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author | Ingo Molnar <mingo@elte.hu> | 2009-03-11 09:49:34 (GMT) |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-03-11 09:49:34 (GMT) |
commit | d95c3578120e5bc4784069439f00ccb1b5f87717 (patch) | |
tree | c819de31de3983f3d69f223ede07667ff23bf7da /Documentation/sysrq.txt | |
parent | ba1d755a36f66101aa88ac9ebb54694def6ec38d (diff) | |
parent | 78b020d035074fc3aa4d017353bb2c32e2aff56f (diff) | |
download | linux-d95c3578120e5bc4784069439f00ccb1b5f87717.tar.xz |
Merge branch 'x86/core' into cpus4096
Diffstat (limited to 'Documentation/sysrq.txt')
-rw-r--r-- | Documentation/sysrq.txt | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt index 10a0263..9e592c7 100644 --- a/Documentation/sysrq.txt +++ b/Documentation/sysrq.txt @@ -1,6 +1,5 @@ Linux Magic System Request Key Hacks Documentation for sysrq.c -Last update: 2007-AUG-04 * What is the magic SysRq key? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -211,6 +210,24 @@ within a function called by handle_sysrq, you must be aware that you are in a lock (you are also in an interrupt handler, which means don't sleep!), so you must call __handle_sysrq_nolock instead. +* When I hit a SysRq key combination only the header appears on the console? +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +Sysrq output is subject to the same console loglevel control as all +other console output. This means that if the kernel was booted 'quiet' +as is common on distro kernels the output may not appear on the actual +console, even though it will appear in the dmesg buffer, and be accessible +via the dmesg command and to the consumers of /proc/kmsg. As a specific +exception the header line from the sysrq command is passed to all console +consumers as if the current loglevel was maximum. If only the header +is emitted it is almost certain that the kernel loglevel is too low. +Should you require the output on the console channel then you will need +to temporarily up the console loglevel using alt-sysrq-8 or: + + echo 8 > /proc/sysrq-trigger + +Remember to return the loglevel to normal after triggering the sysrq +command you are interested in. + * I have more questions, who can I ask? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ And I'll answer any questions about the registration system you got, also |