Re: [PATCH] memcg: Add memory.pressure_level events

From: Greg Thelen
Date: Wed Feb 13 2013 - 10:41:23 EST


On Tue, Feb 12 2013, Anton Vorontsov wrote:

> Hi Greg,
>
> Thanks for taking a look!
>
> On Tue, Feb 12, 2013 at 10:42:51PM -0800, Greg Thelen wrote:
> [...]
>> > +static bool vmpressure_event(struct vmpressure *vmpr,
>> > + unsigned long s, unsigned long r)
>> > +{
>> > + struct vmpressure_event *ev;
>> > + int level = vmpressure_calc_level(vmpressure_win, s, r);
>> > + bool signalled = 0;
>> s/bool/int/
>
> Um... I surely can do this, but why do you think it is a good idea?

Because you incremented signalled below. Incrementing a bool seems
strange. A better fix would be to leave this a bool and
s/signaled++/signaled = true/ below.

>> > +
>> > + mutex_lock(&vmpr->events_lock);
>> > +
>> > + list_for_each_entry(ev, &vmpr->events, node) {
>> > + if (level >= ev->level) {
>> > + eventfd_signal(ev->efd, 1);
>> > + signalled++;
>> > + }
>> > + }
>> > +
>> > + mutex_unlock(&vmpr->events_lock);
>> > +
>> > + return signalled;
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