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Commit 69f698ad authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

ftrace: sysrq-z to dump the buffers 



Impact: add SysRq-z support to dump trace buffers

Allows one to force an ftrace dump from sysrq

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: default avatarSteven Rostedt <srostedt@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent b2a866f9

drivers/char/sysrq.c

+17 −1
Original line number Diff line number Diff line
@@ -274,6 +274,22 @@ static struct sysrq_key_op sysrq_showstate_blocked_op = { 
	.enable_mask	= SYSRQ_ENABLE_DUMP,

};



#ifdef CONFIG_TRACING

#include <linux/ftrace.h>



static void sysrq_ftrace_dump(int key, struct tty_struct *tty)

{

	ftrace_dump();

}

static struct sysrq_key_op sysrq_ftrace_dump_op = {

	.handler	= sysrq_ftrace_dump,

	.help_msg	= "dumpZ-ftrace-buffer",

	.action_msg	= "Dump ftrace buffer",

	.enable_mask	= SYSRQ_ENABLE_DUMP,

};

#else

#define sysrq_ftrace_dump_op (*(struct sysrq_key_op *)0)

#endif



static void sysrq_handle_showmem(int key, struct tty_struct *tty)

{
@@ -406,7 +422,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = { 
	NULL,				/* x */

	/* y: May be registered on sparc64 for global register dump */

	NULL,				/* y */

	NULL				/* z */

	&sysrq_ftrace_dump_op,		/* z */

};



/* key2index calculation, -1 on invalid index */