Re: [RFC PATCH v4 4/6] mm: Add page table level flags to vm_flags

[Steven Rostedt]

On Tue, 24 Mar 2020 21:45:32 +0800
Zhenyu Ye <yezhenyu2@xxxxxxxxxx> wrote:

> --- a/include/trace/events/mmflags.h
> +++ b/include/trace/events/mmflags.h
> @@ -130,6 +130,16 @@ IF_HAVE_PG_IDLE(PG_idle,		"idle"		)
>  #define IF_HAVE_VM_SOFTDIRTY(flag,name)
>  #endif
>  
> +#ifdef CONFIG_64BIT
> +#define IF_HAVE_VM_LEVEL_PUD(flag,name)	{flag, name}
> +#define IF_HAVE_VM_LEVEL_PMD(flag,name)	{flag, name}
> +#define IF_HAVE_VM_LEVEL_PTE(flag,name)	{flag, name}
> +#else
> +#define IF_HAVE_VM_LEVEL_PUD(flag,name)
> +#define IF_HAVE_VM_LEVEL_PMD(flag,name)
> +#define IF_HAVE_VM_LEVEL_PTE(flag,name)
> +#endif
> +
>  #define __def_vmaflag_names						\
>  	{VM_READ,			"read"		},		\
>  	{VM_WRITE,			"write"		},		\
> @@ -161,7 +171,10 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY,	"softdirty"	)		\
>  	{VM_MIXEDMAP,			"mixedmap"	},		\
>  	{VM_HUGEPAGE,			"hugepage"	},		\
>  	{VM_NOHUGEPAGE,			"nohugepage"	},		\
> -	{VM_MERGEABLE,			"mergeable"	}		\
> +	{VM_MERGEABLE,			"mergeable"	},		\
> +IF_HAVE_VM_LEVEL_PUD(VM_LEVEL_PUD,	"pud-level"	),		\
> +IF_HAVE_VM_LEVEL_PMD(VM_LEVEL_PMD,	"pmd-level"	),		\
> +IF_HAVE_VM_LEVEL_PTE(VM_LEVEL_PTE,	"pte-level"	)		\
>  

Have you tested this on 32bit? It looks like you'll get empty commas there.
Perhaps the defines need to be:

#ifdef CONFIG_64BIT
#define IF_HAVE_VM_LEVEL_PUD(flag,name)	{flag, name},
#define IF_HAVE_VM_LEVEL_PMD(flag,name)	{flag, name},
#define IF_HAVE_VM_LEVEL_PTE(flag,name)	{flag, name}
#else
#define IF_HAVE_VM_LEVEL_PUD(flag,name)
#define IF_HAVE_VM_LEVEL_PMD(flag,name)
#define IF_HAVE_VM_LEVEL_PTE(flag,name)
#endif

And leave out the commas in the list.

-- Steve