Print a (rate-limited) warning when UMA zone is full.

[Pawel Jakub Dawidek]

On Thu, Nov 29, 2012 at 10:56:32AM +0000, Robert N. M. Watson wrote:
> On 29 Nov 2012, at 10:53, Pawel Jakub Dawidek wrote:
> > Agreed, especially if reaching those limits is expected by the
> > administrator and he is not going to increase them. But in this case it
> > would be even better to provide a way to turn them off.
> 
> I wonder if each instance of a 'ratecheck' should come with an associated tunable/sysctl pair to allow suppression to be easily configured. I almost find myself wondering if we want something that looks a bit like our static SYSCTL/VFS_SET/etc declarations:
> 
> 	static RATECHECK(..., "foo.bar.baz", ...);
> 
> Unfortunately, the tunable/sysctl mismatch makes it slightly awkward since you'd need to declare both, but I think probably worthwhile.

I'm afraid you lost me here. Tunable/sysctl name is not related in any
way with the warning we are printing. How can you tell
kern.ipc.maxsockets affects limits of eight different UMA zones?
Also rate-limiting is not only used to print warnings, current
ppsratecheck() function just answer the question if the limit should be
enforced (something is happening too frequently) or not.

-- 
Pawel Jakub Dawidek                       http://www.wheelsystems.com
FreeBSD committer                         http://www.FreeBSD.org
Am I Evil? Yes, I Am!                     http://tupytaj.pl
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