linux-kernel - Re: [PATCH 3/3] f2fs: enhance scalability of trace macro

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Date:   Thu, 4 May 2017 09:19:58 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, Chao Yu <chao@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] f2fs: enhance scalability of trace macro

Hi Jaegeuk,

On 2017/5/4 2:47, Jaegeuk Kim wrote:
> Hi Chao,
> 
> On 05/03, Chao Yu wrote:
>> From: Chao Yu <yuchao0@...wei.com>
>>
>> Use __print_flags in show_bio_op_flags and show_cpreason instead of
>> __print_symbolic, it enables tracer function traverses and shows all
>> bits in the flag.
>>
>> Additionally, add missing REQ_FUA into F2FS_OP_FLAGS.
>>
>> Signed-off-by: Chao Yu <yuchao0@...wei.com>
>> ---
>>  include/trace/events/f2fs.h | 29 ++++++++++++++---------------
>>  1 file changed, 14 insertions(+), 15 deletions(-)
>>
>> diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
>> index c78a223a0d9c..ad4cbeeeef44 100644
>> --- a/include/trace/events/f2fs.h
>> +++ b/include/trace/events/f2fs.h
>> @@ -59,8 +59,8 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
>>  		{ IPU,		"IN-PLACE" },				\
>>  		{ OPU,		"OUT-OF-PLACE" })
>>  
>> -#define F2FS_OP_FLAGS (REQ_RAHEAD | REQ_SYNC | REQ_PREFLUSH | REQ_META |\
>> -			REQ_PRIO)
>> +#define F2FS_OP_FLAGS (REQ_RAHEAD | REQ_SYNC | REQ_META | REQ_PRIO |	\
>> +			REQ_PREFLUSH | REQ_FUA)
>>  #define F2FS_BIO_FLAG_MASK(t)	(t & F2FS_OP_FLAGS)
>>  
>>  #define show_bio_type(op,op_flags)	show_bio_op(op),		\
>> @@ -79,15 +79,13 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
>>  		{ REQ_OP_WRITE_ZEROES,		"WRITE_ZEROES" })
>>  
>>  #define show_bio_op_flags(flags)					\
>> -	__print_symbolic(F2FS_BIO_FLAG_MASK(flags),			\
>> -		{ REQ_RAHEAD, 		"(RA)" },			\
>> -		{ REQ_SYNC, 		"(S)" },			\
>> -		{ REQ_SYNC | REQ_PRIO,	"(SP)" },			\
>> -		{ REQ_META, 		"(M)" },			\
>> -		{ REQ_META | REQ_PRIO,	"(MP)" },			\
>> -		{ REQ_SYNC | REQ_PREFLUSH , "(SF)" },			\
>> -		{ REQ_SYNC | REQ_META | REQ_PRIO, "(SMP)" },		\
>> -		{ REQ_PREFLUSH | REQ_META | REQ_PRIO, "(FMP)" },	\
>> +	__print_flags(F2FS_BIO_FLAG_MASK(flags), "|",			\
>> +		{ REQ_RAHEAD,		"R" },				\
>> +		{ REQ_SYNC,		"S" },				\
>> +		{ REQ_META,		"M" },				\
>> +		{ REQ_PRIO,		"P" },				\
>> +		{ REQ_PREFLUSH,		"PF" },				\
>> +		{ REQ_FUA,		"FUA" },			\
>>  		{ 0, " \b" })
> 
> We don't need the above last entry.

Agreed.

> 
>>  
>>  #define show_data_type(type)						\
>> @@ -121,13 +119,14 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
>>  		{ GC_CB,	"Cost-Benefit" })
>>  
>>  #define show_cpreason(type)						\
>> -	__print_symbolic(type,						\
>> +	__print_flags(type, "|",					\
>>  		{ CP_UMOUNT,	"Umount" },				\
>>  		{ CP_FASTBOOT,	"Fastboot" },				\
>>  		{ CP_SYNC,	"Sync" },				\
>>  		{ CP_RECOVERY,	"Recovery" },				\
>>  		{ CP_DISCARD,	"Discard" },				\
>> -		{ CP_UMOUNT | CP_TRIMMED,	"Umount,Trimmed" })
>> +		{ CP_UMOUNT,	"Umount" },				\
>> +		{ CP_TRIMMED,	"Trimmed" })
>>  
>>  struct victim_sel_policy;
>>  struct f2fs_map_blocks;
>> @@ -774,7 +773,7 @@ DECLARE_EVENT_CLASS(f2fs__submit_page_bio,
>>  	),
>>  
>>  	TP_printk("dev = (%d,%d), ino = %lu, page_index = 0x%lx, "
>> -		"oldaddr = 0x%llx, newaddr = 0x%llx, rw = %s%s, type = %s",
>> +		"oldaddr = 0x%llx, newaddr = 0x%llx, rw = %s,%s, type = %s",
> 
> How about showing this like %s(%s) ?

OK, let do the change in next version.

thanks,

> 
>>  		show_dev_ino(__entry),
>>  		(unsigned long)__entry->index,
>>  		(unsigned long long)__entry->old_blkaddr,
>> @@ -827,7 +826,7 @@ DECLARE_EVENT_CLASS(f2fs__bio,
>>  		__entry->size		= bio->bi_iter.bi_size;
>>  	),
>>  
>> -	TP_printk("dev = (%d,%d)/(%d,%d), rw = %s%s, %s, sector = %lld, size = %u",
>> +	TP_printk("dev = (%d,%d)/(%d,%d), rw = %s,%s, %s, sector = %lld, size = %u",
> 
> ditto.
> 
> Thanks,
> 
>>  		show_dev(__entry->target),
>>  		show_dev(__entry->dev),
>>  		show_bio_type(__entry->op, __entry->op_flags),
>> -- 
>> 2.12.2.575.gb14f27f
> 
> .
>