linux-kernel - Re: [PATCH 03/16] mm/migration: remove unneeded local variable page

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Date:   Mon, 07 Mar 2022 21:58:11 +1100
From:   Alistair Popple <apopple@...dia.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, mike.kravetz@...cle.com,
        shy828301@...il.com, willy@...radead.org, ying.huang@...el.com,
        ziy@...dia.com, minchan@...nel.org, ave.hansen@...ux.intel.com,
        o451686892@...il.com, almasrymina@...gle.com, jhubbard@...dia.com,
        rcampbell@...dia.com, peterx@...hat.com, naoya.horiguchi@....com,
        mhocko@...e.com, riel@...hat.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/16] mm/migration: remove unneeded local variable
 page_lru

Miaohe Lin <linmiaohe@...wei.com> writes:

> We can use page_is_file_lru() directly to help account the isolated
> pages to simplify the code a bit as same as local variable follflags.

Looks good, but there are two independent changes here. Even though they are
small they should probably be split into two patches.

> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/migrate.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/mm/migrate.c b/mm/migrate.c
> index bc1867a5706c..da5a81052468 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -1609,7 +1609,6 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
>  {
>  	struct vm_area_struct *vma;
>  	struct page *page;
> -	unsigned int follflags;
>  	int err;
>
>  	mmap_read_lock(mm);
> @@ -1619,8 +1618,7 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
>  		goto out;
>
>  	/* FOLL_DUMP to ignore special (like zero) pages */
> -	follflags = FOLL_GET | FOLL_DUMP;
> -	page = follow_page(vma, addr, follflags);
> +	page = follow_page(vma, addr, FOLL_GET | FOLL_DUMP);
>
>  	err = PTR_ERR(page);
>  	if (IS_ERR(page))
> @@ -2033,7 +2031,6 @@ static struct page *alloc_misplaced_dst_page_thp(struct page *page,
>
>  static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
>  {
> -	int page_lru;
>  	int nr_pages = thp_nr_pages(page);
>  	int order = compound_order(page);
>
> @@ -2060,8 +2057,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
>  	if (isolate_lru_page(page))
>  		return 0;
>
> -	page_lru = page_is_file_lru(page);
> -	mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru,
> +	mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_is_file_lru(page),
>  			    nr_pages);
>
>  	/*