Re: [PATCH] mm: Do not stall in synchronous compaction for THPallocations

[David Rientjes]

On Thu, 10 Nov 2011, Andrew Morton wrote:

> > This patch once again prevents sync migration for transparent
> > hugepage allocations as it is preferable to fail a THP allocation
> > than stall.
> 
> Who said?  ;) Presumably some people would prefer to get lots of
> huge pages for their 1000-hour compute job, and waiting a bit to get
> those pages is acceptable.
> 

Indeed.  It seems like the behavior would better be controlled with 
/sys/kernel/mm/transparent_hugepage/defrag which is set aside specifically 
to control defragmentation for transparent hugepages and for that 
synchronous compaction should certainly apply.
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