> > > +/*
> > > + * For batching....mem_cgroup_charge_statistics()(see below).
> > > + */
> > > +static inline void mem_cgroup_stat_add(struct mem_cgroup_stat *stat,
> > > +                enum mem_cgroup_stat_index idx, int val)
> > > +{
> > > +	int cpu = smp_processor_id();
> > > +	stat->cpustat[cpu].count[idx] += val;
> > > +}
> > 
> > i think the function name should be something which implies batching.
> > 
> Hm, How about this ?
> ==
> mem_cgroup_stat_add_atomic() 
> ==
> and add this 
> ==
> VM_BUG_ON(preempt_count() == 0)
> ==

_atomic sounds like a different thing to me.  _nonpreemptible?

YAMAMOTO Takashi
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