Re: [PATCH] sysctl: vfs_cache_divisor

[Kyle Moffett]

On Mar 21, 2007, at 19:11:40, Andrew Morton wrote:
> On Wed, 21 Mar 2007 16:01:32 -0700 Randy Dunlap  
> <randy.dunlap@xxxxxxxxxx> 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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