linux-kernel - Re: [PATCH v9 06/20] mm/thp: narrow lru locking

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Date:   Wed, 4 Mar 2020 11:02:48 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     cgroups@...r.kernel.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, tj@...nel.org, hughd@...gle.com,
        khlebnikov@...dex-team.ru, daniel.m.jordan@...cle.com,
        yang.shi@...ux.alibaba.com, willy@...radead.org,
        hannes@...xchg.org, lkp@...el.com,
        Andrea Arcangeli <aarcange@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v9 06/20] mm/thp: narrow lru locking

On Mon, Mar 02, 2020 at 07:00:16PM +0800, Alex Shi wrote:
> @@ -2564,6 +2565,9 @@ static void __split_huge_page(struct page *page, struct list_head *list,
>  		xa_lock(&swap_cache->i_pages);
>  	}
>  
> +	/* Lru list would be changed, don't care head's LRU bit. */
> +	spin_lock_irqsave(&pgdat->lru_lock, flags);
> +
>  	for (i = HPAGE_PMD_NR - 1; i >= 1; i--) {
>  		__split_huge_page_tail(head, i, lruvec, list);
>  		/* Some pages can be beyond i_size: drop them from page cache */

You change locking order WRT i_pages lock. Is it safe?

-- 
 Kirill A. Shutemov