linux-kernel - Re: [PATCH 2/3] mm: introduce memory type MEMORY_DEVICE_DEV

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Date:   Thu, 5 Jul 2018 21:20:35 +0800
From:   zhangyi6 <yi.z.zhang@...el.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Zhang Yi <yi.z.zhang@...ux.intel.com>
Cc:     KVM list <kvm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Paolo Bonzini <pbonzini@...hat.com>, Jan Kara <jack@...e.cz>,
        Christoph Hellwig <hch@....de>,
        "Zhang, Yu C" <yu.c.zhang@...el.com>,
        Linux MM <linux-mm@...ck.org>, rkrcmar@...hat.com
Subject: Re: [PATCH 2/3] mm: introduce memory type MEMORY_DEVICE_DEV_DAX



On 2018年07月04日 22:50, Dan Williams wrote:
> On Wed, Jul 4, 2018 at 8:30 AM, Zhang Yi <yi.z.zhang@...ux.intel.com> wrote:
>> Currently, NVDIMM pages will be marked 'PageReserved'. However, unlike
>> other reserved PFNs, pages on NVDIMM shall still behave like normal ones
>> in many cases, i.e. when used as backend memory of KVM guest. This patch
>> introduces a new memory type, MEMORY_DEVICE_DEV_DAX. Together with the
>> existing type MEMORY_DEVICE_FS_DAX, we can differentiate the pages on
>> NVDIMM with the normal reserved pages.
>>
>> Signed-off-by: Zhang Yi <yi.z.zhang@...ux.intel.com>
>> Signed-off-by: Zhang Yu <yu.c.zhang@...ux.intel.com>
>> ---
>>  drivers/dax/pmem.c       | 1 +
>>  include/linux/memremap.h | 1 +
>>  2 files changed, 2 insertions(+)
>>
>> diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
>> index fd49b24..fb3f363 100644
>> --- a/drivers/dax/pmem.c
>> +++ b/drivers/dax/pmem.c
>> @@ -111,6 +111,7 @@ static int dax_pmem_probe(struct device *dev)
>>                 return rc;
>>
>>         dax_pmem->pgmap.ref = &dax_pmem->ref;
>> +       dax_pmem->pgmap.type = MEMORY_DEVICE_DEV_DAX;
>>         addr = devm_memremap_pages(dev, &dax_pmem->pgmap);
>>         if (IS_ERR(addr))
>>                 return PTR_ERR(addr);
>> diff --git a/include/linux/memremap.h b/include/linux/memremap.h
>> index 5ebfff6..4127bf7 100644
>> --- a/include/linux/memremap.h
>> +++ b/include/linux/memremap.h
>> @@ -58,6 +58,7 @@ enum memory_type {
>>         MEMORY_DEVICE_PRIVATE = 1,
>>         MEMORY_DEVICE_PUBLIC,
>>         MEMORY_DEVICE_FS_DAX,
>> +       MEMORY_DEVICE_DEV_DAX,
> Please add documentation for this new type to the comment block about
> this definition.
Thanks for your comments Dan, Will add it in next version,
Regards
Yi.