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