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Commit 0741f4d2 authored by Chuck Ebbert's avatar Chuck Ebbert Committed by Andi Kleen
Browse files

[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: default avatarChuck Ebbert <76306.1226@compuserve.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent c7a3392e

Documentation/sysctl/kernel.txt

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/i386/kernel/traps.c

+1 −1
Original line number Diff line number Diff line
@@ -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

arch/x86_64/kernel/traps.c

+1 −1
Original line number Diff line number Diff line
@@ -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

include/asm-x86_64/stacktrace.h

+2 −0
Original line number Diff line number Diff line 
#ifndef _ASM_STACKTRACE_H

#define _ASM_STACKTRACE_H 1



extern int kstack_depth_to_print;



/* Generic stack tracer with callbacks */



struct stacktrace_ops {

kernel/sysctl.c

+9 −0
Original line number Diff line number Diff line
@@ -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)

	{