Re: [patch] mm: introduce a common interface for balloon pages mobility fix

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On Fri, 16 Nov 2012, Rafael Aquini wrote:

> > > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git since-3.6
> > > head:   12dfb061e5fd15be23451418da01281625c0eeae
> > > commit: 86929cfa5f751de3d8be5a846535282730865d8a [365/437] mm: introduce a common interface for balloon pages mobility
> > > config: make ARCH=sh allyesconfig
> > > 
> > > All warnings:
> > > 
> > > warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> > > warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> > > --
> > > warning: (BALLOON_COMPACTION && TRANSPARENT_HUGEPAGE) selects COMPACTION which has unmet direct dependencies (MMU)
> > > 
> > 
> > mm: introduce a common interface for balloon pages mobility fix
> > 
> > CONFIG_BALLOON_COMPACTION shouldn't be selecting options that may not be 
> > supported, so make it depend on memory compaction rather than selecting 
> > it.  CONFIG_COMPACTION is enabled by default for all configs that support 
> > it.
> >     
> 
> This is already addressed at v12 revision which is on mmtom queue already.
> 

Ah, it was merged yesterday but it depends on TRANSPARENT_HUGEPAGE rather 
than COMPACTION.  Why?  Surely thp is not the only thing that benefits 
from keeping memory defragmented for high-order allocs.

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