linux-kernel - Re: [PATCH] mm: swap prefetch more improvements

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Message-Id: <20070514150032.d3ef6bb1.akpm@linux-foundation.org>
Date:	Mon, 14 May 2007 15:00:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Con Kolivas <kernel@...ivas.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	ck@....kolivas.org
Subject: Re: [PATCH] mm: swap prefetch more improvements

On Mon, 14 May 2007 10:50:54 +1000
Con Kolivas <kernel@...ivas.org> wrote:

> akpm, please queue on top of "mm: swap prefetch improvements"
> 
> ---
> Failed radix_tree_insert wasn't being handled leaving stale kmem.
> 
> The list should be iterated over in the reverse order when prefetching.
> 
> Make the yield within kprefetchd stronger through the use of cond_resched.

hm.

> 
> -		might_sleep();
> -		if (!prefetch_suitable())
> +		/* Yield to anything else running */
> +		if (cond_resched() || !prefetch_suitable())
>  			goto out_unlocked;

So if cond_resched() happened to schedule away, we terminate this
swap-tricking attempt.  It's not possible to determine the reasons for this
from the code or from the changelog (==bad).

How come?

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