linux-kernel - Re: [PATCH] MAX_PAUSE to be at least 4

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Message-Id: <20130122160436.f0fa8352.akpm@linux-foundation.org>
Date:	Tue, 22 Jan 2013 16:04:36 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	paul.szabo@...ney.edu.au
Cc:	linux-mm@...ck.org, 695182@...s.debian.org,
	linux-kernel@...r.kernel.org, Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH] MAX_PAUSE to be at least 4

On Mon, 21 Jan 2013 14:07:34 +1100
paul.szabo@...ney.edu.au wrote:

> Ensure MAX_PAUSE is 4 or larger, so limits in
> 	return clamp_val(t, 4, MAX_PAUSE);
> (the only use of it) are not back-to-front.

MAX_PAUSE is not used in this fashion in current kernels.

> (This patch does not solve the PAE OOM issue.)
> 
> Paul Szabo   psz@...hs.usyd.edu.au   http://www.maths.usyd.edu.au/u/psz/
> School of Mathematics and Statistics   University of Sydney    Australia
> 
> Reported-by: Paul Szabo <psz@...hs.usyd.edu.au>
> Reference: http://bugs.debian.org/695182
> Signed-off-by: Paul Szabo <psz@...hs.usyd.edu.au>
> 
> --- mm/page-writeback.c.old	2012-12-06 22:20:40.000000000 +1100
> +++ mm/page-writeback.c	2013-01-21 13:57:05.000000000 +1100
> @@ -39,7 +39,7 @@
>  /*
>   * Sleep at most 200ms at a time in balance_dirty_pages().
>   */
> -#define MAX_PAUSE		max(HZ/5, 1)
> +#define MAX_PAUSE		max(HZ/5, 4)
>  
>  /*
>   * Estimate write bandwidth at 200ms intervals.

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