Messages in this thread Patch in this message | | | Date | Sat, 25 Nov 2006 12:40:56 -0500 | From | Chuck Ebbert <> | Subject | [patch] X86: add sysctl for kstack_depth_to_print |
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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> --- Tested on i386; compiled on x86_64.
Documentation/sysctl/kernel.txt | 8 ++++++++ arch/i386/kernel/traps.c | 2 +- arch/x86_64/kernel/traps.c | 2 +- include/asm-x86_64/stacktrace.h | 2 ++ include/linux/sysctl.h | 1 + kernel/sysctl.c | 9 +++++++++ 6 files changed, 22 insertions(+), 2 deletions(-)
--- 2.6.19-rc6-32smp.orig/kernel/sysctl.c +++ 2.6.19-rc6-32smp/kernel/sysctl.c @@ -54,6 +54,7 @@ extern int proc_nr_files(ctl_table *tabl #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 = KERN_KSTACK_DEPTH_TO_PRINT, + .procname = "kstack_depth_to_print", + .data = &kstack_depth_to_print, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, #endif #if defined(CONFIG_MMU) { --- 2.6.19-rc6-32smp.orig/arch/i386/kernel/traps.c +++ 2.6.19-rc6-32smp/arch/i386/kernel/traps.c @@ -94,7 +94,7 @@ 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 --- 2.6.19-rc6-32smp.orig/include/asm-x86_64/stacktrace.h +++ 2.6.19-rc6-32smp/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 { --- 2.6.19-rc6-32smp.orig/include/linux/sysctl.h +++ 2.6.19-rc6-32smp/include/linux/sysctl.h @@ -160,6 +160,7 @@ enum KERN_MAX_LOCK_DEPTH=74, KERN_NMI_WATCHDOG=75, /* int: enable/disable nmi watchdog */ KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */ + KERN_KSTACK_DEPTH_TO_PRINT=78, /* int: # words to print in show_stack() */ }; --- 2.6.19-rc6-32smp.orig/Documentation/sysctl/kernel.txt +++ 2.6.19-rc6-32smp/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 pr ============================================================== +kstack_depth_to_print: (X86 only) + +Controls the number of words to print when dumping the raw +kernel stack. + +============================================================== + osrelease, ostype & version: # cat osrelease --- 2.6.19-rc6-32smp.orig/arch/x86_64/kernel/traps.c +++ 2.6.19-rc6-32smp/arch/x86_64/kernel/traps.c @@ -108,7 +108,7 @@ static inline void preempt_conditional_c 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 -- Chuck "Even supernovas have their duller moments." - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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