linux-kernel - Re: [PATCH 2/3] filemap: pass vm

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Date:   Wed, 12 Dec 2018 11:10:51 +0100
From:   Jan Kara <jack@...e.cz>
To:     Josef Bacik <josef@...icpanda.com>
Cc:     kernel-team@...com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, tj@...nel.org, david@...morbit.com,
        akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, riel@...hat.com, jack@...e.cz
Subject: Re: [PATCH 2/3] filemap: pass vm_fault to the mmap ra helpers

On Tue 11-12-18 12:38:00, Josef Bacik wrote:
> All of the arguments to these functions come from the vmf, and the
> following patches are going to add more arguments.  Cut down on the
> amount of arguments passed by simply passing in the vmf to these two
> helpers.
> 
> Signed-off-by: Josef Bacik <josef@...icpanda.com>

The patch looks good. You can add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  mm/filemap.c | 28 ++++++++++++++--------------
>  1 file changed, 14 insertions(+), 14 deletions(-)
> 
> diff --git a/mm/filemap.c b/mm/filemap.c
> index 03bce38d8f2b..8fc45f24b201 100644
> --- a/mm/filemap.c
> +++ b/mm/filemap.c
> @@ -2309,20 +2309,20 @@ EXPORT_SYMBOL(generic_file_read_iter);
>   * Synchronous readahead happens when we don't even find
>   * a page in the page cache at all.
>   */
> -static void do_sync_mmap_readahead(struct vm_area_struct *vma,
> -				   struct file_ra_state *ra,
> -				   struct file *file,
> -				   pgoff_t offset)
> +static void do_sync_mmap_readahead(struct vm_fault *vmf)
>  {
> +	struct file *file = vmf->vma->vm_file;
> +	struct file_ra_state *ra = &file->f_ra;
>  	struct address_space *mapping = file->f_mapping;
> +	pgoff_t offset = vmf->pgoff;
>  
>  	/* If we don't want any read-ahead, don't bother */
> -	if (vma->vm_flags & VM_RAND_READ)
> +	if (vmf->vma->vm_flags & VM_RAND_READ)
>  		return;
>  	if (!ra->ra_pages)
>  		return;
>  
> -	if (vma->vm_flags & VM_SEQ_READ) {
> +	if (vmf->vma->vm_flags & VM_SEQ_READ) {
>  		page_cache_sync_readahead(mapping, ra, file, offset,
>  					  ra->ra_pages);
>  		return;
> @@ -2352,16 +2352,16 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
>   * Asynchronous readahead happens when we find the page and PG_readahead,
>   * so we want to possibly extend the readahead further..
>   */
> -static void do_async_mmap_readahead(struct vm_area_struct *vma,
> -				    struct file_ra_state *ra,
> -				    struct file *file,
> -				    struct page *page,
> -				    pgoff_t offset)
> +static void do_async_mmap_readahead(struct vm_fault *vmf,
> +				    struct page *page)
>  {
> +	struct file *file = vmf->vma->vm_file;
> +	struct file_ra_state *ra = &file->f_ra;
>  	struct address_space *mapping = file->f_mapping;
> +	pgoff_t offset = vmf->pgoff;
>  
>  	/* If we don't want any read-ahead, don't bother */
> -	if (vma->vm_flags & VM_RAND_READ)
> +	if (vmf->vma->vm_flags & VM_RAND_READ)
>  		return;
>  	if (ra->mmap_miss > 0)
>  		ra->mmap_miss--;
> @@ -2418,10 +2418,10 @@ vm_fault_t filemap_fault(struct vm_fault *vmf)
>  		 * We found the page, so try async readahead before
>  		 * waiting for the lock.
>  		 */
> -		do_async_mmap_readahead(vmf->vma, ra, file, page, offset);
> +		do_async_mmap_readahead(vmf, page);
>  	} else if (!page) {
>  		/* No page in the page cache at all */
> -		do_sync_mmap_readahead(vmf->vma, ra, file, offset);
> +		do_sync_mmap_readahead(vmf);
>  		count_vm_event(PGMAJFAULT);
>  		count_memcg_event_mm(vmf->vma->vm_mm, PGMAJFAULT);
>  		ret = VM_FAULT_MAJOR;
> -- 
> 2.14.3
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR