I have (for example) this log entry in
[600711.395348] do_trap: 6 callbacks suppressed
Is there a possibility to convert this 'dmesg' time to 'real' time to know, when this event happend?
It looks as if it was implemented recently for Quantal (12.10) : see http://brainstorm.ubuntu.com/idea/17829/ .
dmesg is reported to have a new switch
Edit. As another extension on Ignacio's answer, here are some scripts to enhance dmesg output on older systems.
( Note: for the python version of the code shown there, one will want to replace
> back to
<> to make it usable again. )
Finally, for a single value like
600711.395348 one could do
ut=`cut -d' ' -f1 </proc/uptime` ts=`date +%s` date -d"70-1-1 + $ts sec - $ut sec + 600711.395348 sec" +"%F %T"
and get the event date and time.
( Please note that due to round-off errors the last second digit probably won't be accurate. ) .
Edit(2): Please note that -- as per Womble's comment below, -- this will only work if the machine was not hibernated etc. ( In that case, one shall better look at
syslog configs at
/etc/*syslog* and check the appropriate files. See also: dmesg vs /var/messages . )
To extend on Ignacio's answer, the entries contained in
dmesg are typically also logged elsewhere on the system, via syslog, which will give you a "real" timestamp. Unless Ubuntu have changed the Debian-set default, the log entries should be in
The time given in dmesg is in seconds since kernel startup. So, just add that many seconds to when the kernel started running (hint: uptime).
I know this is now old but dmesg now has a built in -e or --reatime option to display the time in the local time.
root@bbs:/var/log# dmesg|tail -1 [50755952.379177] Out of memory in UB 1593: OOM killed process 3183 (sbbs) score 0 vm:747204kB, rss:242764kB, swap:88224kB root@bbs:/var/log# dmesg -e|tail -1 [Feb20 17:10] Out of memory in UB 1593: OOM killed process 3183 (sbbs) score 0 vm:747204kB, rss:242764kB, swap:88224kB
On busybox, the 3 liner above didn't work, so here is my way to calculate it one off (replace
1628880.0 with your
perl -e '@a=split(`/proc/uptime`);print scalar(localtime(time()+$a - 1628880.0)."\n");'
dmesg | perl -pe 'use Unix::Uptime; s/^\[(.*)\]/localtime(time()-Unix::Uptime->uptime()+$1)/e'