Re: [PATCH 07/10] mm: count reclaimable pages per BDI

On Sat, 2007-04-21 at 02:55 -0700, Andrew Morton wrote:
> On Fri, 20 Apr 2007 17:52:01 +0200 Peter Zijlstra <[email protected]> wrote:
> 
> > Count per BDI reclaimable pages; nr_reclaimable = nr_dirty + nr_unstable.
> 
> hm.  Aggregating dirty and unstable at inc/dec time is a bit kludgy.  If
> later on we want to know just "dirty" then we're in trouble.
> 
> I can see the logic behind it though.
> 
> Perhaps one could have separate BDI_DIRTY and BDI_UNSTABLE and treat them
> separately at inc/dec time, but give them the same numerical value, so
> they in fact refer to the same counter.  That's kludgy too.

:-(

I struggled with it too; don't have a ready solution either. I'll do
whatever the consensus agrees upon.

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• References:
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    • From: Peter Zijlstra <[email protected]>
  • Re: [PATCH 07/10] mm: count reclaimable pages per BDI
    • From: Andrew Morton <[email protected]>

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