linux-kernel - Re: [PATCH v4 3/3] tracing: add trace event for memory-failure

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Date:	Thu, 7 May 2015 14:01:45 +0800
From:	Xie XiuQi <xiexiuqi@...wei.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	<n-horiguchi@...jp.nec.com>, <mingo@...hat.com>,
	<akpm@...ux-foundation.org>, <kirill.shutemov@...ux.intel.com>,
	<koct9i@...il.com>, <hpa@...ux.intel.com>, <hannes@...xchg.org>,
	<iamjoonsoo.kim@....com>, <luto@...capital.net>,
	<nasa4836@...il.com>, <gong.chen@...ux.intel.com>,
	<bhelgaas@...gle.com>, <bp@...e.de>, <tony.luck@...el.com>,
	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<jingle.chen@...wei.com>
Subject: Re: [PATCH v4 3/3] tracing: add trace event for memory-failure

On 2015/5/7 10:25, Steven Rostedt wrote:
> On Mon, 20 Apr 2015 16:44:40 +0800
> Xie XiuQi <xiexiuqi@...wei.com> wrote:
> 

...

>> + *
>> + * unsigned long pfn -	Page Frame Number of the corrupted page
>> + * int type	-	Page types of the corrupted page
>> + * int result	-	Result of recovery action
>> + */
>> +
>> +#ifdef CONFIG_MEMORY_FAILURE
>> +#define MF_ACTION_RESULT	\
>> +	EM ( MF_IGNORED, "Ignord" )	\
> 
>  "Ignored" ?

My fault, I'll correct it, thanks.

> 
>> +	EM ( MF_FAILED,  "Failed" )	\
>> +	EM ( MF_DELAYED, "Delayed" )	\
>> +	EMe ( MF_RECOVERED, "Recovered" )
>> +
>> +#define MF_PAGE_TYPE		\
>> +	EM ( MF_MSG_KERNEL, "reserved kernel page" )			\
>> +	EM ( MF_MSG_KERNEL_HIGH_ORDER, "high-order kernel page" )	\
...
>> +	),
>> +
>> +	TP_fast_assign(
>> +		__entry->pfn	= pfn;
>> +		__entry->type	= type;
>> +		__entry->result	= result;
>> +	),
>> +
>> +	TP_printk("pfn %#lx: recovery action for %s: %s",
> 
> Hmm, "%#" is new to me. I'm not sure libtraceevent handles that.
> 
> Not your problem, I need to make sure that it does, and if it does not,
> I need to fix it.
> 
> I'm not even sure what %# does.
> 
> Other than the typo,
> 
> Acked-by: Steven Rostedt <rostedt@...dmis.org>

Thanks,
	Xie XiuQi

> 
> -- Steve
> 
> 
>> +		__entry->pfn,
>> +		__print_symbolic(__entry->type, MF_PAGE_TYPE),
>> +		__print_symbolic(__entry->result, MF_ACTION_RESULT)
>> +	)
>> +);
>> +#endif /* CONFIG_MEMORY_FAILURE */
>>  #endif /* _TRACE_HW_EVENT_MC_H */
>>  
>>  /* This part must be outside protection */
>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>> index f074f8e..42c5981 100644
>> --- a/mm/memory-failure.c
>> +++ b/mm/memory-failure.c
>> @@ -56,6 +56,7 @@
>>  #include <linux/mm_inline.h>
>>  #include <linux/kfifo.h>
>>  #include "internal.h"
>> +#include "ras/ras_event.h"
>>  
>>  int sysctl_memory_failure_early_kill __read_mostly = 0;
>>  
>> @@ -850,6 +851,8 @@ static struct page_state {
>>  static void action_result(unsigned long pfn, enum mf_action_page_type type,
>>  			  enum mf_result result)
>>  {
>> +	trace_memory_failure_event(pfn, type, result);
>> +
>>  	pr_err("MCE %#lx: recovery action for %s: %s\n",
>>  		pfn, action_page_types[type], action_name[result]);
>>  }
> 
> 
> .
> 


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