linux-kernel - Re: [PATCH v2 18/23] sys-rq: Add option to soft dump

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Message-Id: <20101108130939.13436673.randy.dunlap@oracle.com>
Date:	Mon, 8 Nov 2010 13:09:39 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mike Waychison <mikew@...gle.com>
Cc:	simon.kagstrom@...insight.net, davem@...emloft.net,
	nhorman@...driver.com, Matt Mackall <mpm@...enic.com>,
	adurbin@...gle.com, linux-kernel@...r.kernel.org,
	chavey@...gle.com, Greg KH <greg@...ah.com>,
	Américo Wang <xiyou.wangcong@...il.com>,
	akpm@...ux-foundation.org, linux-api@...r.kernel.org
Subject: Re: [PATCH v2 18/23] sys-rq: Add option to soft dump

On Mon, 08 Nov 2010 12:33:23 -0800 Mike Waychison wrote:

> It is very useful to provide some means to force the kernel logs to make it out
> via the kmsg_oops implementations on the console.  Add a new option 'Y' to
> sysrq to allow dumping of logs to kmsg_dumper drivers.
> 
> Signed-off-by: Mike Waychison <mikew@...gle.com>

Hi,

Please add 'y' to Documentation/sysrq.txt .

> ---
>  drivers/char/sysrq.c |   14 +++++++++++++-
>  1 files changed, 13 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
> index eaa5d3e..058d3c8 100644
> --- a/drivers/char/sysrq.c
> +++ b/drivers/char/sysrq.c
> @@ -41,6 +41,7 @@
>  #include <linux/oom.h>
>  #include <linux/slab.h>
>  #include <linux/input.h>
> +#include <linux/kmsg_dump.h>
>  
>  #include <asm/ptrace.h>
>  #include <asm/irq_regs.h>
> @@ -395,6 +396,17 @@ static struct sysrq_key_op sysrq_unrt_op = {
>  	.enable_mask	= SYSRQ_ENABLE_RTNICE,
>  };
>  
> +static void sysrq_handle_softdump(int key)
> +{
> +	kmsg_dump(KMSG_DUMP_SOFT, NULL);
> +}
> +static struct sysrq_key_op sysrq_softdump_op = {
> +	.handler	= sysrq_handle_softdump,
> +	.help_msg	= "soft-dump(Y)",
> +	.action_msg	= "Trigger a soft dump",
> +	.enable_mask	= SYSRQ_ENABLE_DUMP,
> +};
> +
>  /* Key Operations table and lock */
>  static DEFINE_SPINLOCK(sysrq_key_table_lock);
>  
> @@ -451,7 +463,7 @@ static struct sysrq_key_op *sysrq_key_table[36] = {
>  	/* x: May be registered on ppc/powerpc for xmon */
>  	NULL,				/* x */
>  	/* y: May be registered on sparc64 for global register dump */
> -	NULL,				/* y */
> +	&sysrq_softdump_op,		/* y */
>  	&sysrq_ftrace_dump_op,		/* z */
>  };


---
~Randy
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