Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Mon, 22 Apr 2019 16:09:36 -0400
From:   Jerome Glisse <jglisse@redhat.com>
To:     Laurent Dufour <ldufour@linux.ibm.com>
Cc:     akpm@linux-foundation.org, mhocko@kernel.org, peterz@infradead.org,
        kirill@shutemov.name, ak@linux.intel.com, dave@stgolabs.net,
        jack@suse.cz, Matthew Wilcox <willy@infradead.org>,
        aneesh.kumar@linux.ibm.com, benh@kernel.crashing.org,
        mpe@ellerman.id.au, paulus@samba.org,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, hpa@zytor.com,
        Will Deacon <will.deacon@arm.com>,
        Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
        sergey.senozhatsky.work@gmail.com,
        Andrea Arcangeli <aarcange@redhat.com>,
        Alexei Starovoitov <alexei.starovoitov@gmail.com>,
        kemi.wang@intel.com, Daniel Jordan <daniel.m.jordan@oracle.com>,
        David Rientjes <rientjes@google.com>,
        Ganesh Mahendran <opensource.ganesh@gmail.com>,
        Minchan Kim <minchan@kernel.org>,
        Punit Agrawal <punitagrawal@gmail.com>,
        vinayak menon <vinayakm.list@gmail.com>,
        Yang Shi <yang.shi@linux.alibaba.com>,
        zhong jiang <zhongjiang@huawei.com>,
        Haiyan Song <haiyanx.song@intel.com>,
        Balbir Singh <bsingharora@gmail.com>, sj38.park@gmail.com,
        Michel Lespinasse <walken@google.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        haren@linux.vnet.ibm.com, npiggin@gmail.com,
        paulmck@linux.vnet.ibm.com, Tim Chen <tim.c.chen@linux.intel.com>,
        linuxppc-dev@lists.ozlabs.org, x86@kernel.org
Subject: Re: [PATCH v12 14/31] mm/migrate: Pass vm_fault pointer to
 migrate_misplaced_page()
Message-ID: <20190422200936.GE14666@redhat.com>
References: <20190416134522.17540-1-ldufour@linux.ibm.com>
 <20190416134522.17540-15-ldufour@linux.ibm.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <20190416134522.17540-15-ldufour@linux.ibm.com>
User-Agent: Mutt/1.11.3 (2019-02-01)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, Apr 16, 2019 at 03:45:05PM +0200, Laurent Dufour wrote:
> migrate_misplaced_page() is only called during the page fault handling so
> it's better to pass the pointer to the struct vm_fault instead of the vma.
> 
> This way during the speculative page fault path the saved vma->vm_flags
> could be used.
> 
> Acked-by: David Rientjes <rientjes@google.com>
> Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com>

Reviewed-by: J?r?me Glisse <jglisse@redhat.com>

> ---
>  include/linux/migrate.h | 4 ++--
>  mm/memory.c             | 2 +-
>  mm/migrate.c            | 4 ++--
>  3 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/include/linux/migrate.h b/include/linux/migrate.h
> index e13d9bf2f9a5..0197e40325f8 100644
> --- a/include/linux/migrate.h
> +++ b/include/linux/migrate.h
> @@ -125,14 +125,14 @@ static inline void __ClearPageMovable(struct page *page)
>  #ifdef CONFIG_NUMA_BALANCING
>  extern bool pmd_trans_migrating(pmd_t pmd);
>  extern int migrate_misplaced_page(struct page *page,
> -				  struct vm_area_struct *vma, int node);
> +				  struct vm_fault *vmf, int node);
>  #else
>  static inline bool pmd_trans_migrating(pmd_t pmd)
>  {
>  	return false;
>  }
>  static inline int migrate_misplaced_page(struct page *page,
> -					 struct vm_area_struct *vma, int node)
> +					 struct vm_fault *vmf, int node)
>  {
>  	return -EAGAIN; /* can't migrate now */
>  }
> diff --git a/mm/memory.c b/mm/memory.c
> index d0de58464479..56802850e72c 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3747,7 +3747,7 @@ static vm_fault_t do_numa_page(struct vm_fault *vmf)
>  	}
>  
>  	/* Migrate to the requested node */
> -	migrated = migrate_misplaced_page(page, vma, target_nid);
> +	migrated = migrate_misplaced_page(page, vmf, target_nid);
>  	if (migrated) {
>  		page_nid = target_nid;
>  		flags |= TNF_MIGRATED;
> diff --git a/mm/migrate.c b/mm/migrate.c
> index a9138093a8e2..633bd9abac54 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1938,7 +1938,7 @@ bool pmd_trans_migrating(pmd_t pmd)
>   * node. Caller is expected to have an elevated reference count on
>   * the page that will be dropped by this function before returning.
>   */
> -int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
> +int migrate_misplaced_page(struct page *page, struct vm_fault *vmf,
>  			   int node)
>  {
>  	pg_data_t *pgdat = NODE_DATA(node);
> @@ -1951,7 +1951,7 @@ int migrate_misplaced_page(struct page *page, struct vm_area_struct *vma,
>  	 * with execute permissions as they are probably shared libraries.
>  	 */
>  	if (page_mapcount(page) != 1 && page_is_file_cache(page) &&
> -	    (vma->vm_flags & VM_EXEC))
> +	    (vmf->vma_flags & VM_EXEC))
>  		goto out;
>  
>  	/*
> -- 
> 2.21.0
>