Re: [PATCH -mmotm 1/5] memcg: disable irq at page cgroup lock

[Peter Zijlstra]

On Fri, 2010-04-23 at 13:17 -0700, Greg Thelen wrote:
> +static void mem_cgroup_begin_page_cgroup_reassignment(void)
> +{
> +       VM_BUG_ON(mem_cgroup_account_move_ongoing);
> +       mem_cgroup_account_move_ongoing = true;
> +       synchronize_rcu();
> +} 

btw, you know synchronize_rcu() is _really_ slow?

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