On Wed 21-09-16 11:27:48, Dave Hansen wrote:

On 09/21/2016 11:20 AM, Michal Hocko wrote:

quoted

I would even question the per page block offlining itself. Why would
anybody want to offline few blocks rather than the whole node? What is
the usecase here?

The original reason was so that you could remove a DIMM or a riser card
full of DIMMs, which are certainly a subset of a node.

OK, I see, thanks for the clarification! I was always thinking more in
node rather than physical memory range hot-remove. I do agree that it
makes sense to free the whole gigantic huge page if we encounter a tail
page for the above use case because losing the gigantic page is
justified when the whole dim goes away.

Thanks!

-- 
Michal Hocko
SUSE Labs

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>