linux-kernel - Re: [PATCH vhost 2/2] vdpa/mlx5: Fix suboptimal range on iotlb iteration

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Message-ID: <83e533ff-e7cc-41e3-8632-7c4e3f6af8b7@nvidia.com>
Date: Wed, 13 Nov 2024 16:01:05 +0100
From: Dragos Tatulea <dtatulea@...dia.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: virtualization@...ts.linux.dev, Si-Wei Liu <si-wei.liu@...cle.com>,
 Jason Wang <jasowang@...hat.com>, Eugenio Perez Martin
 <eperezma@...hat.com>, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Gal Pressman <gal@...dia.com>, Parav Pandit <parav@...dia.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Subject: Re: [PATCH vhost 2/2] vdpa/mlx5: Fix suboptimal range on iotlb
 iteration



On 13.11.24 15:49, Michael S. Tsirkin wrote:
> On Wed, Nov 13, 2024 at 03:33:35PM +0100, Dragos Tatulea wrote:
>>
>>
>> On 13.11.24 07:32, Michael S. Tsirkin wrote:
>>> On Mon, Oct 21, 2024 at 04:40:40PM +0300, Dragos Tatulea wrote:
>>>> From: Si-Wei Liu <si-wei.liu@...cle.com>
>>>>
>>>> The starting iova address to iterate iotlb map entry within a range
>>>> was set to an irrelevant value when passing to the itree_next()
>>>> iterator, although luckily it doesn't affect the outcome of finding
>>>> out the granule of the smallest iotlb map size. Fix the code to make
>>>> it consistent with the following for-loop.
>>>>
>>>> Fixes: 94abbccdf291 ("vdpa/mlx5: Add shared memory registration code")
>>>
>>>
>>> But the cover letter says "that's why it does not have a fixes tag".
>>> Confused.
>> Sorry about that. Patch is fine with fixes tag, I forgot to drop that
>> part of the sentence from the cover letter.
>>
>> Let me know if I need to resend something.
>>
>> Thanks,
>> Dragos
> 
> But why does it need the fixes tag? That one means "if you have
> that hash, you need this patch". Pls do not abuse it for
> optimizations.
> 
Well, it is a fix but it happens that the code around still works without
this fix. I figured that it would be better to take it into older stable kernels
just like the other one. But if you consider it an improvement I will send a v2
without the Fixes tag.

Thanks,
Dragos