linux-kernel - Re: SCSI RAM driver ported to 3.3 kernel for file system and I/O testing

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Date:	Wed, 16 May 2012 15:35:06 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	chetan loke <loke.chetan@...il.com>
Cc:	Tim Chen <tim.c.chen@...ux.intel.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-scsi@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: SCSI RAM driver ported to 3.3 kernel for file system and I/O
 testing

On Wed, May 16, 2012 at 03:31:55PM -0400, chetan loke wrote:
> > +               if (list_empty(&ram_device->commands))
> > +                       wake_up_process(ram_device->thread);
> 
> Didn't look in detail but if the queue is empty then why would you
> want to wake up the kthread? What if you just wake_up after
> list_add_tail below?

If the list is non-empty, then the kthread has already been woken up
and doesn't need to be woken again.

> > +               list_add_tail(&ram_cmnd->queue, &ram_device->commands);
> > +               spin_unlock_irqrestore(shost->host_lock, flags);
> > +       } else {
> > +               scsi_ram_execute_command(cmnd);
> > +       }
> 
> 
> Chetan Loke
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