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| author | Chuck Ebbert <76306.1226@compuserve.com> | 2006-12-07 02:14:11 +0100 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 02:14:11 +0100 |
| commit | 0741f4d207a644482d7a040f05cd264c98cf7ee8 (patch) | |
| tree | 787f2fffc12871d0f19e492fc4258cda254aa42d | |
| parent | c7a3392e9e53e43c44a971de3dd480a8e2788e75 (diff) | |
| download | lwn-0741f4d207a644482d7a040f05cd264c98cf7ee8.tar.gz lwn-0741f4d207a644482d7a040f05cd264c98cf7ee8.zip | |
[PATCH] x86: add sysctl for kstack_depth_to_print
Add sysctl for kstack_depth_to_print. This lets users change
the amount of raw stack data printed in dump_stack() without
having to reboot.
Signed-off-by: Chuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: Andi Kleen <ak@suse.de>
| -rw-r--r-- | Documentation/sysctl/kernel.txt | 8 | ||||
| -rw-r--r-- | arch/i386/kernel/traps.c | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/traps.c | 2 | ||||
| -rw-r--r-- | include/asm-x86_64/stacktrace.h | 2 | ||||
| -rw-r--r-- | kernel/sysctl.c | 9 |
5 files changed, 21 insertions, 2 deletions
diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 0bc7f1e3c9e6..5922e84d9133 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -27,6 +27,7 @@ show up in /proc/sys/kernel: - hotplug - java-appletviewer [ binfmt_java, obsolete ] - java-interpreter [ binfmt_java, obsolete ] +- kstack_depth_to_print [ X86 only ] - l2cr [ PPC only ] - modprobe ==> Documentation/kmod.txt - msgmax @@ -170,6 +171,13 @@ This flag controls the L2 cache of G3 processor boards. If ============================================================== +kstack_depth_to_print: (X86 only) + +Controls the number of words to print when dumping the raw +kernel stack. + +============================================================== + osrelease, ostype & version: # cat osrelease diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index 7b2f9f022089..1d48a75fa338 100644 --- a/arch/i386/kernel/traps.c +++ b/arch/i386/kernel/traps.c @@ -91,7 +91,7 @@ asmlinkage void alignment_check(void); asmlinkage void spurious_interrupt_bug(void); asmlinkage void machine_check(void); -static int kstack_depth_to_print = 24; +int kstack_depth_to_print = 24; #ifdef CONFIG_STACK_UNWIND static int call_trace = 1; #else diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c index 264db33476ab..75ceccee178c 100644 --- a/arch/x86_64/kernel/traps.c +++ b/arch/x86_64/kernel/traps.c @@ -108,7 +108,7 @@ static inline void preempt_conditional_cli(struct pt_regs *regs) preempt_enable_no_resched(); } -static int kstack_depth_to_print = 12; +int kstack_depth_to_print = 12; #ifdef CONFIG_STACK_UNWIND static int call_trace = 1; #else diff --git a/include/asm-x86_64/stacktrace.h b/include/asm-x86_64/stacktrace.h index 5eb9799bef76..6f0b54594307 100644 --- a/include/asm-x86_64/stacktrace.h +++ b/include/asm-x86_64/stacktrace.h @@ -1,6 +1,8 @@ #ifndef _ASM_STACKTRACE_H #define _ASM_STACKTRACE_H 1 +extern int kstack_depth_to_print; + /* Generic stack tracer with callbacks */ struct stacktrace_ops { diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 09e569f4792b..6fc5e17086f4 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -54,6 +54,7 @@ extern int proc_nr_files(ctl_table *table, int write, struct file *filp, #ifdef CONFIG_X86 #include <asm/nmi.h> +#include <asm/stacktrace.h> #endif #if defined(CONFIG_SYSCTL) @@ -707,6 +708,14 @@ static ctl_table kern_table[] = { .mode = 0444, .proc_handler = &proc_dointvec, }, + { + .ctl_name = CTL_UNNUMBERED, + .procname = "kstack_depth_to_print", + .data = &kstack_depth_to_print, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, #endif #if defined(CONFIG_MMU) { |