linux-kernel - Re: [PATCH v15 05/21] mm/thp: move lru_add_page_tail func to huge

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Date:   Tue, 7 Jul 2020 20:00:11 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     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,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, shakeelb@...gle.com,
        iamjoonsoo.kim@....com, richard.weiyang@...il.com,
        "Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH v15 05/21] mm/thp: move lru_add_page_tail func to
 huge_memory.c



在 2020/7/7 下午7:46, Alex Shi 写道:
>  
> +static void lru_add_page_tail(struct page *page, struct page *page_tail,
> +				struct lruvec *lruvec, struct list_head *list)
> +{
> +	VM_BUG_ON_PAGE(!PageHead(page), page);
> +	VM_BUG_ON_PAGE(PageCompound(page_tail), page);
> +	VM_BUG_ON_PAGE(PageLRU(page_tail), page);
> +	lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock);
> +
> +	if (!list)
> +		SetPageLRU(page_tail);
> +
> +	if (likely(PageLRU(page)))
> +		list_add_tail(&page_tail->lru, &page->lru);
> +	else if (list) {
> +		/* page reclaim is reclaiming a huge page */
> +		get_page(page_tail);
> +		list_add_tail(&page_tail->lru, list);
> +	} else {
> +		/*
> +		 * Head page has not yet been counted, as an hpage,
> +		 * so we must account for each subpage individually.
> +		 *
> +		 * Put page_tail on the list at the correct position
> +		 * so they all end up in order.
> +		 */
> +		add_page_to_lru_list_tail(page_tail, lruvec,
> +					  page_lru(page_tail));


I missed some points for this function, since in the call chain:
split_huge_page() to lru_add_page_tail, the head page's lru won't be
set when !PageLRU(head). But the other page_tail are add to lru list here
Is it ok for this situation?

Thanks!
Alex

> +	}
> +}