Re: [Patch 2/8] Sync block I/O and swapin delay collection

[Balbir Singh <balbir@in.ibm.com>]

On Mon, May 08, 2006 at 02:19:52PM -0700, Andrew Morton wrote:
> Balbir Singh <balbir@in.ibm.com> wrote:
> >
> > @@ -550,6 +550,12 @@ struct task_delay_info {
> >  	 * Atomicity of updates to XXX_delay, XXX_count protected by
> >  	 * single lock above (split into XXX_lock if contention is an issue).
> >  	 */
> > +
> > +	struct timespec blkio_start, blkio_end;	/* Shared by blkio, swapin */
> > +	u64 blkio_delay;	/* wait for sync block io completion */
> > +	u64 swapin_delay;	/* wait for swapin block io completion */
> > +	u32 blkio_count;
> > +	u32 swapin_count;
> 
> These fields are a bit mystifying.
> 
> In what units are blkio_delay and swapin_delay?
> 
> What is the meaning behind blkio_count and swapin_count?
> 
> Better comments needed, please.

Will add more detailed comments and send them as updates.


	Thanks,
	Balbir Singh,
	Linux Technology Center,
	IBM Software Labs