From: Jan Beulich <jbeulich@suse.com>
To: Julien Grall <julien@xen.org>, Wei Chen <Wei.Chen@arm.com>
Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"sstabellini@kernel.org" <sstabellini@kernel.org>
Subject: Re: [XEN RFC PATCH 26/40] xen/arm: Add boot and secondary CPU to NUMA system
Date: Thu, 26 Aug 2021 11:39:51 +0200 [thread overview]
Message-ID: <705eae88-2cb1-f3a5-3190-dd4ed553fe36@suse.com> (raw)
In-Reply-To: <d7ea4260-aec5-efb5-32e7-7f73d6ee206b@xen.org>
On 26.08.2021 10:49, Julien Grall wrote:
> On 26/08/2021 08:24, Wei Chen wrote:
>>> -----Original Message-----
>>> From: Julien Grall <julien@xen.org>
>>> Sent: 2021年8月26日 0:58
>>> On 11/08/2021 11:24, Wei Chen wrote:
>>>> --- a/xen/arch/arm/smpboot.c
>>>> +++ b/xen/arch/arm/smpboot.c
>>>> @@ -358,6 +358,12 @@ void start_secondary(void)
>>>> */
>>>> smp_wmb();
>>>>
>>>> + /*
>>>> + * If Xen is running on a NUMA off system, there will
>>>> + * be a node#0 at least.
>>>> + */
>>>> + numa_add_cpu(cpuid);
>>>> +
>>>
>>> On x86, numa_add_cpu() will be called before the pCPU is brought up. I
>>> am not quite too sure why we are doing it differently here. Can you
>>> clarify it?
>>
>> Of course we can invoke numa_add_cpu before cpu_up as x86. But in my tests,
>> I found when cpu bring up failed, this cpu still be add to NUMA. Although
>> this does not affect the execution of the code (because CPU is offline),
>> But I don't think adding a offline CPU to NUMA makes sense.
>
> Right, but again, why do you want to solve the problem on Arm and not
> x86? After all, NUMA is not architecture specific (in fact you move most
> of the code in common).
>
> In fact, the risk, is someone may read arch/x86 and doesn't realize the
> CPU is not in the node until late on Arm.
>
> So I think we should call numa_add_cpu() around the same place on all
> the architectures.
FWIW: +1
Jan
next prev parent reply other threads:[~2021-08-26 9:40 UTC|newest]
Thread overview: 196+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-11 10:23 [XEN RFC PATCH 00/40] Add device tree based NUMA support to Arm64 Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 01/40] tools: Fix -Werror=maybe-uninitialized for xlu_pci_parse_bdf Wei Chen
2021-08-11 10:49 ` Jan Beulich
2021-08-13 6:28 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 02/40] xen/arm: Print a 64-bit number in hex from early uart Wei Chen
2021-08-19 13:05 ` Julien Grall
2021-08-20 1:13 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 03/40] xen/x86: Initialize memnodemapsize while faking NUMA node Wei Chen
2021-08-12 15:32 ` Jan Beulich
2021-08-13 7:26 ` Wei Chen
2021-08-13 8:29 ` Jan Beulich
2021-08-11 10:23 ` [XEN RFC PATCH 04/40] xen/arm: return default DMA bit width when platform is not set Wei Chen
2021-08-11 10:54 ` Jan Beulich
2021-08-13 6:54 ` Wei Chen
2021-08-13 6:56 ` Jan Beulich
2021-08-19 13:28 ` Julien Grall
2021-08-20 2:04 ` Wei Chen
2021-08-20 8:20 ` Julien Grall
2021-08-20 9:37 ` Wei Chen
2021-08-20 11:18 ` Julien Grall
2021-08-20 11:58 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 05/40] xen/arm: Fix lowmem_bitsize when arch_get_dma_bitsize return 0 Wei Chen
2021-08-19 13:32 ` Julien Grall
2021-08-20 2:05 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 06/40] xen: decouple NUMA from ACPI in Kconfig Wei Chen
2021-08-12 15:36 ` Jan Beulich
2021-08-13 7:27 ` Wei Chen
2021-08-12 16:54 ` Julien Grall
2021-08-13 7:28 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 07/40] xen/arm: use !CONFIG_NUMA to keep fake NUMA API Wei Chen
2021-08-19 13:34 ` Julien Grall
2021-08-20 2:08 ` Wei Chen
2021-08-20 8:23 ` Julien Grall
2021-08-20 10:24 ` Wei Chen
2021-08-20 11:24 ` Julien Grall
2021-08-20 12:23 ` Wei Chen
2021-08-20 14:41 ` Julien Grall
2021-08-11 10:23 ` [XEN RFC PATCH 08/40] xen/x86: Move NUMA memory node map functions to common Wei Chen
2021-08-23 17:47 ` Julien Grall
2021-08-24 4:07 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 09/40] xen/x86: Move numa_add_cpu_node " Wei Chen
2021-08-23 17:54 ` Julien Grall
2021-08-24 4:18 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 10/40] xen/x86: Move NR_NODE_MEMBLKS macro " Wei Chen
2021-08-23 17:58 ` Julien Grall
2021-08-11 10:23 ` [XEN RFC PATCH 11/40] xen/x86: Move NUMA nodes and memory block ranges " Wei Chen
2021-08-24 17:40 ` Julien Grall
2021-08-25 0:57 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 12/40] xen/x86: Move numa_initmem_init " Wei Chen
2021-08-25 10:21 ` Julien Grall
2021-08-25 11:15 ` Wei Chen
2021-08-25 13:26 ` Julien Grall
2021-08-11 10:23 ` [XEN RFC PATCH 13/40] xen/arm: introduce numa_set_node for Arm Wei Chen
2021-08-25 10:36 ` Julien Grall
2021-08-25 12:07 ` Wei Chen
2021-08-25 13:24 ` Julien Grall
2021-08-26 5:13 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 14/40] xen/arm: set NUMA nodes max number to 64 by default Wei Chen
2021-08-25 13:28 ` Julien Grall
2021-08-25 13:36 ` Jan Beulich
2021-08-26 2:26 ` Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 15/40] xen/x86: move NUMA API from x86 header to common header Wei Chen
2021-08-11 10:23 ` [XEN RFC PATCH 16/40] xen/arm: Create a fake NUMA node to use common code Wei Chen
2021-08-26 23:10 ` Stefano Stabellini
2021-08-27 1:15 ` Wei Chen
2021-08-27 6:18 ` Jan Beulich
2021-08-27 9:32 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 17/40] xen/arm: Introduce DEVICE_TREE_NUMA Kconfig for arm64 Wei Chen
2021-08-19 13:38 ` Julien Grall
2021-08-20 2:30 ` Wei Chen
2021-08-20 8:41 ` Julien Grall
2021-08-20 10:49 ` Wei Chen
2021-08-20 11:28 ` Julien Grall
2021-08-20 12:25 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 18/40] xen/arm: Keep memory nodes in dtb for NUMA when boot from EFI Wei Chen
2021-08-19 17:35 ` Julien Grall
2021-08-20 2:18 ` Wei Chen
2021-08-26 23:24 ` Stefano Stabellini
2021-08-27 7:41 ` Julien Grall
2021-08-27 23:10 ` Stefano Stabellini
2021-08-27 9:23 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 19/40] xen: fdt: Introduce a helper to check fdt node type Wei Chen
2021-08-25 13:39 ` Julien Grall
2021-08-26 6:00 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 20/40] xen/arm: implement node distance helpers for Arm64 Wei Chen
2021-08-26 23:52 ` Stefano Stabellini
2021-08-27 9:30 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 21/40] xen/arm: introduce device_tree_numa as a switch for device tree NUMA Wei Chen
2021-08-19 17:45 ` Julien Grall
2021-08-20 2:21 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 22/40] xen/arm: introduce a helper to parse device tree processor node Wei Chen
2021-08-19 18:09 ` Julien Grall
2021-08-23 8:42 ` Wei Chen
2021-08-19 18:10 ` Julien Grall
2021-08-23 8:47 ` Wei Chen
2021-08-23 10:59 ` Julien Grall
2021-08-24 4:09 ` Wei Chen
2021-08-19 18:13 ` Julien Grall
2021-08-20 2:23 ` Wei Chen
2021-08-20 8:44 ` Julien Grall
2021-08-20 11:53 ` Wei Chen
2021-08-27 0:06 ` Stefano Stabellini
2021-08-27 9:31 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 23/40] xen/arm: introduce a helper to parse device tree memory node Wei Chen
2021-08-25 13:48 ` Julien Grall
2021-08-26 6:35 ` Wei Chen
2021-08-26 8:21 ` Julien Grall
2021-08-26 11:54 ` Wei Chen
2021-08-28 1:06 ` Stefano Stabellini
2021-08-28 3:56 ` Wei Chen
2021-08-28 10:33 ` Julien Grall
2021-08-28 13:58 ` Wei Chen
2021-09-08 7:34 ` Wei Chen
2021-09-08 22:31 ` Stefano Stabellini
2021-09-09 3:54 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 24/40] xen/arm: introduce a helper to parse device tree NUMA distance map Wei Chen
2021-08-25 13:56 ` Julien Grall
2021-08-26 7:01 ` Wei Chen
2021-08-31 0:48 ` Stefano Stabellini
2021-08-31 10:17 ` Wei Chen
2021-08-31 21:36 ` Stefano Stabellini
2021-09-01 11:04 ` Wei Chen
2021-09-01 16:21 ` Stefano Stabellini
2021-09-02 2:30 ` Wei Chen
2021-09-02 15:19 ` Stefano Stabellini
2021-09-02 6:00 ` Jan Beulich
2021-09-02 14:14 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 25/40] xen/arm: unified entry to parse all NUMA data from device tree Wei Chen
2021-08-31 0:54 ` Stefano Stabellini
2021-08-31 17:47 ` Julien Grall
2021-09-01 18:30 ` Stefano Stabellini
2021-09-02 2:48 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 26/40] xen/arm: Add boot and secondary CPU to NUMA system Wei Chen
2021-08-25 16:58 ` Julien Grall
2021-08-26 7:24 ` Wei Chen
2021-08-26 8:49 ` Julien Grall
2021-08-26 9:39 ` Jan Beulich [this message]
2021-08-26 12:08 ` Wei Chen
2021-08-26 12:26 ` Jan Beulich
2021-08-11 10:24 ` [XEN RFC PATCH 27/40] xen/arm: build CPU NUMA node map while creating cpu_logical_map Wei Chen
2021-08-25 17:06 ` Julien Grall
2021-08-26 7:26 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 28/40] xen/x86: decouple nodes_cover_memory with E820 map Wei Chen
2021-08-31 1:07 ` Stefano Stabellini
2021-08-31 10:19 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 29/40] xen/arm: implement Arm arch helpers Arm to get memory map info Wei Chen
2021-08-25 17:09 ` Julien Grall
2021-08-26 7:27 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 30/40] xen: move NUMA memory and CPU parsed nodemasks to common Wei Chen
2021-08-25 17:16 ` Julien Grall
2021-08-26 7:29 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 31/40] xen/x86: move nodes_cover_memory " Wei Chen
2021-08-31 1:16 ` Stefano Stabellini
2021-08-31 13:43 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 32/40] xen/x86: make acpi_scan_nodes to be neutral Wei Chen
2021-08-27 14:08 ` Julien Grall
2021-08-28 2:11 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 33/40] xen: export bad_srat and srat_disabled to extern Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 34/40] xen: move numa_scan_nodes from x86 to common Wei Chen
2021-08-27 14:14 ` Julien Grall
2021-08-28 2:12 ` Wei Chen
2021-08-31 1:26 ` Stefano Stabellini
2021-08-31 13:43 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 35/40] xen: enable numa_scan_nodes for device tree based NUMA Wei Chen
2021-08-27 14:19 ` Julien Grall
2021-08-28 2:13 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 36/40] xen/arm: keep guest still be NUMA unware Wei Chen
2021-08-27 14:28 ` Julien Grall
2021-08-28 2:19 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 37/40] xen: introduce an arch helper to do NUMA init failed fallback Wei Chen
2021-08-27 14:30 ` Julien Grall
2021-08-28 3:09 ` Wei Chen
2021-08-28 3:45 ` Wei Chen
2021-08-30 9:52 ` Jan Beulich
2021-08-30 10:38 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 38/40] xen/arm: enable device tree based NUMA in system init Wei Chen
2021-08-27 14:32 ` Julien Grall
2021-08-28 3:17 ` Wei Chen
2021-08-28 10:45 ` Julien Grall
2021-08-28 14:02 ` Wei Chen
2021-08-31 1:50 ` Stefano Stabellini
2021-08-31 13:43 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 39/40] xen/x86: move numa_setup to common to support NUMA switch in command line Wei Chen
2021-08-27 14:37 ` Julien Grall
2021-08-28 3:22 ` Wei Chen
2021-08-31 1:53 ` Stefano Stabellini
2021-08-31 13:44 ` Wei Chen
2021-08-11 10:24 ` [XEN RFC PATCH 40/40] xen/x86: move dump_numa info hotkey to common Wei Chen
2021-08-11 10:41 ` [XEN RFC PATCH 00/40] Add device tree based NUMA support to Arm64 Jan Beulich
2021-08-13 2:33 ` Wei Chen
2021-08-13 6:53 ` Jan Beulich
2021-08-19 13:42 ` Julien Grall
2021-08-19 14:05 ` Bertrand Marquis
2021-08-19 17:11 ` Julien Grall
2021-08-26 0:09 ` Stefano Stabellini
2021-08-26 7:31 ` Wei Chen
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