linux-kernel - Re: [PATCH v2] x86,mm: print likely CPU at segfault time

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Message-ID: <17b83f59efbc568c1fe3154f82a5300f3b4cfe24.camel@surriel.com>
Date:   Thu, 04 Aug 2022 23:01:56 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Dave Hansen <dave.hansen@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Thomas Gleixner <tglx@...utronix.de>, Dave Jones <dsj@...com>,
        Andy Lutomirski <luto@...nel.org>
Subject: Re: [PATCH v2]  x86,mm: print likely CPU at segfault time

On Thu, 2022-08-04 at 22:17 +0200, Ingo Molnar wrote:
> 
> I've added the tidbit to the changelog that this only gets printed if
> show_unhandled_signals (/proc/sys/kernel/print-fatal-signals) is

The show_unhandled_signals variable seems to be controlled
through /proc/sys/debug/exception-trace, and be on by default.

Enabling print-fatal-signals makes the kernel a lot more
chatty, and does not offer the same value in my experiments :)

> enabled - 
> which is off by default. So your patch expands upon a default-off
> debug 
> printout in essence - where utility maximization is OK.
> 
> Thanks,
> 
>         Ingo
> 

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