linux-kernel - Re: ODEBUG: Out of memory. ODEBUG disabled

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Message-ID: <0181049f-55bd-b0ad-afe3-302272b69c73@linux.alibaba.com>
Date:   Fri, 9 Nov 2018 14:01:44 -0800
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Qian Cai <cai@....us>
Cc:     open list <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Waiman Long <longman@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Zhong Jiang <zhongjiang@...wei.com>
Subject: Re: ODEBUG: Out of memory. ODEBUG disabled



On 11/9/18 1:51 PM, Qian Cai wrote:
>
>> On Nov 9, 2018, at 4:42 PM, Yang Shi <yang.shi@...ux.alibaba.com> wrote:
>>
>>
>>
>> On 11/9/18 1:36 PM, Qian Cai wrote:
>>> It is a bit annoying on this aarch64 server with 64 CPUs that is
>>> booting the latest mainline (3541833fd1f2) causes object debugging
>>> always running out of memory.
>> May you please paste the detail failure log?
> I assume you mean dmesg.
>
> Here is the dmesg for 64 CPUs,
> https://paste.ubuntu.com/p/BnhvXXhn7k/

I don't see the oom message, it looks it boots up successfully with 64 CPUs.

>>> I have to boot the kernel with only 16 CPUs instead (nr_cpus=16)
>>> to make it work. Is it expected that object debugging is not going
>>> to work with large machines?
>> I don't think so. I'm supposed it works well with large CPU number on x86.
> Here is the one with nr_cpus workaround,
> https://paste.ubuntu.com/p/qMpd2CCPSV/