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From: Alex Shi <alex.shi@linux.alibaba.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] mm/vmstat: don't do count if no needs
Date: Tue, 21 Jul 2020 11:07:48 +0800	[thread overview]
Message-ID: <757accf7-81bf-442c-f144-4cad52fea4a5@linux.alibaba.com> (raw)
In-Reply-To: <20200720161404.bd0c24560114bf48d6acbaff@linux-foundation.org>



在 2020/7/21 上午7:14, Andrew Morton 写道:
>> --- a/mm/vmstat.c
>> +++ b/mm/vmstat.c
>> @@ -321,6 +321,9 @@ void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
>>  	long x;
>>  	long t;
>>  
>> +	if (unlikely(!delta))
>> +		return;
>> +
> Do we know that delta==0 is frequent enough to make the change a net
> benefit?

Uh,I check again. it seems no much place delta==0, forget this patch.

Thanks
Alex


      reply	other threads:[~2020-07-21  3:07 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20  5:23 Alex Shi
2020-07-20  5:42 ` Alex Shi
2020-07-20 23:14   ` Andrew Morton
2020-07-21  3:07     ` Alex Shi [this message]

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