[Bug 197923] [patch] [sched] Fix comment in sched_balance_pair and move load check ahead of lock

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197923

--- Comment #11 from Harrison Grundy <harrison.grundy at astrodoggroup.com> ---
(In reply to Mark Johnston from comment #10)

Right, but it seems like locking the tdq to "force" them into alignment would
have a bigger impact on performance than occassionally mis-balancing. If we
take the lock, and push a new thread onto the target, or pull one from the
source, when they're waiting on the lock somewhere else, the end result would
still be incorrect, wouldn't it?

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