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| author |   Feng Tang <feng.tang@intel.com> | 2019-01-03 15:28:20 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2019-01-04 13:13:47 -0800 |
| commit | 81c9d43f94870be66146739c6e61df40dc17bb64 (patch) | |
| tree | 0209bcac3a8833b99e6b53d0e062667891e09f70 /Documentation | |
| parent | panic: add options to print system info when panic happens (diff) | |
| download | linux-dev-81c9d43f94870be66146739c6e61df40dc17bb64.tar.xz linux-dev-81c9d43f94870be66146739c6e61df40dc17bb64.zip | |
kernel/sysctl: add panic_print into sysctl
So that we can also runtime chose to print out the needed system info
for panic, other than setting the kernel cmdline.
Link: http://lkml.kernel.org/r/1543398842-19295-3-git-send-email-feng.tang@intel.com
Signed-off-by: Feng Tang <feng.tang@intel.com>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 1b8775298cf7..c0527d8a468a 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -60,6 +60,7 @@ show up in /proc/sys/kernel: - panic_on_stackoverflow - panic_on_unrecovered_nmi - panic_on_warn +- panic_print - panic_on_rcu_stall - perf_cpu_time_max_percent - perf_event_paranoid @@ -654,6 +655,22 @@ a kernel rebuild when attempting to kdump at the location of a WARN(). ============================================================== +panic_print: + +Bitmask for printing system info when panic happens. User can chose +combination of the following bits: + +bit 0: print all tasks info +bit 1: print system memory info +bit 2: print timer info +bit 3: print locks info if CONFIG_LOCKDEP is on +bit 4: print ftrace buffer + +So for example to print tasks and memory info on panic, user can: + echo 3 > /proc/sys/kernel/panic_print + +============================================================== + panic_on_rcu_stall: When set to 1, calls panic() after RCU stall detection messages. This |