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From: Jason Wang <jasowang@redhat.com>
To: Peter Xu <peterx@redhat.com>,
	"Maoming (maoming,
	Cloud Infrastructure Service Product Dept.)" 
	<maoming.maoming@huawei.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"cohuck@redhat.com" <cohuck@redhat.com>,
	"Zhoujian (jay)" <jianjay.zhou@huawei.com>,
	"Huangweidong (C)" <weidong.huang@huawei.com>,
	"aarcange@redhat.com" <aarcange@redhat.com>,
	wangyunjian <wangyunjian@huawei.com>
Subject: Re: 答复: 答复: [PATCH V2] vfio dma_map/unmap: optimized for hugetlbfs pages
Date: Tue, 1 Sep 2020 10:40:29 +0800	[thread overview]
Message-ID: <a07f4db3-7680-14ac-dd1e-6851e051aa4e@redhat.com> (raw)
In-Reply-To: <20200828142400.GA3197@xz-x1>


On 2020/8/28 下午10:24, Peter Xu wrote:
> On Fri, Aug 28, 2020 at 09:23:08AM +0000, Maoming (maoming, Cloud Infrastructure Service Product Dept.) wrote:
>> In hugetlb_put_pfn(), I delete unpin_user_pages_dirty_lock() and use some simple code to put hugetlb pages.
>> Is this right?
> I think we should still use the APIs because of the the same reason.  However
> again I don't know the performance impact of that to your patch, but I still
> think that could be done inside gup itself when needed (e.g., a special path
> for hugetlbfs for [un]pinning continuous pages; though if that's the case that
> could be something to be discussed on -mm then as a separate patch, imho).
>
> Thanks,


+1, we should make this as a generic optimization instead of VFIO 
specific consider there're a lot of GUP users.

Thanks



  reply	other threads:[~2020-09-01  2:40 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-14  2:37 [PATCH V2] vfio dma_map/unmap: optimized for hugetlbfs pages Ming Mao
2020-08-20 18:38 ` Alex Williamson
2020-08-28  9:23   ` 答复: " Maoming (maoming, Cloud Infrastructure Service Product Dept.)
2020-08-25 20:59 ` Peter Xu
2020-08-26 13:56   ` 答复: " Maoming (maoming, Cloud Infrastructure Service Product Dept.)
2020-08-26 15:15     ` Peter Xu
2020-08-28  9:23       ` 答复: " Maoming (maoming, Cloud Infrastructure Service Product Dept.)
2020-08-28 14:24         ` Peter Xu
2020-09-01  2:40           ` Jason Wang [this message]
2020-09-01 12:10             ` 答复: " Maoming (maoming, Cloud Infrastructure Service Product Dept.)

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