[Mesa-stable] [PATCH] swr: Fix KNOB_MAX_WORKER_THREADS thread creation override.

[Andres Gomez]

Bruce, this depends on ead0dfe31ec7 which didn't make it for the 17.2
queue so I will be leaving out from there.

Let me know what you think.

On Tue, 2017-12-12 at 17:37 -0600, Bruce Cherniak wrote:
> Environment variable KNOB_MAX_WORKER_THREADS allows the user to override
> default thread creation and thread binding.  Previous commit to adjust
> linux cpu topology caused setting this KNOB to bind all threads to a single
> core.
> 
> This patch restores correct functionality of override.
> 
> Cc: <mesa-stable at lists.freedesktop.org>
> ---
>  src/gallium/drivers/swr/rasterizer/core/threads.cpp | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/src/gallium/drivers/swr/rasterizer/core/threads.cpp b/src/gallium/drivers/swr/rasterizer/core/threads.cpp
> index f4ddc21226..6242cb3fc7 100644
> --- a/src/gallium/drivers/swr/rasterizer/core/threads.cpp
> +++ b/src/gallium/drivers/swr/rasterizer/core/threads.cpp
> @@ -213,8 +213,7 @@ void CalculateProcessorTopology(CPUNumaNodes& out_nodes, uint32_t& out_numThread
>      {
>          for (auto &core : node.cores)
>          {
> -            out_numThreadsPerProcGroup = std::max((size_t)out_numThreadsPerProcGroup,
> -                                                  core.threadIds.size());
> +            out_numThreadsPerProcGroup += core.threadIds.size();
>          }
>      }
>  
-- 
Br,

Andres