linux-kernel - Re: [PATCH 1/6] sched/numa, mm: make numa migrate functions to take a folio

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Date:   Wed, 20 Sep 2023 15:57:58 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     "Huang, Ying" <ying.huang@...el.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>, <willy@...radead.org>,
        <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <david@...hat.com>, Zi Yan <ziy@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>, <hughd@...gle.com>
Subject: Re: [PATCH 1/6] sched/numa, mm: make numa migrate functions to take a
 folio



On 2023/9/20 11:05, Huang, Ying wrote:
> Kefeng Wang <wangkefeng.wang@...wei.com> writes:
> 
>> The cpuid(or access time) is stored in the head page for THP, so it is
> 
> s/cpuid/cpupid/

Will fix.

> 
>> safely to make should_numa_migrate_memory() and numa_hint_fault_latency()
>> to take a folio. This is in preparation for large folio numa balancing.
>>
>> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> ---
>>   include/linux/sched/numa_balancing.h |  4 ++--
>>   kernel/sched/fair.c                  | 12 ++++++------
>>   mm/mempolicy.c                       |  3 ++-
>>   3 files changed, 10 insertions(+), 9 deletions(-)
>>
>> diff --git a/include/linux/sched/numa_balancing.h b/include/linux/sched/numa_balancing.h
>> index 3988762efe15..a38528c28665 100644
>> --- a/include/linux/sched/numa_balancing.h
>> +++ b/include/linux/sched/numa_balancing.h
>> @@ -20,7 +20,7 @@ extern void task_numa_fault(int last_node, int node, int pages, int flags);
>>   extern pid_t task_numa_group_id(struct task_struct *p);
>>   extern void set_numabalancing_state(bool enabled);
>>   extern void task_numa_free(struct task_struct *p, bool final);
>> -extern bool should_numa_migrate_memory(struct task_struct *p, struct page *page,
>> +extern bool should_numa_migrate_memory(struct task_struct *p, struct folio *folio,
>>   					int src_nid, int dst_cpu);
>>   #else
>>   static inline void task_numa_fault(int last_node, int node, int pages,
>> @@ -38,7 +38,7 @@ static inline void task_numa_free(struct task_struct *p, bool final)
>>   {
>>   }
>>   static inline bool should_numa_migrate_memory(struct task_struct *p,
>> -				struct page *page, int src_nid, int dst_cpu)
>> +				struct folio *folio, int src_nid, int dst_cpu)
>>   {
>>   	return true;
>>   }
>> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
>> index cb225921bbca..683cc1e417d7 100644
>> --- a/kernel/sched/fair.c
>> +++ b/kernel/sched/fair.c
>> @@ -1722,12 +1722,12 @@ static bool pgdat_free_space_enough(struct pglist_data *pgdat)
>>    * The smaller the hint page fault latency, the higher the possibility
>>    * for the page to be hot.
>>    */
>> -static int numa_hint_fault_latency(struct page *page)
>> +static int numa_hint_fault_latency(struct folio *folio)
>>   {
>>   	int last_time, time;
>>   
>>   	time = jiffies_to_msecs(jiffies);
>> -	last_time = xchg_page_access_time(page, time);
>> +	last_time = xchg_page_access_time(&folio->page, time);
> 
> How about define xchg_folio_access_time() and folio_cpupid_xchg_last()?
> 
Yes, like 
page_cpupid_last()/xchg_page_access_time()/page_cpupid_xchg_last(),
we could do it later to change the caller to use a folio, and rename them.


> --
> Best Regards,
> Huang, Ying
>