linux-kernel - Re: [RFC PATCH] mm, hotplug: get rid of auto_online

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Date:   Mon, 27 Feb 2017 11:28:52 -0600
From:   Reza Arbab <arbab@...ux.vnet.ibm.com>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Daniel Kiper <daniel.kiper@...cle.com>,
        linux-api@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-s390@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-acpi@...r.kernel.org, Michal Hocko <mhocko@...e.com>
Subject: Re: [RFC PATCH] mm, hotplug: get rid of auto_online_blocks

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.

-- 
Reza Arbab