Re: [Lsf-pc] [LSF/MM TOPIC] Improving CMA

[Mel Gorman <mgorman@suse.de>]

On Mon, Nov 24, 2014 at 05:54:14PM -0800, Laura Abbott wrote:
> There have been a number of patch series posted designed to improve various
> aspects of CMA. A sampling:
> 
> https://lkml.org/lkml/2014/10/15/623
> http://marc.info/?l=linux-mm&m=141571797202006&w=2
> https://lkml.org/lkml/2014/6/26/549
> 
> As far as I can tell, these are all trying to fix real problems with CMA but
> none of them have moved forward very much from what I can tell. The goal of
> this session would be to come out with an agreement on what are the biggest
> problems with CMA and the best ways to solve them.
> 

I think this is a good topic. Some of the issues have been brought up before
at LSF/MM but they never made that much traction so it's worth revisiting. I
haven't been paying close attention to the mailing list discussions but
I've been a little worried that the page allocator paths are turning into
a bigger and bigger mess. I'm also a bit worried that options such as
migrating pages out of CMA areas that are about to be pinned for having
callback options to forcibly free pages never went anywhere.

-- 
Mel Gorman
SUSE Labs

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