linux-kernel - Re: [PATCH] relay: use plain timer instead of delayed work

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Message-Id: <1178508691.4534.4.camel@ubuntu>
Date:	Sun, 06 May 2007 22:31:31 -0500
From:	Tom Zanussi <zanussi@...cast.net>
To:	Satyam Sharma <satyam.sharma@...il.com>
Cc:	akpm@...ux-foundation.org, oleg@...sign.ru,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] relay: use plain timer instead of delayed work

On Sun, 2007-05-06 at 15:40 +0530, Satyam Sharma wrote:
> Hi Tom,
> 
> On 5/6/07, Tom Zanussi <zanussi@...cast.net> wrote:
> > [...]
> > relay doesn't need to use schedule_delayed_work() for waking readers
> > when a simple timer will do.
> >
> > Signed-off-by: Tom Zanussi <zanussi@...cast.net>
> > [...]
> > diff --git a/include/linux/relay.h b/include/linux/relay.h
> > index 759a0f9..cac0732 100644
> > --- a/include/linux/relay.h
> > +++ b/include/linux/relay.h
> > @@ -38,7 +38,7 @@ struct rchan_buf
> >         size_t subbufs_consumed;        /* count of sub-buffers consumed */
> >         struct rchan *chan;             /* associated channel */
> >         wait_queue_head_t read_wait;    /* reader wait queue */
> > -       struct delayed_work wake_readers; /* reader wake-up work struct */
> > +       struct timer_list timer;        /* reader wake-up timer */
> >         struct dentry *dentry;          /* channel file dentry */
> >         struct kref kref;               /* channel buffer refcount */
> >         struct page **page_array;       /* array of current buffer pages */
> 
> I suspect you could now safely get rid of the "#include
> <linux/wait.h>" at the top of relay.h too. And although timer.h comes
> via #include <linux/sched.h>, you might want to do that explicitly
> too.
> 

Hi Satyam,

Thanks for your comments - I've updated the patch to include timer.h but
wait.h would still be needed for wait_queue_head_t, so will leave that
in.

Tom



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