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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2015-04-24 13:27:23 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2015-04-24 13:46:58 +0200 |
| commit | 016d2ca03c9d6cb33cb67cf3ad6ea1a9c5aab310 (patch) | |
| tree | f88fa37851cd0171e3d553399f8609bf5c29f6c6 /man7/bootparam.7 | |
| parent | 0b32bd2cf27a9c40c81c5ac0ac0d0b2e44e63c75 (diff) | |
| download | man-pages-016d2ca03c9d6cb33cb67cf3ad6ea1a9c5aab310.tar.gz | |
bootparam.7: Update discussion of 'debug' option
See https://bugzilla.kernel.org/show_bug.cgi?id=97161
Reported-by: Alain Kalker <a.c.kalker@gmail.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/bootparam.7')
| -rw-r--r-- | man7/bootparam.7 | 31 |
1 files changed, 20 insertions, 11 deletions
diff --git a/man7/bootparam.7 b/man7/bootparam.7 index cb860a6143..2ebed6fc2e 100644 --- a/man7/bootparam.7 +++ b/man7/bootparam.7 @@ -259,21 +259,30 @@ of CPUs activated in SMP mode to N. .SS Boot arguments for use by kernel developers .TP .B "'debug'" -Kernel messages are handed off to the kernel log daemon klogd so that they -may be logged to disk. +Kernel messages are handed off to a daemon (e.g., +.BR klogd (8) +or similar) so that they may be logged to disk. Messages with a priority above .I console_loglevel are also printed on the console. -(For these levels, see -.IR <linux/kernel.h> .) -By default, this variable is set to log anything more important than -debug messages. +(For a discussion of these levels, see +.BR syslog (2).) +By default, +.I console_loglevel +is set to log messages at levels higher than +.BR KERN_DEBUG . This boot argument will cause the kernel to also -print the messages of DEBUG priority. -The console loglevel can also be set at run time via an option -to klogd. -See -.BR klogd (8). +print messages logged at level +.BR KERN_DEBUG . +The console loglevel can also be set on a booted system via the +.IR /proc/sys/kernel/printk +file (described in +.BR syslog (2)), +the +.BR syslog (2) +.B SYSLOG_ACTION_CONSOLE_LEVEL +operation, or +.BR dmesg (8). .TP .B "'profile=N'" It is possible to enable a kernel profiling function, |