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authorRik van Riel <riel@redhat.com>2008-04-29 00:59:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:03 -0700
commit5045bcae0fb466a1dbb6af0036e56901fd7aafb7 (patch)
tree3ad84c429ff74ec0f541cc7cf05ab3788114022f /Documentation/sysrq.txt
parent6e574195b75543bc6a6240306313988b1952470c (diff)
downloadlinux-linaro-stable-5045bcae0fb466a1dbb6af0036e56901fd7aafb7.tar.gz
sysrq: add show-backtrace-on-all-cpus function
SysRQ-P is not always useful on SMP systems, since it usually ends up showing the backtrace of a CPU that is doing just fine, instead of the backtrace of the CPU that is having problems. This patch adds SysRQ show-all-cpus(L), which shows the backtrace of every active CPU in the system. It skips idle CPUs because some SMP systems are just too large and we already know what the backtrace of the idle task looks like. [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Rik van Riel <riel@redhat.com> Randy Dunlap <randy.dunlap@oracle.com> Cc: <lwoodman@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/sysrq.txt')
-rw-r--r--Documentation/sysrq.txt2
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/sysrq.txt b/Documentation/sysrq.txt
index 10c8f6922ef4..5ce0952aa065 100644
--- a/Documentation/sysrq.txt
+++ b/Documentation/sysrq.txt
@@ -85,6 +85,8 @@ On all - write a character to /proc/sysrq-trigger. e.g.:
'k' - Secure Access Key (SAK) Kills all programs on the current virtual
console. NOTE: See important comments below in SAK section.
+'l' - Shows a stack backtrace for all active CPUs.
+
'm' - Will dump current memory info to your console.
'n' - Used to make RT tasks nice-able