Re: [patch 0/7] cpuset writeback throttling

[David Rientjes]

On Wed, 5 Nov 2008, Andrew Morton wrote:

> See, here's my problem: we have a pile of new code which fixes some
> problem.  But the problem seems to be fairly small - it only affects a
> small number of sophisticated users and they already have workarounds
> in place.
> 

The workarounds, while restrictive of how you configure your cpusets, are 
indeed effective.

> So the world wouldn't end if we just didn't merge it.  Those users
> stick with their workarounds and the kernel remains simpler and
> smaller.
> 

Agreed.  This patchset is admittedly from a different time when cpusets 
was the only relevant extension that needed to be done.

> How do we work out which is the best choice here?  I don't have enough
> information to do this.
> 

If we are to support memcg-specific dirty ratios, that requires the 
aforementioned statistics to be collected so that the calculation is even 
possible.  The series at 

	http://marc.info/?l=linux-kernel&m=122123225006571
	http://marc.info/?l=linux-kernel&m=122123241106902

is a step in that direction, although I'd prefer to see NR_UNSTABLE_NFS to 
be extracted separately from MEM_CGROUP_STAT_FILE_DIRTY so 
throttle_vm_writeout() can also use the new statistics.
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