Re: [PATCH] mm: introduce MADV_CLR_HUGEPAGE

On May 31, 2017 3:05:56 PM GMT+03:00, Michal Hocko [off-list ref] wrote:

On Wed 31-05-17 12:08:45, Mike Rapoport wrote:

quoted

On Tue, May 30, 2017 at 12:39:30PM +0200, Michal Hocko wrote:

[...]

quoted

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Also do you expect somebody else would use new madvise? What would

be the

quoted

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usecase?

I can think of an application that wants to keep 4K pages to save

physical

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memory for certain phase, e.g. until these pages are populated with

very

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few data. After the memory usage increases, the application may wish

to

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stop preventing khugepged from merging these pages, but it does not

have

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strong inclination to force use of huge pages.

Well, is actually anybody going to do that?

Well, I don't​ know, it's pretty much future telling :)
For sure, without the new madvise nobody will be even able to do that.

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