On Sat, 2015-05-30 at 11:45 -0400, Dave Anderson wrote: > > ----- Original Message ----- > > It would be useful to have the ability to dump out only certain log > > levels of the kernel log. I know dmesg has '-m' which prepends the log > > level and then you can always use some script logic but would it be easy > > to add another option in crash to do this automatically? > > Not particularly easy. In the case of the older pre-variable-length-record > format, > the code walks through the log buffer character by character, and prunes any > code between the angle-brackets unless -m is in play. So there's no > line-by-line > handling involved for the older kernels. And it would be trival to use -m > and simply > grep for the relevant "<#>" at the beginning of each output line. > > In the case of variable-length records, it's even uglier because the > structure format > used has changed several times, where it used to have its own structure > member, and > then was changed to use multiple different bitmaps-inside-integers. For that > reason > alone, I purposely decided to throw in the towel and go with a hexadecimal > dump of the > relevant field or all-inclusive member with -m, whichever is applicable. It > would be > a PITA to have to handle all the different structural differences. > > So in both cases, it's obviously not impossible, but would be kind of ugly. > > Dave > > > > -l level Only display log messages matching 'level', which may be specified > > as a single number (3) or a range (0-3). >
Ok yeah I'm using this right now: crash> dmesg -m | grep ^\<[01234]\> Trying to get away from the extra commands where possible but if it's too much trouble no biggie. Thanks for looking / explaining. -- Crash-utility mailing list [email protected] https://www.redhat.com/mailman/listinfo/crash-utility
