Re: REGRESSION: Performance regressions from switching anon_vma->lockto mutex

[Andi Kleen]

(needing to know the
> number of cpus to optimize locking sounds like a trainwreck all of its
> own, needing it _that_ often instead of just once at startup is even
> worse).

libdb does it only once per startup, it's just that it gets restarted 
for every
child (it's a library, not a server)

Really the kernel just needs to provide a faster way to get that.
Requiring /proc/stat for that is just insane.

I'll resend the sysconf patchkit I guess :-)

-Andi


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