linux-kernel - Re: [PATCH v20 04/20] mm/thp: use head for head page in lru_add_page

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Message-ID: <374a5d13-e5d2-9f5e-0185-5b0f2a613fa6@linux.alibaba.com>
Date:   Tue, 3 Nov 2020 10:43:07 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Johannes Weiner <hannes@...xchg.org>, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, tj@...nel.org, hughd@...gle.com,
        khlebnikov@...dex-team.ru, daniel.m.jordan@...cle.com,
        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
Subject: Re: [PATCH v20 04/20] mm/thp: use head for head page in
 lru_add_page_tail



在 2020/11/3 上午12:03, Matthew Wilcox 写道:
> On Fri, Oct 30, 2020 at 10:46:54AM +0800, Alex Shi wrote:
>> -static void lru_add_page_tail(struct page *page, struct page *page_tail,
>> +static void lru_add_page_tail(struct page *head, struct 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);
>> +	VM_BUG_ON_PAGE(!PageHead(head), head);
>> +	VM_BUG_ON_PAGE(PageCompound(tail), head);
>> +	VM_BUG_ON_PAGE(PageLRU(tail), head);
> 
> These last two should surely have been
> 	VM_BUG_ON_PAGE(PageCompound(tail), tail);
> 	VM_BUG_ON_PAGE(PageLRU(tail), tail);
> 
> Also, what do people think about converting these to VM_BUG_ON_PGFLAGS?

Hi Matthew,

Thanks for reminder! Looks these changes worth for another patch.

> 
> Either way:
> 
> Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> 


I will take this option this time. :)

Thanks!
Alex