linux-kernel - Re: [PATCH v5 6/6] mm: shmem: add mTHP counters for anonymous shmem

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Date: Thu, 13 Jun 2024 09:00:48 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Kefeng Wang <wangkefeng.wang@...wei.com>, akpm@...ux-foundation.org,
 hughd@...gle.com
Cc: willy@...radead.org, david@...hat.com, ying.huang@...el.com,
 21cnbao@...il.com, ryan.roberts@....com, shy828301@...il.com,
 ziy@...dia.com, ioworker0@...il.com, da.gomez@...sung.com,
 p.raghav@...sung.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 6/6] mm: shmem: add mTHP counters for anonymous shmem



On 2024/6/12 21:46, Kefeng Wang wrote:
> 
> 
> On 2024/6/11 18:11, Baolin Wang wrote:
>> Add mTHP counters for anonymous shmem.
>>
>> Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
>> ---
>>   include/linux/huge_mm.h |  3 +++
>>   mm/huge_memory.c        |  6 ++++++
>>   mm/shmem.c              | 18 +++++++++++++++---
>>   3 files changed, 24 insertions(+), 3 deletions(-)
>>
>> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
>> index 909cfc67521d..212cca384d7e 100644
>> --- a/include/linux/huge_mm.h
>> +++ b/include/linux/huge_mm.h
>> @@ -281,6 +281,9 @@ enum mthp_stat_item {
>>       MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE,
>>       MTHP_STAT_SWPOUT,
>>       MTHP_STAT_SWPOUT_FALLBACK,
>> +    MTHP_STAT_FILE_ALLOC,
>> +    MTHP_STAT_FILE_FALLBACK,
>> +    MTHP_STAT_FILE_FALLBACK_CHARGE,
>>       __MTHP_STAT_COUNT
>>   };
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index 1360a1903b66..3fbcd77f5957 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -555,6 +555,9 @@ DEFINE_MTHP_STAT_ATTR(anon_fault_fallback, 
>> MTHP_STAT_ANON_FAULT_FALLBACK);
>>   DEFINE_MTHP_STAT_ATTR(anon_fault_fallback_charge, 
>> MTHP_STAT_ANON_FAULT_FALLBACK_CHARGE);
>>   DEFINE_MTHP_STAT_ATTR(swpout, MTHP_STAT_SWPOUT);
>>   DEFINE_MTHP_STAT_ATTR(swpout_fallback, MTHP_STAT_SWPOUT_FALLBACK);
>> +DEFINE_MTHP_STAT_ATTR(file_alloc, MTHP_STAT_FILE_ALLOC);
>> +DEFINE_MTHP_STAT_ATTR(file_fallback, MTHP_STAT_FILE_FALLBACK);
>> +DEFINE_MTHP_STAT_ATTR(file_fallback_charge, 
>> MTHP_STAT_FILE_FALLBACK_CHARGE);
>>   static struct attribute *stats_attrs[] = {
>>       &anon_fault_alloc_attr.attr,
>> @@ -562,6 +565,9 @@ static struct attribute *stats_attrs[] = {
>>       &anon_fault_fallback_charge_attr.attr,
>>       &swpout_attr.attr,
>>       &swpout_fallback_attr.attr,
>> +    &file_alloc_attr.attr,
>> +    &file_fallback_attr.attr,
>> +    &file_fallback_charge_attr.attr,
>>       NULL,
>>   };
>> diff --git a/mm/shmem.c b/mm/shmem.c
>> index f5469c357be6..99bd3c34f0fb 100644
>> --- a/mm/shmem.c
>> +++ b/mm/shmem.c
>> @@ -1773,6 +1773,9 @@ static struct folio 
>> *shmem_alloc_and_add_folio(struct vm_fault *vmf,
>>               if (pages == HPAGE_PMD_NR)
>>                   count_vm_event(THP_FILE_FALLBACK);
>> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> +            count_mthp_stat(order, MTHP_STAT_FILE_FALLBACK);
>> +#endif
>>               order = next_order(&suitable_orders, order);
>>           }
>>       } else {
>> @@ -1792,9 +1795,15 @@ static struct folio 
>> *shmem_alloc_and_add_folio(struct vm_fault *vmf,
>>           if (xa_find(&mapping->i_pages, &index,
>>                   index + pages - 1, XA_PRESENT)) {
>>               error = -EEXIST;
>> -        } else if (pages == HPAGE_PMD_NR) {
>> -            count_vm_event(THP_FILE_FALLBACK);
>> -            count_vm_event(THP_FILE_FALLBACK_CHARGE);
>> +        } else if (pages > 1) {
>> +            if (pages == HPAGE_PMD_NR) {
>> +                count_vm_event(THP_FILE_FALLBACK);
>> +                count_vm_event(THP_FILE_FALLBACK_CHARGE);
>> +            }
>> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
>> +            count_mthp_stat(folio_order(folio), 
>> MTHP_STAT_FILE_FALLBACK);
>> +            count_mthp_stat(folio_order(folio), 
>> MTHP_STAT_FILE_FALLBACK_CHARGE);
> 
> pages > 1, we have correct order, count_mthp_stat(order, MTHP_XXX) ?

Yes, I can use 'order' instead if a new version is needed.