Re: [PATCH v7 1/4] spinlock: A new lockref structure for locklessupdate of refcount

[Pavel Machek]

Hi!

> It is entirely possible that it is just a "cycles:pp" oddity - because
> the "lock xadd" is serializing, it can't retire until everything
> around it has been sorted out, and maybe it just shows up in profiles
> more than is really "fair" to the instruction itself, because it ends
> up being that stable point for potentially hundreds of instructions
> around it.

Hmm, turn "lock xadd" into plain add, and see if it improves loops per
second? Preferably on scratch filesystem, because you may corrupt it...
									Pavel
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