From: Pingfan Liu <kernelfans@gmail.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: mhocko@kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: Re: [PATCH] mm/alloc: fallback to first node if the wanted node offline
Date: Thu, 6 Dec 2018 11:07:33 +0800 [thread overview]
Message-ID: <CAFgQCTv5-jeqwRVkJuDHvv0vq6uCzfdV2ZmVAU3eUzn2w2ReEQ@mail.gmail.com> (raw)
In-Reply-To: <186b1804-3b1e-340e-f73b-f3c7e69649f5@suse.cz>
On Wed, Dec 5, 2018 at 5:40 PM Vlastimil Babka <vbabka@suse.cz> wrote:
>
> On 12/5/18 10:29 AM, Pingfan Liu wrote:
> >> [ 0.007418] Early memory node ranges
> >> [ 0.007419] node 1: [mem 0x0000000000001000-0x000000000008efff]
> >> [ 0.007420] node 1: [mem 0x0000000000090000-0x000000000009ffff]
> >> [ 0.007422] node 1: [mem 0x0000000000100000-0x000000005c3d6fff]
> >> [ 0.007422] node 1: [mem 0x00000000643df000-0x0000000068ff7fff]
> >> [ 0.007423] node 1: [mem 0x000000006c528000-0x000000006fffffff]
> >> [ 0.007424] node 1: [mem 0x0000000100000000-0x000000047fffffff]
> >> [ 0.007425] node 5: [mem 0x0000000480000000-0x000000087effffff]
> >>
> >> There is clearly no node2. Where did the driver get the node2 from?
>
> I don't understand these tables too much, but it seems the other nodes
> exist without them:
>
> [ 0.007393] SRAT: PXM 2 -> APIC 0x20 -> Node 2
>
> Maybe the nodes are hotplugable or something?
>
I also not sure about it, and just have a hurry look at acpi spec. I
will reply it on another email, and Cced some acpi guys about it
> > Since using nr_cpus=4 , the node2 is not be instanced by x86 initalizing code.
>
> Indeed, nr_cpus seems to restrict what nodes we allocate and populate
> zonelists for.
Yes, in init_cpu_to_node(), since nr_cpus limits the possible cpu,
which affects the loop for_each_possible_cpu(cpu) and skip the node2
in this case.
Thanks,
Pingfan
next prev parent reply other threads:[~2018-12-06 3:07 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-04 3:05 [PATCH] mm/alloc: fallback to first node if the wanted node offline Pingfan Liu
2018-12-04 3:53 ` David Rientjes
2018-12-04 7:16 ` Pingfan Liu
2018-12-05 5:49 ` Pingfan Liu
2018-12-05 19:00 ` David Rientjes
2018-12-04 6:54 ` Wei Yang
2018-12-04 7:20 ` Pingfan Liu
2018-12-04 8:34 ` Wei Yang
2018-12-04 8:52 ` Pingfan Liu
2018-12-04 9:09 ` Wei Yang
2018-12-05 5:50 ` Pingfan Liu
2018-12-04 7:22 ` Michal Hocko
2018-12-04 8:20 ` Pingfan Liu
2018-12-04 8:40 ` Wei Yang
2018-12-04 8:56 ` Pingfan Liu
2018-12-04 8:56 ` Michal Hocko
2018-12-04 14:42 ` Vlastimil Babka
2018-12-05 5:38 ` Pingfan Liu
2018-12-05 9:21 ` Michal Hocko
2018-12-05 9:29 ` Pingfan Liu
2018-12-05 9:40 ` Vlastimil Babka
2018-12-06 3:07 ` Pingfan Liu [this message]
2018-12-06 8:28 ` Michal Hocko
2018-12-06 10:03 ` Pingfan Liu
2018-12-06 10:44 ` Pingfan Liu
2018-12-06 12:11 ` Michal Hocko
2018-12-07 2:56 ` Pingfan Liu
2018-12-07 7:53 ` Michal Hocko
2018-12-07 9:40 ` Pingfan Liu
2018-12-07 11:30 ` Michal Hocko
2018-12-07 13:20 ` Pingfan Liu
2018-12-07 14:22 ` Michal Hocko
2018-12-07 14:27 ` Pingfan Liu
2018-12-07 14:50 ` Michal Hocko
2018-12-07 15:56 ` Michal Hocko
2018-12-10 4:00 ` Pingfan Liu
2018-12-10 7:57 ` Pingfan Liu
2018-12-10 12:37 ` Michal Hocko
2018-12-11 8:05 ` Pingfan Liu
2018-12-11 9:44 ` Michal Hocko
2018-12-12 8:33 ` Pingfan Liu
2018-12-12 8:31 ` Pingfan Liu
2018-12-12 11:53 ` Michal Hocko
2018-12-13 8:37 ` Pingfan Liu
2018-12-13 9:04 ` Pingfan Liu
2018-12-17 13:29 ` Michal Hocko
2018-12-20 7:19 ` Pingfan Liu
2018-12-20 9:19 ` Michal Hocko
2019-01-08 14:34 ` Michal Hocko
2019-01-09 3:13 ` Pingfan Liu
2019-01-11 3:12 ` Pingfan Liu
2019-01-11 9:23 ` Michal Hocko
2018-12-17 12:57 ` Michal Hocko
2018-12-05 9:43 ` Michal Hocko
2018-12-06 3:34 ` Pingfan Liu
2018-12-06 7:23 ` Michal Hocko
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