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From: John Garry <john.garry@huawei.com>
To: Yongji Xie <xieyongji@bytedance.com>
Cc: "Will Deacon" <will@kernel.org>,
	"Michael S. Tsirkin" <mst@redhat.com>, kvm <kvm@vger.kernel.org>,
	"Jason Wang" <jasowang@redhat.com>,
	virtualization <virtualization@lists.linux-foundation.org>,
	"Christian Brauner" <christian.brauner@canonical.com>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Christoph Hellwig" <hch@infradead.org>,
	"Dan Carpenter" <dan.carpenter@oracle.com>,
	"Stefano Garzarella" <sgarzare@redhat.com>,
	"Liu Xiaodong" <xiaodong.liu@intel.com>,
	linux-fsdevel@vger.kernel.org,
	"Al Viro" <viro@zeniv.linux.org.uk>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	songmuchun@bytedance.com, "Jens Axboe" <axboe@kernel.dk>,
	"He Zhe" <zhe.he@windriver.com>,
	"Greg KH" <gregkh@linuxfoundation.org>,
	"Randy Dunlap" <rdunlap@infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	iommu@lists.linux-foundation.org, bcrl@kvack.org,
	netdev@vger.kernel.org, "Joe Perches" <joe@perches.com>,
	"Robin Murphy" <robin.murphy@arm.com>,
	"Mika Penttilä" <mika.penttila@nextfour.com>
Subject: Re: [PATCH v11 01/12] iova: Export alloc_iova_fast() and free_iova_fast()
Date: Fri, 27 Aug 2021 10:03:03 +0100	[thread overview]
Message-ID: <d7b5967f-0a43-785a-82b0-74cce5993ba0@huawei.com> (raw)
In-Reply-To: <CACycT3uWyhNNK_YbfEAEhTk-V9CoxFg1tzVjJnXeKBFpkndnfg@mail.gmail.com>

On 25/08/2021 13:17, Yongji Xie wrote:
>> JFYI, There was a preliminary discussion to move the iova rcache code
>> (which the iova fast alloc and free functions are based on) out of the
>> iova code and maybe into dma-iommu (being the only user). There was
>> other motivation.
>>
> Would it be better to move the code into ./lib as a general library?

For a start we/I think that the rcache could be removed from the IOVA 
code, but prob should stay in drivers/iommu. I had another IOVA issue to 
solve, which complicates things. No solid plans. Need to talk to Robin more.

> 
>> https://lore.kernel.org/linux-iommu/83de3911-145d-77c8-17c1-981e4ff825d3@arm.com/
>>
>> Having more users complicates that...
>>
> Do we have some plan for this work? From our test [1],
> iova_alloc_fast() is much better than iova_alloc(). So I'd like to use
> it as much as possible
> 
> [1]https://lore.kernel.org/kvm/CACycT3steXFeg7NRbWpo2J59dpYcumzcvM2zcPJAVe40-EvvEg@mail.gmail.com/

Well if you're alloc'ing and free'ing IOVAs a lot then I can imagine it is.

Thanks,
John

  reply	other threads:[~2021-08-27  8:59 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 12:06 [PATCH v11 00/12] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-18 12:06 ` [PATCH v11 01/12] iova: Export alloc_iova_fast() and free_iova_fast() Xie Yongji
2021-08-23  6:24   ` Jason Wang
2021-08-24 18:08   ` Michael S. Tsirkin
2021-08-25  9:55     ` Will Deacon
2021-08-25 10:39       ` John Garry
2021-08-25 12:17         ` Yongji Xie
2021-08-27  9:03           ` John Garry [this message]
2021-08-18 12:06 ` [PATCH v11 02/12] file: Export receive_fd() to modules Xie Yongji
2021-08-18 12:06 ` [PATCH v11 03/12] vdpa: Fix some coding style issues Xie Yongji
2021-08-23  6:27   ` Jason Wang
2021-08-24 11:09   ` Stefano Garzarella
2021-08-18 12:06 ` [PATCH v11 04/12] vdpa: Add reset callback in vdpa_config_ops Xie Yongji
2021-08-23  6:31   ` Jason Wang
2021-08-23  7:44     ` Yongji Xie
2021-08-18 12:06 ` [PATCH v11 05/12] vhost-vdpa: Handle the failure of vdpa_reset() Xie Yongji
2021-08-23  6:32   ` Jason Wang
2021-08-24 11:12   ` Stefano Garzarella
2021-08-18 12:06 ` [PATCH v11 06/12] vhost-iotlb: Add an opaque pointer for vhost IOTLB Xie Yongji
2021-08-18 12:06 ` [PATCH v11 07/12] vdpa: Add an opaque pointer for vdpa_config_ops.dma_map() Xie Yongji
2021-08-18 12:06 ` [PATCH v11 08/12] vdpa: factor out vhost_vdpa_pa_map() and vhost_vdpa_pa_unmap() Xie Yongji
2021-08-18 12:06 ` [PATCH v11 09/12] vdpa: Support transferring virtual addressing during DMA mapping Xie Yongji
2021-08-18 12:06 ` [PATCH v11 10/12] vduse: Implement an MMU-based software IOTLB Xie Yongji
2021-08-27  8:57   ` John Garry
2021-08-27  9:25     ` Yongji Xie
2021-08-18 12:06 ` [PATCH v11 11/12] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2021-08-23  6:56   ` Jason Wang
2021-08-24 18:10   ` Michael S. Tsirkin
2021-08-25  5:37     ` Yongji Xie
2021-08-18 12:06 ` [PATCH v11 12/12] Documentation: Add documentation for VDUSE Xie Yongji
2021-08-23  6:57   ` Jason Wang
2021-08-23  7:54   ` Jason Wang

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