Re: [PATCH 1/4] mm, memory_hotplug: cleanup memory offline path

[Michal Hocko]

On Thu 28-03-19 14:43:17, Oscar Salvador wrote:
> From: Michal Hocko <mhocko@xxxxxxxx>
> 
> check_pages_isolated_cb currently accounts the whole pfn range as being
> offlined if test_pages_isolated suceeds on the range. This is based on
> the assumption that all pages in the range are freed which is currently
> the case in most cases but it won't be with later changes, as pages
> marked as vmemmap won't be isolated.
> 
> Move the offlined pages counting to offline_isolated_pages_cb and
> rely on __offline_isolated_pages to return the correct value.
> check_pages_isolated_cb will still do it's primary job and check the pfn
> range.
> 
> While we are at it remove check_pages_isolated and offline_isolated_pages
> and use directly walk_system_ram_range as do in online_pages.
> 
> Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
> Signed-off-by: Oscar Salvador <osalvador@xxxxxxx>

Can we merge this even without the rest of the series? It looks like a
useful thing regardless of this series. Sure we do not really use it
right now but it cleans up the code and actually removes more than it
adds...

-- 
Michal Hocko
SUSE Labs