[LSF/MM ATTEND] Improving CMA

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

On Thu, Nov 27, 2014 at 03:12:04PM +0900, Joonsoo Kim wrote:
> 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 also tried to solve problem from CMA, that is, reserved memory
> utilization.
> 
> https://lkml.org/lkml/2014/5/28/64
> 
> While playing that patchset, I found serious problem about free page
> counting, so I stopped to develop it for a while and tried to fix it.
> Now, it is fixed by me and I can continue my patchset.
> 
> https://lkml.org/lkml/2014/10/31/69
> 
> I heard that Minchan suggests new CMA zone like movable zone, and, I
> think that it would be the way to go. But, it would be a long-term goal
> and I'd like to solve utilization problem with my patchset for now.
> It is the biggest issue and it already forces someone to develop
> out of tree solution. It's not good that out of tree solution is used
> more and more in the product so I'd like to fix it quickly at first
> stage.
> 
> I think that CMA have big potential. If we fix problems of CMA
> completely, it can be used for many places. One such case in my mind
> is hugetlb or THP. Until now, hugetlb uses reserved approach, that is
> very inefficient. System administrator carefully set the number of
> reserved hugepage according to whole system workload. And application
> can't use it freely, because it is very limited and managed resource.
> If we use CMA for hugetlb, we can easily allocate hugepage and
> application can use hugepages more freely.
> 
> Anyway, I'd like to attend LSF/MM and discuss this topic.

I change the subject according to LSF/MM attend request format.
What I can do and why I'd like to attend is explained above.
Sorry for noise.

Thanks.

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