Re: [patch] mm, thp: restructure thp avoidance of light synchronous migration

[David Rientjes]

On Mon, 28 Jul 2014, Vlastimil Babka wrote:

> Looks like kind of a shotgun approach to me. A single __GFP_NO_KSWAPD bullet
> is no longer enough, so we use all the flags and hope for the best. It seems
> THP has so many flags it should be unique for now, but I wonder if there is a
> better way to say how much an allocation is willing to wait.
> 

We would have to introduce a new __GFP_FAULT bit to distinguish between 
allocations at pagefault that should not use synchronous memory compaction 
solely for this case, it's probably not worth it.
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