linux-kernel - Re: [PATCH v7 03/10] mm/lru: replace pgdat lru

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Message-ID: <20200113154116.mwly5hl5yfvjkzl2@ca-dmjordan1.us.oracle.com>
Date:   Mon, 13 Jan 2020 10:41:16 -0500
From:   Daniel Jordan <daniel.m.jordan@...cle.com>
To:     Alex Shi <alex.shi@...ux.alibaba.com>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.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,
        shakeelb@...gle.com, hannes@...xchg.org,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Chris Down <chris@...isdown.name>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, Qian Cai <cai@....pw>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
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        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v7 03/10] mm/lru: replace pgdat lru_lock with lruvec lock

Hi Alex,

On Wed, Dec 25, 2019 at 05:04:19PM +0800, Alex Shi wrote:
> @@ -900,6 +904,29 @@ static inline struct lruvec *mem_cgroup_page_lruvec(struct page *page,
>  {
>  	return &pgdat->__lruvec;
>  }
> +#define lock_page_lruvec_irq(page)			\
> +({							\
> +	struct pglist_data *pgdat = page_pgdat(page);	\
> +	spin_lock_irq(&pgdat->__lruvec.lru_lock);	\
> +	&pgdat->__lruvec;				\
> +})
> +
> +#define lock_page_lruvec_irqsave(page, flagsp)			\
> +({								\
> +	struct pglist_data *pgdat = page_pgdat(page);		\
> +	spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp);	\
> +	&pgdat->__lruvec;					\
> +})
> +
> +#define unlock_page_lruvec_irq(lruvec)			\
> +({							\
> +	spin_unlock_irq(&lruvec->lru_lock);		\
> +})
> +
> +#define unlock_page_lruvec_irqrestore(lruvec, flags)		\
> +({								\
> +	spin_unlock_irqrestore(&lruvec->lru_lock, flags);	\
> +})

Noticed this while testing your series.  These are safe as inline functions, so
I think you may have gotten the wrong impression when Johannes made this point:

https://lore.kernel.org/linux-mm/20191119164448.GA396644@cmpxchg.org/