From: Tejun Heo <tj@kernel.org>
To: Tang Chen <tangchen@cn.fujitsu.com>
Cc: tglx@linutronix.de, mingo@elte.hu, hpa@zytor.com,
akpm@linux-foundation.org, trenn@suse.de, yinghai@kernel.org,
jiang.liu@huawei.com, wency@cn.fujitsu.com, laijs@cn.fujitsu.com,
isimatu.yasuaki@jp.fujitsu.com, mgorman@suse.de,
minchan@kernel.org, mina86@mina86.com, gong.chen@linux.intel.com,
vasilis.liaskovitis@profitbricks.com, lwoodman@redhat.com,
riel@redhat.com, jweiner@redhat.com, prarit@redhat.com,
x86@kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
David Rientjes <rientjes@google.com>
Subject: Re: [Part1 PATCH v5 16/22] x86, mm, numa: Move numa emulation handling down.
Date: Mon, 17 Jun 2013 18:58:06 -0700 [thread overview]
Message-ID: <20130618015806.GY32663@mtj.dyndns.org> (raw)
In-Reply-To: <1371128589-8953-17-git-send-email-tangchen@cn.fujitsu.com>
On Thu, Jun 13, 2013 at 09:03:03PM +0800, Tang Chen wrote:
> From: Yinghai Lu <yinghai@kernel.org>
>
> numa_emulation() needs to allocate buffer for new numa_meminfo
> and distance matrix, so execute it later in x86_numa_init().
>
> Also we change the behavoir:
> - before this patch, if user input wrong data in command
> line, it will fall back to next numa probing or disabling
> numa.
> - after this patch, if user input wrong data in command line,
> it will stay with numa info probed from previous probing,
> like ACPI SRAT or amd_numa.
>
> We need to call numa_check_memblks to reject wrong user inputs early
> so that we can keep the original numa_meminfo not changed.
So, this is another very subtle ordering you're adding without any
comment and I'm not sure it even makes sense because the function can
fail after that point.
I'm getting really doubtful about this whole approach of carefully
splitting discovery and registration. It's inherently fragile like
hell and the poor documentation makes it a lot worse. I'm gonna reply
to the head message.
Thanks.
--
tejun
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next prev parent reply other threads:[~2013-06-18 1:58 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-13 13:02 [Part1 PATCH v5 00/22] x86, ACPI, numa: Parse numa info earlier Tang Chen
2013-06-13 13:02 ` [Part1 PATCH v5 01/22] x86: Change get_ramdisk_{image|size}() to global Tang Chen
2013-06-13 13:02 ` [Part1 PATCH v5 02/22] x86, microcode: Use common get_ramdisk_{image|size}() Tang Chen
2013-06-13 13:02 ` [Part1 PATCH v5 03/22] x86, ACPI, mm: Kill max_low_pfn_mapped Tang Chen
2013-06-17 21:04 ` Tejun Heo
2013-06-17 21:13 ` Yinghai Lu
2013-06-17 23:08 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 04/22] x86, ACPI: Search buffer above 4GB in a second try for acpi initrd table override Tang Chen
2013-06-17 21:06 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 05/22] x86, ACPI: Increase acpi initrd override tables number limit Tang Chen
2013-06-13 13:02 ` [Part1 PATCH v5 06/22] x86, ACPI: Split acpi_initrd_override() into find/copy two steps Tang Chen
2013-06-13 13:02 ` [Part1 PATCH v5 07/22] x86, ACPI: Store override acpi tables phys addr in cpio files info array Tang Chen
2013-06-17 23:38 ` Tejun Heo
2013-06-17 23:40 ` Yinghai Lu
2013-06-17 23:52 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 08/22] x86, ACPI: Make acpi_initrd_override_find work with 32bit flat mode Tang Chen
2013-06-18 0:07 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 09/22] x86, ACPI: Find acpi tables in initrd early from head_32.S/head64.c Tang Chen
2013-06-18 0:33 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 10/22] x86, mm, numa: Move two functions calling on successful path later Tang Chen
2013-06-18 0:53 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 11/22] x86, mm, numa: Call numa_meminfo_cover_memory() checking early Tang Chen
2013-06-18 1:05 ` Tejun Heo
2013-06-13 13:02 ` [Part1 PATCH v5 12/22] x86, mm, numa: Move node_map_pfn_alignment() to x86 Tang Chen
2013-06-18 1:08 ` Tejun Heo
2013-06-13 13:03 ` [Part1 PATCH v5 13/22] x86, mm, numa: Use numa_meminfo to check node_map_pfn alignment Tang Chen
2013-06-18 1:40 ` Tejun Heo
2013-06-13 13:03 ` [Part1 PATCH v5 14/22] x86, mm, numa: Set memblock nid later Tang Chen
2013-06-18 1:45 ` Tejun Heo
2013-06-13 13:03 ` [Part1 PATCH v5 15/22] x86, mm, numa: Move node_possible_map setting later Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 16/22] x86, mm, numa: Move numa emulation handling down Tang Chen
2013-06-18 1:58 ` Tejun Heo [this message]
2013-06-18 6:22 ` Yinghai Lu
2013-06-18 7:13 ` Yinghai Lu
2013-06-19 21:25 ` Yinghai Lu
2013-06-13 13:03 ` [Part1 PATCH v5 17/22] x86, ACPI, numa, ia64: split SLIT handling out Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 18/22] x86, mm, numa: Add early_initmem_init() stub Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 19/22] x86, mm: Parse numa info earlier Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 20/22] x86, mm: Add comments for step_size shift Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 21/22] x86, mm: Make init_mem_mapping be able to be called several times Tang Chen
2013-06-13 18:35 ` Konrad Rzeszutek Wilk
2013-06-13 22:47 ` Yinghai Lu
2013-06-14 5:08 ` Tang Chen
2013-06-13 13:03 ` [Part1 PATCH v5 22/22] x86, mm, numa: Put pagetable on local node ram for 64bit Tang Chen
2013-06-18 2:03 ` [Part1 PATCH v5 00/22] x86, ACPI, numa: Parse numa info earlier Tejun Heo
2013-06-18 5:47 ` Tang Chen
2013-06-18 17:21 ` Tejun Heo
2013-06-20 5:52 ` Tang Chen
2013-06-20 6:17 ` Tejun Heo
2013-06-21 9:19 ` Tang Chen
2013-06-21 18:25 ` Tejun Heo
2013-06-24 3:51 ` Tang Chen
2013-06-24 7:26 ` Tang Chen
2013-06-24 19:59 ` Tejun Heo
2013-06-18 17:10 ` Vasilis Liaskovitis
2013-06-18 20:19 ` Yinghai Lu
2013-06-19 10:05 ` Vasilis Liaskovitis
2013-06-20 18:42 ` Yinghai Lu
2013-06-24 9:40 ` Gu Zheng
2013-06-21 5:19 ` H. Peter Anvin
2013-06-21 6:06 ` Tang Chen
2013-06-21 6:10 ` H. Peter Anvin
2013-06-21 6:20 ` Tang Chen
2013-06-21 6:26 ` Tejun Heo
2013-06-21 20:18 ` Yinghai Lu
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