svn commit: r334819 - head/sys/vm
Gleb Smirnoff
glebius at FreeBSD.org
Sat Jun 9 00:26:17 UTC 2018
On Fri, Jun 08, 2018 at 03:07:07PM +1000, Kubilay Kocak wrote:
K> > UMA memory debugging enabled with INVARIANTS consists of two things:
K> > trashing freed memory and checking that allocated memory is properly
K> > trashed, and also of keeping a bitset of freed items. Trashing/checking
K> > creates a lot of CPU cache poisoning, while keeping debugging bitsets
K> > consistent creates a lot of contention on UMA zone lock(s). The performance
K> > difference between INVARIANTS kernel and normal one is mostly attributed
K> > to UMA debugging, rather than to all KASSERT checks in the kernel.
K> >
K> > Add loader tunable vm.debug.divisor that allows either to turn off UMA
K>
K> Is 'sample interval' a standard/common enough term for this kind of
K> mechanism to name the sysctl with it rather than the implementation?
K>
K> Or 'sample frequency'
Interval definitely doesn't fit here. Frequency is closer, but still not the
right term, IMHO. Native speaker required here to judge. I am okay if anyone
who is confident changes wording here.
--
Gleb Smirnoff
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