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

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Date:   Mon, 1 May 2017 23:12:30 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:     Arun Raghavan <arun@...nraghavan.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: rlimits: Print more information when CPU/RT limits are exceeded

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..

[  121.042170] RT Watchdog Timeout (hard): trinity-c40[7533]
[  125.670948] RT Watchdog Timeout (hard): trinity-c29[1612]
[  200.631968] CPU Watchdog Timeout (soft): trinity-c33[11454]
[  200.644308] CPU Watchdog Timeout (soft): trinity-c33[11454]
[  200.656551] CPU Watchdog Timeout (soft): trinity-c33[11454]
[  213.454504] CPU Watchdog Timeout (soft): trinity-c33[11454]
[  276.787116] CPU Watchdog Timeout (soft): trinity-c22[23943]
[  285.857773] CPU Watchdog Timeout (soft): trinity-c33[24908]
[  287.236710] CPU Watchdog Timeout (soft): trinity-c22[23943]
[  295.186400] CPU Watchdog Timeout (soft): trinity-c33[24908]
[  296.464352] CPU Watchdog Timeout (soft): trinity-c22[23943]
[  305.164011] CPU Watchdog Timeout (soft): trinity-c33[24908]
[  367.123564] CPU Watchdog Timeout (soft): trinity-c8[1472]
[  373.950321] CPU Watchdog Timeout (soft): trinity-c8[1472]
[  381.415054] CPU Watchdog Timeout (soft): trinity-c8[1472]
[  389.621759] CPU Watchdog Timeout (soft): trinity-c8[1472]
[  463.940996] CPU Watchdog Timeout (soft): trinity-c29[7725]
[  463.952215] CPU Watchdog Timeout (soft): trinity-c29[7725]
[  463.963306] CPU Watchdog Timeout (soft): trinity-c29[7725]
[  555.264401] RT Watchdog Timeout (hard): trinity-c58[19175]
[  610.536159] RT Watchdog Timeout (hard): trinity-c2[28363]
[  741.785688] CPU Watchdog Timeout (soft): trinity-c46[5034]
[  741.796600] CPU Watchdog Timeout (soft): trinity-c46[5034]
[  741.807384] CPU Watchdog Timeout (soft): trinity-c46[5034]
[  741.972679] CPU Watchdog Timeout (soft): trinity-c46[5034]
[  743.115630] CPU Watchdog Timeout (soft): trinity-c46[5034]
[  743.128628] CPU Watchdog Timeout (soft): trinity-c12[2803]
[  743.139032] CPU Watchdog Timeout (soft): trinity-c12[2803]
[  743.149276] CPU Watchdog Timeout (soft): trinity-c12[2803]
[  823.866183] CPU Watchdog Timeout (soft): trinity-c21[15684]
[  892.151230] CPU Watchdog Timeout (soft): trinity-c56[22668]
[  892.161239] CPU Watchdog Timeout (soft): trinity-c56[22668]
[  899.818894] CPU Watchdog Timeout (soft): trinity-c4[22072]
[  899.828718] CPU Watchdog Timeout (soft): trinity-c4[22072]
[  899.838439] CPU Watchdog Timeout (soft): trinity-c4[22072]
[  905.253660] CPU Watchdog Timeout (soft): trinity-c56[22668]
[  907.297573] CPU Watchdog Timeout (soft): trinity-c39[24134]
[  907.307170] CPU Watchdog Timeout (soft): trinity-c39[24134]
[  907.519560] CPU Watchdog Timeout (soft): trinity-c4[22072]
[  940.624120] RT Watchdog Timeout (hard): trinity-c34[30478]
[  959.189311] CPU Watchdog Timeout (soft): trinity-c61[31012]
[  968.873887] CPU Watchdog Timeout (soft): trinity-c61[31012]
[  980.305390] CPU Watchdog Timeout (soft): trinity-c61[31012]
[  992.532852] CPU Watchdog Timeout (soft): trinity-c61[31012]
[ 1032.126118] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1036.723920] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1046.628487] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1054.169156] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1064.102718] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1076.722166] CPU Watchdog Timeout (soft): trinity-c34[5861]
[ 1129.844831] CPU Watchdog Timeout (soft): trinity-c4[14714]
[ 1134.980606] CPU Watchdog Timeout (soft): trinity-c4[14714]
[ 1146.512098] CPU Watchdog Timeout (soft): trinity-c4[14714]
[ 1158.420576] CPU Watchdog Timeout (soft): trinity-c4[14714]
[ 1170.275054] CPU Watchdog Timeout (soft): trinity-c4[14714]


	Dave