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