linux-kernel - Re: [PATCH] mm/vmstat: don't do count if no needs

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



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