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List: linux-aio
Subject: Re: [PATCH 13/25] aio: Convert read_events() to hrtimers
From: Kent Overstreet <koverstreet () google ! com>
Date: 2012-11-29 1:05:16
Message-ID: 20121129010516.GB15094 () google ! com
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On Wed, Nov 28, 2012 at 04:24:36PM -0800, Zach Brown wrote:
> > - int i = 0;
> > + DEFINE_WAIT(wait);
> > + struct hrtimer_sleeper t;
> > + size_t i = 0;
>
> Changing i to size_t is kind of surprising. Is that on purpose?
I doubt it matters due to limits on ringbuffer size elsewhere but size_t
is more correct, since we're counting objects in an array.
> > - set_task_state(tsk, TASK_RUNNING);
> > - remove_wait_queue(&ctx->wait, &wait);
> > -
> > if (unlikely(ret <= 0))
> > break;
> >
> > @@ -879,11 +844,10 @@ static int read_events(struct kioctx *ctx,
> > event ++;
> > i ++;
> > }
> > -
> > - if (timeout)
> > - clear_timeout(&to);
> > out:
> > - destroy_timer_on_stack(&to.timer);
> > + hrtimer_cancel(&t.timer);
> > + destroy_hrtimer_on_stack(&t.timer);
> > + finish_wait(&ctx->wait, &wait);
>
> I'd move the finish_wait() up to where TASK_RUNNING was set previously
> so that we can't call copy_to_user() while still set to
> TASK_INTERRUPTIBLE.
Slightly less efficient, but yeah that's more correct and this code all
changes later anyways.
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