Re: [RFC][PATCH 3/5] memcg: Disable preemption inmemcg_check_events()

[Johannes Weiner]

On Mon, Sep 19, 2011 at 05:20:43PM -0400, Steven Rostedt wrote:
> From: Steven Rostedt <srostedt@xxxxxxxxxx>
> 
> The code in memcg_check_events() calls this_cpu_read() on
> different variables without disabling preemption, and can cause
> the calculations to be done from two different CPU variables.
> 
> Disable preemption throughout the check to keep apples and oranges
> from becoming a mixed drink.

Makes sense, thanks!

Since the atomic versions are no longer required with preemption
disabled explicitely, could you also make the this_cpu ops in
__memcg_event_check and __mem_cgroup_target_update non-atomic in the
same go?
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