linux-kernel - Re: [PATCH 3/4] mm: gup: use get_user_pages_fast and get_user_pages

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Message-ID: <20141001091027.GQ4590@redhat.com>
Date:	Wed, 1 Oct 2014 11:10:27 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Cc:	Andres Lagar-Cavilla <andreslc@...gle.com>,
	Gleb Natapov <gleb@...nel.org>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	Jianyu Zhan <nasa4836@...il.com>,
	Paul Cassella <cassella@...y.com>,
	Hugh Dickins <hughd@...gle.com>,
	Peter Feiner <pfeiner@...gle.com>,
	"\\\"Dr. David Alan Gilbert\\\"" <dgilbert@...hat.com>
Subject: Re: [PATCH 3/4] mm: gup: use get_user_pages_fast and
 get_user_pages_unlocked

On Wed, Oct 01, 2014 at 10:56:36AM +0200, Andrea Arcangeli wrote:
> diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
> index f74fc0c..cd20669 100644
> --- a/drivers/misc/sgi-gru/grufault.c
> +++ b/drivers/misc/sgi-gru/grufault.c
> @@ -198,8 +198,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
>  #else
>  	*pageshift = PAGE_SHIFT;
>  #endif
> -	if (get_user_pages
> -	    (current, current->mm, vaddr, 1, write, 0, &page, NULL) <= 0)
> +	if (get_user_pages_fast(vaddr, 1, write, &page) <= 0)
>  		return -EFAULT;
>  	*paddr = page_to_phys(page);
>  	put_page(page);

> diff --git a/mm/mempolicy.c b/mm/mempolicy.c
> index 8f5330d..6606c10 100644
> --- a/mm/mempolicy.c
> +++ b/mm/mempolicy.c
> @@ -881,7 +881,7 @@ static int lookup_node(struct mm_struct *mm, unsigned long addr)
>  	struct page *p;
>  	int err;
>  
> -	err = get_user_pages(current, mm, addr & PAGE_MASK, 1, 0, 0, &p, NULL);
> +	err = get_user_pages_fast(addr & PAGE_MASK, 1, 0, &p);
>  	if (err >= 0) {
>  		err = page_to_nid(p);
>  		put_page(p);

I just noticed I need to revert the above two changes... (both weren't
exercised during the testing).
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