Re: [PATCH] mm/huge_memory: add TRANSPARENT_HUGEPAGE_NEVER for THP

[Hugh Dickins]

On Fri, 2 Dec 2022, David Rientjes wrote:
> On Thu, 1 Dec 2022, Matthew Wilcox wrote:
> > On Wed, Nov 30, 2022 at 04:51:46PM +0800, ye.xingchen@xxxxxxxxxx wrote:
> > > From: ye xingchen <ye.xingchen@xxxxxxxxxx>
> > > 
> > > Sometimes we may need the /sys/kernel/mm/transparent_hugepage/enabled to
> > > default as [never] at the first time.
> > 
> > What is going wrong with THP enabled that you need to disable it?
> > 
> 
> That would be useful to know in addition to why this needs to be part of 
> .config and not simply using the kernel command line option.

There is also the puzzle of what new feature gets added by

#ifdef CONFIG_TRANSPARENT_HUGEPAGE_NEVER
#endif

Hugh