linux-kernel - Re: [PATCH v2 10/12] mm: Remove pagevec_lookup

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Date:   Tue, 29 Sep 2020 11:08:42 +0200
From:   Jan Kara <jack@...e.cz>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Dave Chinner <dchinner@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 10/12] mm: Remove pagevec_lookup_entries

On Mon 14-09-20 14:00:40, Matthew Wilcox (Oracle) wrote:
> pagevec_lookup_entries() is now just a wrapper around find_get_entries()
> so remove it and convert all its callers.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>

Looks good. You can add:

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

								Honza

> ---
>  include/linux/pagevec.h |  3 ---
>  mm/swap.c               | 36 ++----------------------------------
>  mm/truncate.c           |  4 ++--
>  3 files changed, 4 insertions(+), 39 deletions(-)
> 
> diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h
> index ce77724a2ab7..a45bea4b4d08 100644
> --- a/include/linux/pagevec.h
> +++ b/include/linux/pagevec.h
> @@ -25,9 +25,6 @@ struct pagevec {
>  
>  void __pagevec_release(struct pagevec *pvec);
>  void __pagevec_lru_add(struct pagevec *pvec);
> -unsigned pagevec_lookup_entries(struct pagevec *pvec,
> -		struct address_space *mapping, pgoff_t start, pgoff_t end,
> -		pgoff_t *indices);
>  void pagevec_remove_exceptionals(struct pagevec *pvec);
>  unsigned pagevec_lookup_range(struct pagevec *pvec,
>  			      struct address_space *mapping,
> diff --git a/mm/swap.c b/mm/swap.c
> index 40b23300d353..cc0d648f79d4 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -1031,44 +1031,12 @@ void __pagevec_lru_add(struct pagevec *pvec)
>  	pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn, NULL);
>  }
>  
> -/**
> - * pagevec_lookup_entries - gang pagecache lookup
> - * @pvec:	Where the resulting entries are placed
> - * @mapping:	The address_space to search
> - * @start:	The starting entry index
> - * @end:	The highest index to return (inclusive).
> - * @nr_entries:	The maximum number of pages
> - * @indices:	The cache indices corresponding to the entries in @pvec
> - *
> - * pagevec_lookup_entries() will search for and return a group of up
> - * to @nr_pages pages and shadow entries in the mapping.  All
> - * entries are placed in @pvec.  pagevec_lookup_entries() takes a
> - * reference against actual pages in @pvec.
> - *
> - * The search returns a group of mapping-contiguous entries with
> - * ascending indexes.  There may be holes in the indices due to
> - * not-present entries.
> - *
> - * Only one subpage of a Transparent Huge Page is returned in one call:
> - * allowing truncate_inode_pages_range() to evict the whole THP without
> - * cycling through a pagevec of extra references.
> - *
> - * pagevec_lookup_entries() returns the number of entries which were
> - * found.
> - */
> -unsigned pagevec_lookup_entries(struct pagevec *pvec,
> -		struct address_space *mapping, pgoff_t start, pgoff_t end,
> -		pgoff_t *indices)
> -{
> -	return find_get_entries(mapping, start, end, pvec, indices);
> -}
> -
>  /**
>   * pagevec_remove_exceptionals - pagevec exceptionals pruning
>   * @pvec:	The pagevec to prune
>   *
> - * pagevec_lookup_entries() fills both pages and exceptional radix
> - * tree entries into the pagevec.  This function prunes all
> + * find_get_entries() fills both pages and XArray value entries (aka
> + * exceptional entries) into the pagevec.  This function prunes all
>   * exceptionals from @pvec without leaving holes, so that it can be
>   * passed on to page-only pagevec operations.
>   */
> diff --git a/mm/truncate.c b/mm/truncate.c
> index bbd0a02eaed7..d62aeffbffcc 100644
> --- a/mm/truncate.c
> +++ b/mm/truncate.c
> @@ -376,7 +376,7 @@ void truncate_inode_pages_range(struct address_space *mapping,
>  	index = start;
>  	for ( ; ; ) {
>  		cond_resched();
> -		if (!pagevec_lookup_entries(&pvec, mapping, index, end - 1,
> +		if (!find_get_entries(mapping, index, end - 1, &pvec,
>  				indices)) {
>  			/* If all gone from start onwards, we're done */
>  			if (index == start)
> @@ -611,7 +611,7 @@ int invalidate_inode_pages2_range(struct address_space *mapping,
>  
>  	pagevec_init(&pvec);
>  	index = start;
> -	while (pagevec_lookup_entries(&pvec, mapping, index, end, indices)) {
> +	while (find_get_entries(mapping, index, end, &pvec, indices)) {
>  		for (i = 0; i < pagevec_count(&pvec); i++) {
>  			struct page *page = pvec.pages[i];
>  
> -- 
> 2.28.0
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR