[PATCH] drm/radeon: fence virtual address and free it once idle v3

[Christian König]

On 06.08.2012 18:30, Jerome Glisse wrote:
> On Mon, Aug 6, 2012 at 12:06 PM, Christian König
> <deathsimple at vodafone.de> wrote:
>> [SNIP]
>> Additional to that patch we still need a minor fix to mesa (just move
>> freeing the VM range after closing the handle). Going to send that in the
>> next minute to the mesa-dev list.
>>
>> Otherwise the patch indeed fixes the problem, but also isn't the best idea
>> for performance.
>>
>> Cheers,
>> Christian.
>>
> This does not impact performance, it's all about destroying bo/va so
> it's not a performance path. Or am i missing something here ?

radeonsi currently allocates very small BOs (8-32 bytes) for T# 
descriptors, and throws them away immediately after drawing.

That alone of course is insane under a performance aspect, but waiting 
for the last job to finish makes things completely worse.

It just moves my priorities of hacking on radeonsi a bit around.

Christian.