Re: [PATCH] mm: remove lru_add_drain_all in alloc_contig_range

[Oscar Salvador]

On Wed, Feb 10, 2021 at 01:17:33PM +0100, Vlastimil Babka wrote:
> AFAICS, at the time page migration used putback_lru_page() to release the
> migration source page. This would put the page on lru pvec even if it was in
> fact not mapped anywhere anymore, and only the drain would actually free it.
> Seems Minchan optimized this in 2016 by c6c919eb90e0 ("mm: use put_page() to
> free page instead of putback_lru_page()")

Ok, I see. Thanks for this valuable information Vlastimil.

-- 
Oscar Salvador
SUSE L3