Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

[Martin J. Bligh]

>> But pages_min is based on the zone size, not the system size. And we
>> still cap it. Maybe that's just a mistake?
> 
> The per-zone watermarking is actually the "modern" and "working" approach. 
> 
> We didn't always do it that way. I would not be at all surprised if the 
> capping was from the global watermarking days.
> 
> Of course, I would _also_ not be at all surprised if it wasn't just out of 
> habit. Most of the things where we try to scale things up by memory size, 
> we cap for various reasons. Ie we tend to try to scale things like hash 
> sizes for core data structures by memory size, but then we tend to cap 
> them to "sane" versions.
> 
> So quite frankly, it's entirely possible that the capping is there not 
> because it _ever_ was a good idea, but just because it's what we almost 
> always do ;)
> 
> Mental inertia is definitely alive and well.

Ha ;-) Well thanks for the explanation. I would suggest the patch I sent
you makes some semblence of sense then ...

M.

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