Re: [PATCH] mm/memcg: add unlikely to mercg->move_charge_at_immigrate

[Glauber Costa]

On 06/18/2012 05:10 PM, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@xxxxxxxxxxxxxxxxxx>
>
> move_charge_at_immigrate feature is disabled by default. Charges
> are moved only when you move mm->owner and it also add additional
> overhead.

How big is this overhead?

That's hardly a fast path. And if it happens to matter, it will be just 
bigger when you enable it, and the compiler start giving the wrong hints 
to the code.
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