linux-kernel - Re: [PATCH 4/4] iommu/dma, numa: Use NUMA aware memory allocations in __iommu_dma_alloc

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Message-ID: <CAKTKpr6O9OpT+WgWStYda3EZcbwbs5dzp10SnEfDEt8Z-ZaAhA@mail.gmail.com>
Date:   Fri, 22 Sep 2017 21:14:51 +0530
From:   Ganapatrao Kulkarni <gklkml16@...il.com>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-mm@...ck.org,
        Will Deacon <Will.Deacon@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <hanjun.guo@...aro.org>,
        Joerg Roedel <joro@...tes.org>, vbabka@...e.cz,
        akpm@...ux-foundation.org, mhocko@...e.com,
        Tomasz.Nowicki@...ium.com, Robert.Richter@...ium.com,
        jnair@...iumnetworks.com
Subject: Re: [PATCH 4/4] iommu/dma, numa: Use NUMA aware memory allocations in __iommu_dma_alloc_pages

Hi Robin,


On Thu, Sep 21, 2017 at 5:11 PM, Robin Murphy <robin.murphy@....com> wrote:
> On 21/09/17 09:59, Ganapatrao Kulkarni wrote:
>> Change function __iommu_dma_alloc_pages to allocate memory/pages
>> for dma from respective device numa node.
>>
>> Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@...ium.com>
>> ---
>>  drivers/iommu/dma-iommu.c | 17 ++++++++++-------
>>  1 file changed, 10 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
>> index 9d1cebe..0626b58 100644
>> --- a/drivers/iommu/dma-iommu.c
>> +++ b/drivers/iommu/dma-iommu.c
>> @@ -428,20 +428,21 @@ static void __iommu_dma_free_pages(struct page **pages, int count)
>>       kvfree(pages);
>>  }
>>
>> -static struct page **__iommu_dma_alloc_pages(unsigned int count,
>> -             unsigned long order_mask, gfp_t gfp)
>> +static struct page **__iommu_dma_alloc_pages(struct device *dev,
>> +             unsigned int count, unsigned long order_mask, gfp_t gfp)
>>  {
>>       struct page **pages;
>>       unsigned int i = 0, array_size = count * sizeof(*pages);
>> +     int numa_node = dev_to_node(dev);
>>
>>       order_mask &= (2U << MAX_ORDER) - 1;
>>       if (!order_mask)
>>               return NULL;
>>
>>       if (array_size <= PAGE_SIZE)
>> -             pages = kzalloc(array_size, GFP_KERNEL);
>> +             pages = kzalloc_node(array_size, GFP_KERNEL, numa_node);
>>       else
>> -             pages = vzalloc(array_size);
>> +             pages = vzalloc_node(array_size, numa_node);
>
> kvzalloc{,_node}() didn't exist when this code was first written, but it
> does now - since you're touching it you may as well get rid of the whole
> if-else and array_size local.

thanks, i will update in next version.
>
> Further nit: some of the indentation below is a bit messed up.

ok, will fix it.
>
> Robin.
>
>>       if (!pages)
>>               return NULL;
>>
>> @@ -462,8 +463,9 @@ static struct page **__iommu_dma_alloc_pages(unsigned int count,
>>                       unsigned int order = __fls(order_mask);
>>
>>                       order_size = 1U << order;
>> -                     page = alloc_pages((order_mask - order_size) ?
>> -                                        gfp | __GFP_NORETRY : gfp, order);
>> +                     page = alloc_pages_node(numa_node,
>> +                                     (order_mask - order_size) ?
>> +                                gfp | __GFP_NORETRY : gfp, order);
>>                       if (!page)
>>                               continue;
>>                       if (!order)
>> @@ -548,7 +550,8 @@ struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
>>               alloc_sizes = min_size;
>>
>>       count = PAGE_ALIGN(size) >> PAGE_SHIFT;
>> -     pages = __iommu_dma_alloc_pages(count, alloc_sizes >> PAGE_SHIFT, gfp);
>> +     pages = __iommu_dma_alloc_pages(dev, count, alloc_sizes >> PAGE_SHIFT,
>> +                     gfp);
>>       if (!pages)
>>               return NULL;
>>
>>
>

thanks
Ganapat