Date: Wed, 29 Mar 2006 21:03:40 -0800
From: Andrew Morton <akpm@osdl.org>
To: Shailabh Nagar <nagar@watson.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Patch 2/8] Block I/O, swapin delays
Message-Id: <20060329210340.570d63e5.akpm@osdl.org>
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Shailabh Nagar <nagar@watson.ibm.com> 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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