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Subject: Re: [PATCH v7 03/10] mm/lru: replace pgdat lru_lock with lruvec lock
To:     Daniel Jordan <daniel.m.jordan@oracle.com>
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From:   Alex Shi <alex.shi@linux.alibaba.com>
Message-ID: <677cb490-35a4-4186-0935-6d71305a3a3e@linux.alibaba.com>
Date:   Tue, 14 Jan 2020 14:33:58 +0800
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?? 2020/1/13 ????11:41, Daniel Jordan д??:
> 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