linux-kernel - Re: [patch 0/7] cpuset writeback throttling

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Message-ID: <alpine.DEB.2.00.0811051347240.21365@chino.kir.corp.google.com>
Date:	Wed, 5 Nov 2008 14:04:42 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Lameter <cl@...ux-foundation.org>, peterz@...radead.org,
	npiggin@...e.de, Paul Menage <menage@...gle.com>, dfults@....com,
	linux-kernel@...r.kernel.org, containers@...ts.osdl.org,
	Andrea Righi <righi.andrea@...il.com>
Subject: Re: [patch 0/7] cpuset writeback throttling

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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