From: Reza Arbab <arbab@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
Andrea Arcangeli <aarcange@redhat.com>,
Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
Tang Chen <tangchen@cn.fujitsu.com>,
qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>,
slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>,
Andi Kleen <ak@linux.intel.com>,
Zhang Zhen <zhenzhang.zhang@huawei.com>,
David Rientjes <rientjes@google.com>,
Daniel Kiper <daniel.kiper@oracle.com>,
Igor Mammedov <imammedo@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Chris Metcalf <cmetcalf@mellanox.com>,
Dan Williams <dan.j.williams@gmail.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>
Subject: Re: [PATCH 0/6] mm: make movable onlining suck less
Date: Mon, 3 Apr 2017 15:42:13 -0500 [thread overview]
Message-ID: <20170403204213.rs7k2cvsnconel2z@arbab-laptop> (raw)
In-Reply-To: <20170403202337.GA12482@dhcp22.suse.cz>
On Mon, Apr 03, 2017 at 10:23:38PM +0200, Michal Hocko wrote:
>On Mon 03-04-17 14:58:30, Reza Arbab wrote:
>> However, I am seeing a regression. When adding memory to a memoryless
>> node, it shows up in node 0 instead. I'm digging to see if I can help
>> narrow down where things go wrong.
>
>OK, I guess I know what is going on here. online_pages relies on
>pfn_to_nid(pfn) to return a proper node. But we are doing
>page_to_nid(pfn_to_page(__pfn_to_nid_pfn)) so we rely on the page being
>properly initialized. Damn, I should have noticed that. There are two
>ways around that. Either the __add_section stores the nid into the
>struct page and make page_to_nid reliable or store it somewhere else
>(ideally into the memblock). The first is easier (let's do it for now)
>but longterm we do not want to rely on the struct page at all I believe.
>
>Does the following help?
>---
>diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
>index b9dc1c4e26c3..0e21b9f67c9d 100644
>--- a/mm/memory_hotplug.c
>+++ b/mm/memory_hotplug.c
>@@ -309,14 +309,19 @@ static int __meminit __add_section(int nid, unsigned long phys_start_pfn)
>
> /*
> * Make all the pages reserved so that nobody will stumble over half
>- * initialized state.
>+ * initialized state.
>+ * FIXME: We also have to associate it with a node because pfn_to_node
>+ * relies on having page with the proper node.
> */
> for (i = 0; i < PAGES_PER_SECTION; i++) {
> unsigned long pfn = phys_start_pfn + i;
>+ struct page *page;
> if (!pfn_valid(pfn))
> continue;
>
>- SetPageReserved(pfn_to_page(phys_start_pfn + i));
>+ page = pfn_to_page(pfn);
>+ set_page_node(page, nid);
>+ SetPageReserved(page);
> }
>
> return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
Almost there. I'm seeing the memory in the correct node now, but the
/sys/devices/system/node/nodeX/memoryY links are not being created.
I think it's tripping up here, in register_mem_sect_under_node():
page_nid = get_nid_for_pfn(pfn);
if (page_nid < 0)
continue;
--
Reza Arbab
next prev parent reply other threads:[~2017-04-03 20:42 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-30 11:54 [PATCH 0/6] mm: make movable onlining suck less Michal Hocko
2017-03-30 11:54 ` [PATCH 1/6] mm: get rid of zone_is_initialized Michal Hocko
2017-03-31 3:39 ` Hillf Danton
2017-03-31 6:43 ` Michal Hocko
2017-03-31 6:48 ` Michal Hocko
2017-03-31 7:39 ` [PATCH v1 " Michal Hocko
2017-04-05 8:14 ` Michal Hocko
2017-04-05 9:06 ` Igor Mammedov
2017-04-05 9:23 ` Michal Hocko
2017-03-30 11:54 ` [PATCH 2/6] mm, tile: drop arch_{add,remove}_memory Michal Hocko
2017-03-30 15:41 ` Chris Metcalf
2017-03-30 11:54 ` [PATCH 3/6] mm: remove return value from init_currently_empty_zone Michal Hocko
2017-03-31 3:49 ` Hillf Danton
2017-03-31 6:49 ` Michal Hocko
2017-03-31 7:06 ` Hillf Danton
2017-03-31 7:18 ` Michal Hocko
2017-03-31 7:43 ` Michal Hocko
2017-04-03 21:22 ` Reza Arbab
2017-04-04 7:30 ` Michal Hocko
2017-03-30 11:54 ` [PATCH 4/6] mm, memory_hotplug: use node instead of zone in can_online_high_movable Michal Hocko
2017-03-30 11:54 ` [PATCH 5/6] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko
2017-03-31 6:18 ` Hillf Danton
2017-03-31 6:50 ` Michal Hocko
2017-04-04 12:21 ` Tobias Regnery
2017-04-04 12:45 ` Michal Hocko
2017-04-06 8:14 ` Michal Hocko
2017-04-06 12:46 ` Michal Hocko
2017-03-30 11:54 ` [PATCH 6/6] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko
2017-03-31 7:46 ` Michal Hocko
2017-03-31 19:19 ` [PATCH 0/6] mm: make movable onlining suck less Heiko Carstens
2017-04-03 7:34 ` Michal Hocko
2017-04-03 11:55 ` Michal Hocko
2017-04-03 12:20 ` Igor Mammedov
2017-04-03 19:58 ` Reza Arbab
2017-04-03 20:23 ` Michal Hocko
2017-04-03 20:42 ` Reza Arbab [this message]
2017-04-04 7:23 ` Michal Hocko
2017-04-04 7:34 ` Michal Hocko
2017-04-04 8:23 ` Michal Hocko
2017-04-04 15:59 ` Reza Arbab
2017-04-04 16:02 ` Reza Arbab
2017-04-04 16:44 ` Michal Hocko
2017-04-04 18:30 ` Reza Arbab
2017-04-04 19:41 ` Michal Hocko
2017-04-04 21:43 ` Reza Arbab
2017-04-05 6:42 ` Michal Hocko
2017-04-05 9:24 ` Michal Hocko
2017-04-05 14:53 ` Reza Arbab
2017-04-05 15:42 ` Michal Hocko
2017-04-05 17:32 ` Reza Arbab
2017-04-05 18:15 ` Michal Hocko
2017-04-05 19:39 ` Michal Hocko
2017-04-05 21:02 ` Michal Hocko
2017-04-06 11:07 ` Michal Hocko
2017-04-05 15:48 ` Reza Arbab
2017-04-05 16:34 ` Michal Hocko
2017-04-05 20:55 ` Reza Arbab
2017-04-06 9:25 ` Michal Hocko
2017-04-05 13:52 ` Michal Hocko
2017-04-05 15:23 ` Reza Arbab
2017-04-05 6:36 ` Michal Hocko
2017-04-06 13:08 ` Michal Hocko
2017-04-06 15:24 ` Reza Arbab
2017-04-06 15:41 ` Michal Hocko
2017-04-06 15:46 ` Reza Arbab
2017-04-06 16:21 ` Michal Hocko
2017-04-06 16:24 ` Mel Gorman
2017-04-06 16:55 ` Mel Gorman
2017-04-06 17:12 ` Michal Hocko
2017-04-06 17:46 ` Mel Gorman
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