Re: [Patch 7/8] proc interface for block I/O delays

From: Andrew Morton
Date: Thu Mar 30 2006 - 00:02:19 EST


Shailabh Nagar <nagar@xxxxxxxxxxxxxx> wrote:
>
> delayacct-procfs.patch
>
> Export I/O delays seen by a task through /proc/<tgid>/stats
> for use in top etc.
>
> Note that delays for I/O done for swapping in pages (swapin I/O) is
> clubbed together with all other I/O here (this is not the
> case in the netlink interface where the swapin I/O is kept distinct)
>
> ...
>
> +
> +unsigned long long __delayacct_blkio_ticks(struct task_struct *tsk)

Why unsigned long long here, rather than __u64?

> +{
> + unsigned long long ret;
> +
> + if (!tsk->delays)
> + return 0;

delayacct_blkio_ticks() already checked that.


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