Re: [Xen-devel] [RFC PATCH] mm, hotplug: get rid of auto_online_blocks

[Michal Hocko <mhocko@xxxxxxxxxx>]

On Mon 27-02-17 11:28:52, Reza Arbab wrote:
> On Mon, Feb 27, 2017 at 10:28:17AM +0100, Michal Hocko wrote:
> >diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> >index 134a2f69c21a..a72f7f64ee26 100644
> >--- a/include/linux/memory_hotplug.h
> >+++ b/include/linux/memory_hotplug.h
> >@@ -100,8 +100,6 @@ extern void __online_page_free(struct page *page);
> >
> >extern int try_online_node(int nid);
> >
> >-extern bool memhp_auto_online;
> >-
> >#ifdef CONFIG_MEMORY_HOTREMOVE
> >extern bool is_pageblock_removable_nolock(struct page *page);
> >extern int arch_remove_memory(u64 start, u64 size);
> >@@ -272,7 +270,7 @@ static inline void remove_memory(int nid, u64 start, u64 
> >size) {}
> >
> >extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
> >             void *arg, int (*func)(struct memory_block *, void *));
> >-extern int add_memory(int nid, u64 start, u64 size);
> >+extern int add_memory(int nid, u64 start, u64 size, bool online);
> >extern int add_memory_resource(int nid, struct resource *resource, bool 
> >online);
> >extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
> >             bool for_device);
> 
> It would be nice if instead of a 'bool online' argument, add_memory() and
> add_memory_resource() took an 'int online_type', ala online_pages().
> 
> That way we could specify offline, online, online+movable, etc.

Sure that would require more changes though and as such it is out of
scope of this patch. But you are right, this is a logical follow up
step.
-- 
Michal Hocko
SUSE Labs

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