linux-kernel - Re: [PATCH v21 13/19] mm/mlock: remove __munlock_isolate_lru

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Date:   Wed, 11 Nov 2020 14:07:16 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Alex Shi <alex.shi@...ux.alibaba.com>, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, tj@...nel.org, hughd@...gle.com,
        khlebnikov@...dex-team.ru, daniel.m.jordan@...cle.com,
        willy@...radead.org, hannes@...xchg.org, lkp@...el.com,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, shakeelb@...gle.com,
        iamjoonsoo.kim@....com, richard.weiyang@...il.com,
        kirill@...temov.name, alexander.duyck@...il.com,
        rong.a.chen@...el.com, mhocko@...e.com, vdavydov.dev@...il.com,
        shy828301@...il.com
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v21 13/19] mm/mlock: remove __munlock_isolate_lru_page

On 11/5/20 9:55 AM, Alex Shi wrote:
> The func only has one caller, remove it to clean up code and simplify
> code.
> 
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> Acked-by: Hugh Dickins <hughd@...gle.com>
> Acked-by: Johannes Weiner <hannes@...xchg.org>
> Cc: Hugh Dickins <hughd@...gle.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Vlastimil Babka <vbabka@...e.cz>

Nit below:

> ---
>   mm/mlock.c | 31 +++++++++----------------------
>   1 file changed, 9 insertions(+), 22 deletions(-)
> 
> diff --git a/mm/mlock.c b/mm/mlock.c
> index 796c726a0407..d487aa864e86 100644
> --- a/mm/mlock.c
> +++ b/mm/mlock.c
> @@ -106,26 +106,6 @@ void mlock_vma_page(struct page *page)
>   }
>   
>   /*
> - * Isolate a page from LRU with optional get_page() pin.
> - * Assumes lru_lock already held and page already pinned.
> - */
> -static bool __munlock_isolate_lru_page(struct page *page, bool getpage)
> -{
> -	if (PageLRU(page)) {
> -		struct lruvec *lruvec;
> -
> -		lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
> -		if (getpage)
> -			get_page(page);
> -		ClearPageLRU(page);
> -		del_page_from_lru_list(page, lruvec, page_lru(page));
> -		return true;
> -	}
> -
> -	return false;
> -}
> -
> -/*
>    * Finish munlock after successful page isolation
>    *
>    * Page must be locked. This is a wrapper for try_to_munlock()
> @@ -296,9 +276,16 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
>   			 * We already have pin from follow_page_mask()
>   			 * so we can spare the get_page() here.
>   			 */
> -			if (__munlock_isolate_lru_page(page, false))
> +			if (PageLRU(page)) {
> +				struct lruvec *lruvec;
> +
> +				ClearPageLRU(page);
> +				lruvec = mem_cgroup_page_lruvec(page,
> +							page_pgdat(page));
> +				del_page_from_lru_list(page, lruvec,
> +							page_lru(page));
>   				continue;
> -			else
> +			} else
>   				__munlock_isolation_failed(page);

IIRC coding styles says that once the if () part uses brackets, the else part 
should too, even if it's single line.

>   		} else {
>   			delta_munlocked++;
>