linux-kernel - Re: [PATCH 2/5] mm/vmscan: remove misleading setting to sc->priority

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Date:   Mon, 12 Jul 2021 09:24:25 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Miaohe Lin <linmiaohe@...wei.com>
Cc:     akpm@...ux-foundation.org, hannes@...xchg.org, vbabka@...e.cz,
        axboe@...nel.dk, iamjoonsoo.kim@....com, alexs@...nel.org,
        apopple@...dia.com, willy@...radead.org, minchan@...nel.org,
        david@...hat.com, shli@...com, hillf.zj@...baba-inc.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] mm/vmscan: remove misleading setting to sc->priority

On Sat 10-07-21 18:03:26, Miaohe Lin wrote:
> The priority field of sc is used to control how many pages we should scan
> at once while we always traverse the list to shrink the pages in these
> functions. So these settings are unneeded and misleading.

I dunno. I agree that priority is not really used as these operate on
page lists but I am not sure this is worth touching.

> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> ---
>  mm/vmscan.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 6483fe0e2065..fbe53e60b248 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1702,7 +1702,6 @@ unsigned int reclaim_clean_pages_from_list(struct zone *zone,
>  {
>  	struct scan_control sc = {
>  		.gfp_mask = GFP_KERNEL,
> -		.priority = DEF_PRIORITY,
>  		.may_unmap = 1,
>  	};
>  	struct reclaim_stat stat;
> @@ -2327,7 +2326,6 @@ unsigned long reclaim_pages(struct list_head *page_list)
>  	unsigned int noreclaim_flag;
>  	struct scan_control sc = {
>  		.gfp_mask = GFP_KERNEL,
> -		.priority = DEF_PRIORITY,
>  		.may_writepage = 1,
>  		.may_unmap = 1,
>  		.may_swap = 1,
> -- 
> 2.23.0

-- 
Michal Hocko
SUSE Labs