linux-kernel - Re: [PATCH -v2 next 4/4] memcg: factor out stat(event)/stat_local(event

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Message-ID: <a4dd27e4-dca4-45e7-8c37-c53e88cf878c@huaweicloud.com>
Date: Thu, 16 Jan 2025 09:21:41 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
 Roman Gushchin <roman.gushchin@...ux.dev>
Cc: akpm@...ux-foundation.org, mhocko@...nel.org, hannes@...xchg.org,
 yosryahmed@...gle.com, muchun.song@...ux.dev, davidf@...eo.com,
 vbabka@...e.cz, mkoutny@...e.com, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
 chenridong@...wei.com, wangweiyang2@...wei.com
Subject: Re: [PATCH -v2 next 4/4] memcg: factor out
 stat(event)/stat_local(event_local) reading functions



On 2025/1/16 8:57, Shakeel Butt wrote:
> On Tue, Jan 14, 2025 at 06:45:20PM +0000, Roman Gushchin wrote:
>> On Tue, Jan 14, 2025 at 12:25:19PM +0000, Chen Ridong wrote:
>>> From: Chen Ridong <chenridong@...wei.com>
>>>
>>> The only difference between 'lruvec_page_state' and
>>> 'lruvec_page_state_local' is that they read 'state' and 'state_local',
>>> respectively. Factor out an inner functions to make the code more concise.
>>> Do the same for reading 'memcg_page_stat' and 'memcg_events'.
>>>
>>> Signed-off-by: Chen Ridong <chenridong@...wei.com>
>>> ---
>>>  mm/memcontrol.c | 72 +++++++++++++++++++++----------------------------
>>>  1 file changed, 30 insertions(+), 42 deletions(-)
>>>
>>> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
>>> index b10e0a8f3375..14541610cad0 100644
>>> --- a/mm/memcontrol.c
>>> +++ b/mm/memcontrol.c
>>> @@ -375,7 +375,8 @@ struct lruvec_stats {
>>>  	long state_pending[NR_MEMCG_NODE_STAT_ITEMS];
>>>  };
>>>  
>>> -unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>> +static unsigned long __lruvec_page_state(struct lruvec *lruvec,
>>> +		enum node_stat_item idx, bool local)
>>>  {
>>>  	struct mem_cgroup_per_node *pn;
>>>  	long x;
>>> @@ -389,7 +390,8 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>>  		return 0;
>>>  
>>>  	pn = container_of(lruvec, struct mem_cgroup_per_node, lruvec);
>>> -	x = READ_ONCE(pn->lruvec_stats->state[i]);
>>> +	x = local ? READ_ONCE(pn->lruvec_stats->state_local[i]) :
>>> +		    READ_ONCE(pn->lruvec_stats->state[i]);
>>>  #ifdef CONFIG_SMP
>>>  	if (x < 0)
>>>  		x = 0;
>>> @@ -397,27 +399,16 @@ unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>>  	return x;
>>>  }
>>>  
>>> +
>>> +unsigned long lruvec_page_state(struct lruvec *lruvec, enum node_stat_item idx)
>>> +{
>>> +	return __lruvec_page_state(lruvec, idx, false);
>>> +}
>>
>> I'd move these wrapper function definitions to memcontrol.h and make them
>> static inline.
> 
> +1
> 

Thank you.

Will update.

Best regards,
Ridong
>>
>> Other than that, lgtm.
>>
>> Thank you!