Re: [PATCH] increment nr_tasks in io_context when CLONE_IO is set

From: Nikanth Karthikesan
Date: Tue Apr 15 2008 - 23:34:17 EST



On Tue, 2008-04-15 at 09:24 +0200, Jens Axboe wrote:
> On Tue, Apr 15 2008, Nikanth Karthikesan wrote:
> > Increment the nr_tasks associated with the io_context when CLONE_IO flag
> > is set.
> >
> > Signed-off-by: Nikanth Karthikesan <knikanth@xxxxxxx>
> >
> > --
> > diff --git a/kernel/fork.c b/kernel/fork.c
> > index dd249c3..01e843b 100644
> > --- a/kernel/fork.c
> > +++ b/kernel/fork.c
> > @@ -812,6 +812,7 @@ static int copy_io(unsigned long clone_f
> > tsk->io_context = ioc_task_link(ioc);
> > if (unlikely(!tsk->io_context))
> > return -ENOMEM;
> > + atomic_inc(&tsk->io_context->nr_tasks);
> > } else if (ioprio_valid(ioc->ioprio)) {
> > tsk->io_context = alloc_io_context(GFP_KERNEL, -1);
> > if (unlikely(!tsk->io_context))
>
> Fix is correct, however it would be more appropriate in ioc_task_link()
> instead.

Yes. Thanks.

>
> diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
> index cac4b36..2b7a118 100644
> --- a/include/linux/iocontext.h
> +++ b/include/linux/iocontext.h
> @@ -91,8 +91,10 @@ static inline struct io_context *ioc_task_link(struct io_context *ioc)
> * if ref count is zero, don't allow sharing (ioc is going away, it's
> * a race).
> */
> - if (ioc && atomic_inc_not_zero(&ioc->refcount))
> + if (ioc && atomic_inc_not_zero(&ioc->refcount)) {
> + atomic_inc(&ioc->nr_tasks);
> return ioc;
> + }
>
> return NULL;
> }
>

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