Re: [Patch 2/8] Block I/O, swapin delays

[Andrew Morton]

Shailabh Nagar <nagar@xxxxxxxxxxxxxx> wrote:
>
> delayacct-blkio-swapin.patch
> 
> Collect per-task block I/O delay statistics.
> 
> Unlike earlier iterations of the delay accounting
> patches, now delays are only collected for the actual
> I/O waits rather than try and cover the delays seen in
> I/O submission paths.
> 
> Account separately for block I/O delays
> incurred as a result of swapin page faults whose
> frequency can be affected by the task/process' rss limit.
> Hence swapin delays can act as feedback for rss limit changes
> independent of I/O priority changes.
> 
> ..
>
> +#define PF_SWAPIN	0x02000000	/* I am doing a swap in */
> 

Is there really no sane alternative to doing it this way?
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