linux-kernel - Re: [RFC PATCHv2 1/2] Add mm flag to control THP

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Date:	Sun, 19 Jan 2014 01:41:34 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Alex Thorlton <athorlton@....com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Rik van Riel <riel@...hat.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Oleg Nesterov <oleg@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andy Lutomirski <luto@...capital.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Kees Cook <keescook@...omium.org>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC PATCHv2 1/2] Add mm flag to control THP

On Thu, Jan 16, 2014 at 03:01:43PM -0600, Alex Thorlton wrote:
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 91672e2..475f59f 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -1,6 +1,8 @@
>  #ifndef _LINUX_HUGE_MM_H
>  #define _LINUX_HUGE_MM_H
>  
> +#include <linux/sched.h>
> +

Hm, now <linux/mm.h> depends on <linux/sched.h>. It doesn't look as a good
idea.

Why do we have MMF_* defines in <linux/sched.h>?
Wouldn't it more appropriate to put them in <linux/mm_types.h>?

>  extern int do_huge_pmd_anonymous_page(struct mm_struct *mm,
>  				      struct vm_area_struct *vma,
>  				      unsigned long address, pmd_t *pmd,
> @@ -74,7 +76,8 @@ extern bool is_vma_temporary_stack(struct vm_area_struct *vma);
>  	   (1<<TRANSPARENT_HUGEPAGE_REQ_MADV_FLAG) &&			\
>  	   ((__vma)->vm_flags & VM_HUGEPAGE))) &&			\
>  	 !((__vma)->vm_flags & VM_NOHUGEPAGE) &&			\
> -	 !is_vma_temporary_stack(__vma))
> +	 !is_vma_temporary_stack(__vma) &&				\
> +	 !test_bit(MMF_THP_DISABLE, &(__vma)->vm_mm->flags))
>  #define transparent_hugepage_defrag(__vma)				\
>  	((transparent_hugepage_flags &					\
>  	  (1<<TRANSPARENT_HUGEPAGE_DEFRAG_FLAG)) ||			\
> @@ -227,7 +230,6 @@ static inline int do_huge_pmd_numa_page(struct mm_struct *mm, struct vm_area_str
>  {
>  	return 0;
>  }
> -
>  #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
>  
>  #endif /* _LINUX_HUGE_MM_H */

Why?

-- 
 Kirill A. Shutemov
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