diff options
| author | Kay Sievers <kay@vrfy.org> | 2012-05-10 04:30:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-09 20:35:06 -0700 |
| commit | 649e6ee33f73ba1c4f2492c6de9aff2254b540cb (patch) | |
| tree | f7fe1b11f4eb7c306a07a8893980a5d34a0886d9 /lib/Kconfig.debug | |
| parent | 5c5d5ca51abd728c8de3be43ffd6bb00f977bfcd (diff) | |
| download | lwn-649e6ee33f73ba1c4f2492c6de9aff2254b540cb.tar.gz lwn-649e6ee33f73ba1c4f2492c6de9aff2254b540cb.zip | |
printk() - restore timestamp printing at console output
The output of the timestamps got lost with the conversion of the
kmsg buffer to records; restore the old behavior.
Document, that CONFIG_PRINTK_TIME now only controls the output of
the timestamps in the syslog() system call and on the console, and
not the recording of the timestamps.
Cc: Joe Perches <joe@perches.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Sasha Levin <levinsasha928@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Reported-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index ef8192bc0c33..e11934177030 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -3,12 +3,16 @@ config PRINTK_TIME bool "Show timing information on printks" depends on PRINTK help - Selecting this option causes timing information to be - included in printk output. This allows you to measure - the interval between kernel operations, including bootup - operations. This is useful for identifying long delays - in kernel startup. Or add printk.time=1 at boot-time. - See Documentation/kernel-parameters.txt + Selecting this option causes time stamps of the printk() + messages to be added to the output of the syslog() system + call and at the console. + + The timestamp is always recorded internally, and exported + to /dev/kmsg. This flag just specifies if the timestamp should + be included, not that the timestamp is recorded. + + The behavior is also controlled by the kernel command line + parameter printk.time=1. See Documentation/kernel-parameters.txt config DEFAULT_MESSAGE_LOGLEVEL int "Default message log level (1-7)" |