;
> iommu@lists.linux-foundation.org; linux...@kvack.org; Zhangfei Gao
> ; Liguozhu (Kenneth) ;
> linux-accelerat...@lists.ozlabs.org
> Subject: RE: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> > From: Jason Gunthorpe
> > Sent: Tuesday, February 2, 2021 7:44 AM
> &
> From: Jason Gunthorpe
> Sent: Tuesday, February 2, 2021 7:44 AM
>
> On Fri, Jan 29, 2021 at 10:09:03AM +, Tian, Kevin wrote:
> > > SVA is not doom to work with IO page fault only. If we have SVA+pin,
> > > we would get both sharing address and stable I/O latency.
> >
> > Isn't it like a tra
sts.linux-foundation.org; linux...@kvack.org; Zhangfei Gao
> ; Liguozhu (Kenneth) ;
> linux-accelerat...@lists.ozlabs.org
> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> On Fri, Jan 29, 2021 at 10:09:03AM +, Tian, Kevin wrote:
> > > SVA is not doom to
On Fri, Jan 29, 2021 at 10:09:03AM +, Tian, Kevin wrote:
> > SVA is not doom to work with IO page fault only. If we have SVA+pin,
> > we would get both sharing address and stable I/O latency.
>
> Isn't it like a traditional MAP_DMA API (imply pinning) plus specifying
> cpu_va of the memory po
l.org; iommu@lists.linux-foundation.org;
> linux...@kvack.org; Zhangfei Gao ; Liguozhu
> (Kenneth) ; linux-accelerat...@lists.ozlabs.org
> Subject: RE: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> > From: Song Bao Hua (Barry Song)
> > Sent: Tuesday, January 26, 2021 9:27 AM
hou (B) ; Greg Kroah-Hartman
> > ; Arnd Bergmann ;
> Zhangfei Gao
> > ; linux-accelerat...@lists.ozlabs.org;
> > linux-ker...@vger.kernel.org; iommu@lists.linux-foundation.org;
> > linux...@kvack.org; Liguozhu (Kenneth) ;
> chensihang
> > (A)
> > Subject: Re: [RFC
labs.org;
> linux-ker...@vger.kernel.org; iommu@lists.linux-foundation.org;
> linux...@kvack.org; Liguozhu (Kenneth) ; chensihang
> (A)
> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> On Tue, Jan 26, 2021 at 01:26:45AM +, Song Bao Hua (Barry Song) wrote:
> > > On
On Tue, Jan 26, 2021 at 01:26:45AM +, Song Bao Hua (Barry Song) wrote:
> > On Mon, Jan 25, 2021 at 11:35:22PM +, Song Bao Hua (Barry Song) wrote:
> >
> > > > On Mon, Jan 25, 2021 at 10:21:14PM +, Song Bao Hua (Barry Song)
> > > > wrote:
> > > > > mlock, while certainly be able to prev
On 2021/1/25 23:47, Jason Gunthorpe wrote:
> On Mon, Jan 25, 2021 at 04:34:56PM +0800, Zhou Wang wrote:
>
>> +static int uacce_pin_page(struct uacce_pin_container *priv,
>> + struct uacce_pin_address *addr)
>> +{
>> +unsigned int flags = FOLL_FORCE | FOLL_WRITE;
>> +un
x-ker...@vger.kernel.org; iommu@lists.linux-foundation.org;
> linux...@kvack.org; Liguozhu (Kenneth) ; chensihang
> (A)
> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> On Mon, Jan 25, 2021 at 11:35:22PM +, Song Bao Hua (Barry Song) wrote:
>
> > >
On Mon, Jan 25, 2021 at 11:35:22PM +, Song Bao Hua (Barry Song) wrote:
> > On Mon, Jan 25, 2021 at 10:21:14PM +, Song Bao Hua (Barry Song) wrote:
> > > mlock, while certainly be able to prevent swapping out, it won't
> > > be able to stop page moving due to:
> > > * memory compaction in al
On Mon, Jan 25, 2021 at 10:21:14PM +, Song Bao Hua (Barry Song) wrote:
> mlock, while certainly be able to prevent swapping out, it won't
> be able to stop page moving due to:
> * memory compaction in alloc_pages()
> * making huge pages
> * numa balance
> * memory compaction in CMA
Enabling th
o
> ; linux-accelerat...@lists.ozlabs.org;
> linux-ker...@vger.kernel.org; iommu@lists.linux-foundation.org;
> linux...@kvack.org; Liguozhu (Kenneth) ; chensihang
> (A)
> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> On Mon, Jan 25, 2021 at 10:21:1
;
> iommu@lists.linux-foundation.org; linux...@kvack.org; Song Bao Hua (Barry
> Song)
> ; Liguozhu (Kenneth) ;
> chensihang (A)
> Subject: Re: [RFC PATCH v2] uacce: Add uacce_ctrl misc device
>
> On Mon, Jan 25, 2021 at 04:34:56PM +0800, Zhou Wang wrote:
>
> > +static
On Mon, Jan 25, 2021 at 04:34:56PM +0800, Zhou Wang wrote:
> +static int uacce_pin_page(struct uacce_pin_container *priv,
> + struct uacce_pin_address *addr)
> +{
> + unsigned int flags = FOLL_FORCE | FOLL_WRITE;
> + unsigned long first, last, nr_pages;
> + struct
On 2021/1/25 17:28, Greg Kroah-Hartman wrote:
> On Mon, Jan 25, 2021 at 04:34:56PM +0800, Zhou Wang wrote:
>> +static int uacce_pin_page(struct uacce_pin_container *priv,
>> + struct uacce_pin_address *addr)
>> +{
>> +unsigned int flags = FOLL_FORCE | FOLL_WRITE;
>> +un
On Mon, Jan 25, 2021 at 04:34:56PM +0800, Zhou Wang wrote:
> +static int uacce_pin_page(struct uacce_pin_container *priv,
> + struct uacce_pin_address *addr)
> +{
> + unsigned int flags = FOLL_FORCE | FOLL_WRITE;
> + unsigned long first, last, nr_pages;
> + struct
Uacce driver supports to use devices in user space safely by SVA. However,
IO page fault may happen when doing DMA operations, which will affect DMA
performance severely.
For some accelerators which need stable performance, it is better to
avoid IO page fault totally. Current memory related APIs,
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