30 milliseconds,
> > all that hammering will do is slow things down...
> 
> The original bug report comes from simply bootup:
> 
>   "I'm loading all the firewall rules during boot-up and this 6 secs 
>    slowness is really not very nice to wait for."
> 
> IOW, the problematic case likely effectively has _nothing_ else going on. 
> Sure, there might be some parallelism (the bootup scripts are getting 
> better for that), but hopefully not 6 seconds worth, and not likely any 
> complex critical sections.

Sounds good to me!  ;-)

							Thanx, Paul
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