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

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Date:   Tue, 14 Jan 2020 14:33:58 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.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, 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>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        swkhack <swkhack@...il.com>,
        "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Colin Ian King <colin.king@...onical.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Nikolay Borisov <nborisov@...e.com>,
        Ira Weiny <ira.weiny@...el.com>,
        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



在 2020/1/13 下午11:41, Daniel Jordan 写道:
> 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/
> 

Thanks for reminder! Daniel!

I write them to macro, since I guess it's more favorite for some guys. It's do a bit more neat than function although cost a bit readablity. 

Thanks a lot! :)
Alex