linux-kernel - Re: [PATCH] hugetlb: restrict hugepage_migration_support() to x86

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Date:	Thu, 29 May 2014 18:52:11 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Michael Ellerman <mpe@...erman.id.au>
cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	benh@...nel.crashing.org, Tony Luck <tony.luck@...el.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	trinity@...r.kernel.org
Subject: Re: [PATCH] hugetlb: restrict hugepage_migration_support() to x86_64
 (Re: BUG at mm/memory.c:1489!)

On Fri, 30 May 2014, Michael Ellerman wrote:
> 
> diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
> index 3c1b968..f230a97 100644
> --- a/include/linux/mempolicy.h
> +++ b/include/linux/mempolicy.h
> @@ -175,6 +175,12 @@ static inline int vma_migratable(struct vm_area_struct *vma)
>  {
>         if (vma->vm_flags & (VM_IO | VM_PFNMAP))
>                 return 0;
> +
> +#ifndef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION
> +       if (vma->vm_flags & VM_HUGETLB)
> +               return 0;
> +#endif
> +
>         /*
>          * Migration allocates pages in the highest zone. If we cannot
>          * do so then migration (at least from node to node) is not

That's right, thanks.

> 
> 
> Which seems to be what Hugh was referring to in his mail - correct me if I'm
> wrong Hugh.
> 
> With your patch and the above hunk I can run trinity happily for a while,
> whereas without it crashes almost immediately.
> 
> So with the above hunk you can add my tested-by.
> 
> cheers
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