linux-kernel - Re: [PATCH v6 1/2] mm: Abstract THP allocation

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Message-ID: <29f94c69-ca62-48cf-a69b-797e89284540@arm.com>
Date: Mon, 7 Oct 2024 10:08:10 +0530
From: Dev Jain <dev.jain@....com>
To: David Hildenbrand <david@...hat.com>, akpm@...ux-foundation.org,
 willy@...radead.org, kirill.shutemov@...ux.intel.com
Cc: ryan.roberts@....com, anshuman.khandual@....com, catalin.marinas@....com,
 cl@...two.org, vbabka@...e.cz, mhocko@...e.com, apopple@...dia.com,
 dave.hansen@...ux.intel.com, will@...nel.org, baohua@...nel.org,
 jack@...e.cz, mark.rutland@....com, hughd@...gle.com,
 aneesh.kumar@...nel.org, yang@...amperecomputing.com, peterx@...hat.com,
 ioworker0@...il.com, jglisse@...gle.com, wangkefeng.wang@...wei.com,
 ziy@...dia.com, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v6 1/2] mm: Abstract THP allocation


On 9/30/24 14:15, David Hildenbrand wrote:
> On 30.09.24 07:28, Dev Jain wrote:
>> In preparation for the second patch, abstract away the THP allocation
>> logic present in the create_huge_pmd() path, which corresponds to the
>> faulting case when no page is present.
>>
>> There should be no functional change as a result of applying this patch,
>> except that, as David notes at [1], a PMD-aligned address should
>> be passed to update_mmu_cache_pmd().
>>
>> [1]: 
>> https://lore.kernel.org/all/ddd3fcd2-48b3-4170-bcaa-2fe66e093f43@redhat.com/
>>
>> Acked-by: David Hildenbrand <david@...hat.com>
>> Reviewed-by: Kefeng Wang <wangkefeng.wang@...wei.com>
>> Signed-off-by: Dev Jain <dev.jain@....com>
>> ---
>>   mm/huge_memory.c | 98 ++++++++++++++++++++++++++++--------------------
>>   1 file changed, 57 insertions(+), 41 deletions(-)
>>
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index 4e34b7f89daf..e3bcdbc9baa2 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -1148,47 +1148,81 @@ unsigned long thp_get_unmapped_area(struct 
>> file *filp, unsigned long addr,
>>   }
>>   EXPORT_SYMBOL_GPL(thp_get_unmapped_area);
>>   -static vm_fault_t __do_huge_pmd_anonymous_page(struct vm_fault *vmf,
>> -            struct page *page, gfp_t gfp)
>> +static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct 
>> *vma,
>> +                          unsigned long addr)
>
> Just a nit as I am skimming over this once more:
>
> We try to make any new code / code we touch to use a 2-tab
> indentation for the second parameter line.
>
> E.g.,
>
> static struct folio *vma_alloc_anon_folio_pmd(struct vm_area_struct *vma,
>         unsigned long addr)
> {

Ah sorry, didn't know about this. I used to align it with the function 
parameter opening bracket.
>
>