linux-kernel - Re: [PATCH] sysctl: vfs_cache

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Message-Id: <CDF579E6-342C-4B99-916A-3CE118ABD02F@mac.com>
Date:	Thu, 22 Mar 2007 20:07:56 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	"H. Peter Anvin" <hpa@...or.com>, "J.H." <warthog9@...nel.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sysctl: vfs_cache_divisor

On Mar 21, 2007, at 19:11:40, Andrew Morton wrote:
> On Wed, 21 Mar 2007 16:01:32 -0700 Randy Dunlap  
> <randy.dunlap@...cle.com> wrote:
>> I prefer the fixed-point values for pressure and dirty* to having  
>> duplicated entries for each of them.  I'll proceed with that idea.
>
> Problem is, if a read of /proc/sys/vm/dirty_ratio is changed to  
> return 7.457 then existing userspace might get confused.
>
> This might be acceptable if we are careful to ensure that reads of / 
> proc/sys/vm/dirty_ratio will always return an integer if it was  
> previously initialised with an integer.

What about instead adding support for fractions (IE: "1/1000") in / 
proc/sys/vm/dirty_ratio?  If the denominator is 100, the default,  
then it prints in the form "$NUMERATOR", otherwise it prints answers  
of the form "$NUMERATOR/$DENOMINATOR".  Input could be of either  
form, with the kernel auto-setting the denominator to 100 if none is  
specified.

Cheers,
Kyle Moffett
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