linux-kernel - Re: [PATCH v2 6/9] mm, debug: introduce dump_gfpflag_names() for symbolic printing of gfp

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Message-Id: <DE6F06A1-8E6E-474F-9CDF-E267955BA0A9@gmail.com>
Date:	Fri, 27 Nov 2015 11:40:40 +0800
From:	yalin wang <yalin.wang2010@...il.com>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH v2 6/9] mm, debug: introduce dump_gfpflag_names() for symbolic printing of gfp_flags


> On Nov 25, 2015, at 18:28, Vlastimil Babka <vbabka@...e.cz> wrote:
> 
> On 11/25/2015 09:16 AM, Joonsoo Kim wrote:
>> On Tue, Nov 24, 2015 at 01:36:18PM +0100, Vlastimil Babka wrote:
>>> --- a/include/trace/events/gfpflags.h
>>> +++ b/include/trace/events/gfpflags.h
>>> @@ -8,8 +8,8 @@
>>>  *
>>>  * Thus most bits set go first.
>>>  */
>>> -#define show_gfp_flags(flags)						\
>>> -	(flags) ? __print_flags(flags, "|",				\
>>> +
>>> +#define __def_gfpflag_names						\
>>> 	{(unsigned long)GFP_TRANSHUGE,		"GFP_TRANSHUGE"},	\
>>> 	{(unsigned long)GFP_HIGHUSER_MOVABLE,	"GFP_HIGHUSER_MOVABLE"}, \
>>> 	{(unsigned long)GFP_HIGHUSER,		"GFP_HIGHUSER"},	\
>>> @@ -19,9 +19,13 @@
>>> 	{(unsigned long)GFP_NOFS,		"GFP_NOFS"},		\
>>> 	{(unsigned long)GFP_ATOMIC,		"GFP_ATOMIC"},		\
>>> 	{(unsigned long)GFP_NOIO,		"GFP_NOIO"},		\
>>> +	{(unsigned long)GFP_NOWAIT,		"GFP_NOWAIT"},		\
>>> +	{(unsigned long)__GFP_DMA,		"GFP_DMA"},		\
>>> +	{(unsigned long)__GFP_DMA32,		"GFP_DMA32"},		\
>>> 	{(unsigned long)__GFP_HIGH,		"GFP_HIGH"},		\
>>> 	{(unsigned long)__GFP_ATOMIC,		"GFP_ATOMIC"},		\
>>> 	{(unsigned long)__GFP_IO,		"GFP_IO"},		\
>>> +	{(unsigned long)__GFP_FS,		"GFP_FS"},		\
>>> 	{(unsigned long)__GFP_COLD,		"GFP_COLD"},		\
>>> 	{(unsigned long)__GFP_NOWARN,		"GFP_NOWARN"},		\
>>> 	{(unsigned long)__GFP_REPEAT,		"GFP_REPEAT"},		\
>>> @@ -36,8 +40,12 @@
>>> 	{(unsigned long)__GFP_RECLAIMABLE,	"GFP_RECLAIMABLE"},	\
>>> 	{(unsigned long)__GFP_MOVABLE,		"GFP_MOVABLE"},		\
>>> 	{(unsigned long)__GFP_NOTRACK,		"GFP_NOTRACK"},		\
>>> +	{(unsigned long)__GFP_WRITE,		"GFP_WRITE"},		\
>>> 	{(unsigned long)__GFP_DIRECT_RECLAIM,	"GFP_DIRECT_RECLAIM"},	\
>>> 	{(unsigned long)__GFP_KSWAPD_RECLAIM,	"GFP_KSWAPD_RECLAIM"},	\
>>> 	{(unsigned long)__GFP_OTHER_NODE,	"GFP_OTHER_NODE"}	\
>>> -	) : "GFP_NOWAIT"
>>> 
>>> +#define show_gfp_flags(flags)						\
>>> +	(flags) ? __print_flags(flags, "|",				\
>>> +	__def_gfpflag_names						\
>>> +	) : "none"
>> 
>> How about moving this to gfp.h or something?
>> Now, we use it in out of tracepoints so there is no need to keep it
>> in include/trace/events/xxx.
> 
> Hm I didn't want to pollute such widely included header with such defines. And
> show_gfp_flags shouldn't be there definitely as it depends on __print_flags.
> What do others think?
how about add this into standard printk()  format ?
like cpu mask print in printk use %*pb[l]  ,
it define a macro cpumask_pr_args  to print cpumask .

we can also define a new format like %pG  means print flag ,
then it will be useful for other code to use , like dump vma /  mm  flags ..

Thanks





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