[PATCH 2/3] drm/vmwgfx: Copy DRM hash-table code into driver

[Thomas Zimmermann]

Hi Sam

Am 15.11.21 um 17:27 schrieb Sam Ravnborg:
> Hi Thomas,
> 
> On Mon, Nov 15, 2021 at 01:55:38PM +0100, Thomas Zimmermann wrote:
>> Besides some legacy code, vmwgfx is the only user of DRM's hash-
>> table implementation. Copy the code into the driver, so that the
>> core code can be retired.
> For the record - I have no clue what legacy code uses the DRM hash-table
> for.
> 
>>
>> No functional changes. However, the real solution for vmwgfx is to
>> use Linux' generic hash-table functions.
> Would it be possible to use the Linux hash-table now rather than this
> mid-step where a lot of code is added to wmgfx only to be removed
> later?

I indeed considered to replace the hashtable with Linux' implementation. 
But the differences are slightly more involved than just API changes and 
a hashtable's performance often depends on its configuration. In the 
end, I didn't feel confident enough to make this change without doing 
damage.

> 
> If we go for this way then a todo item to fix this in wmgfx so someone
> can fix this later would be nice.

Sure. I'll add one. Zack already seems interested in having someone from 
his team working on it.

Best regards
Thomas

> 
> 	Sam
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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