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From: Thomas Gleixner <tglx@linutronix.de>
To: Rik van Riel <riel@surriel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
	Andy Lutomirski <luto@kernel.org>,
	kernel-team@fb.com, Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	x86@kernel.org
Subject: Re: [PATCH] x86,mm: print likely CPU at segfault time
Date: Wed, 21 Jul 2021 22:38:32 +0200	[thread overview]
Message-ID: <87pmvbpflj.ffs@nanos.tec.linutronix.de> (raw)
In-Reply-To: <a9f568139f0bd82cc8460c2c4f831f03a74f2a89.camel@surriel.com>

On Mon, Jul 19 2021 at 15:34, Rik van Riel wrote:

> On Mon, 2021-07-19 at 12:20 -0700, Dave Hansen wrote:
>
>> If it's as trivial as:
>> 
>>         printk(KERN_CONT " on cpu/core %d/%d",
>>                 raw_smp_processor_id(),
>>                 topology_core_id(raw_smp_processor_id()));
>> 
>> it would be handy.  But, it's also not hard to look at 10 segfaults,
>> see
>> that they happened only on 2 CPUs and realize that hyperthreading is
>> enabled.
>
> One problem with topology_core_id() is that that, on a
> multi-socket system, the core number may not be unique.

Just add topology_physical_package_id() and you have a complete picture.

Thanks,

        tglx

  reply	other threads:[~2021-07-21 20:38 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 19:00 Rik van Riel
2021-07-19 19:20 ` Dave Hansen
2021-07-19 19:34   ` Rik van Riel
2021-07-21 20:38     ` Thomas Gleixner [this message]
2021-07-21 20:36 ` Thomas Gleixner
2021-07-24  1:38   ` Rik van Riel

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