linux-kernel - Re: rlimits: Print more information when CPU/RT limits are exceeded

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Message-ID: <20170504133225.jatemh6hy3xhvpk5@codemonkey.org.uk>
Date:   Thu, 4 May 2017 09:32:25 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Arun Raghavan <arun@...nraghavan.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: rlimits: Print more information when CPU/RT limits are exceeded

On Thu, May 04, 2017 at 10:08:16AM +0530, Arun Raghavan wrote:
 > On Tue, 2 May 2017, at 08:42 AM, Dave Jones wrote:
 > > On Mon, May 01, 2017 at 11:21:52PM +0000, Linux Kernel wrote:
 > >  > Web:        https://git.kernel.org/torvalds/c/e7ea7c9806a2681807257ea89085339d33f7fa0b
 > >  > Commit:     e7ea7c9806a2681807257ea89085339d33f7fa0b
 > >  > Parent:     4495c08e84729385774601b5146d51d9e5849f81
 > >  > Refname:    refs/heads/master
 > >  > Author:     Arun Raghavan <arun@...nraghavan.net>
 > >  > AuthorDate: Wed Mar 1 20:23:09 2017 +0530
 > >  > Committer:  Thomas Gleixner <tglx@...utronix.de>
 > >  > CommitDate: Mon Mar 13 21:32:15 2017 +0100
 > >  > 
 > >  >     rlimits: Print more information when CPU/RT limits are exceeded
 > >  >     
 > >  >     When a process is sent a SIGKILL because it exceeded CPU or RT limits,
 > >  >     the cause may not be obvious in userspace -- daemonised processes just
 > >  >     get killed, and even foreground process just see a 'Killed' message. The
 > >  >     lack of any information on why this might be happening in logs can be
 > >  >     confusing to users who are not aware of this mechanism.
 > >  >     
 > >  >     Add messages which dump the process name and tid in dmesg when a process
 > >  >     exceeds its CPU or RT limits (soft and hard) in order to make it clearer to
 > >  >     people debugging such issues.
 > >  >     
 > >  >     Signed-off-by: Arun Raghavan <arun@...nraghavan.net>
 > >  >     Link: http://lkml.kernel.org/r/20170301145309.27214-1-arun@arunraghavan.net
 > >  >     Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
 > > 
 > > This needs to be configurable, because this is really obnoxious..
 > 
 > Is there an example of hos this is done elsewhere that I can work off?

The obvious one to me that comes to mind is /proc/sys/kernel/print-fatal-signals

	Dave