linux-kernel - Re: [PATCH] mm/memory_hotplug: Drop memory device reference after find_memory

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Message-ID: <701f0748-c99e-7e68-caf1-6b701f8d3bff@redhat.com>
Date:   Wed, 10 Apr 2019 14:48:46 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Wei Yang <richard.weiyang@...il.com>, Qian Cai <cai@....pw>,
        Arun KS <arunks@...eaurora.org>,
        Mathieu Malaterre <malat@...ian.org>
Subject: Re: [PATCH] mm/memory_hotplug: Drop memory device reference after
 find_memory_block()

On 10.04.19 14:28, Oscar Salvador wrote:
> On Wed, Apr 10, 2019 at 12:14:55PM +0200, David Hildenbrand wrote:
>> While current node handling is probably terribly broken for memory block
>> devices that span several nodes (only possible when added during boot,
>> and something like that should be blocked completely), properly put the
>> device reference we obtained via find_memory_block() to get the nid.
> 
> We even have nodes sharing sections, so tricky to "fix".
> But I agree that the way memblocks are being handled now sucks big time.
> 

I'm planning to eventually tackle this via memblocks directly, using
"nid" to indicate if mixed sections are contained. So we don't have to
scan all the pages ...

-- 

Thanks,

David / dhildenb