[Mesa-stable] [Mesa-dev] [PATCH 2/2] intel/fs: Take into account amount of data read in spilling cost heuristic.

[Jason Ekstrand]

Both are

Reviewed-by: Jason Ekstrand <jason at jlekstrand.net>

On Fri, Apr 21, 2017 at 12:05 PM, Manolova, Plamena <
plamena.manolova at intel.com> wrote:

> Hi Curro,
> This series looks good to me :)
>
> Reviewed-by: Plamena Manolova <plamena.manolova at intel.com>
>
> On Fri, Apr 21, 2017 at 11:49 AM, Francisco Jerez <currojerez at riseup.net>
> wrote:
>
>> Until now the spilling cost calculation was neglecting the amount of
>> data read from the register during the spilling cost calculation.
>> This caused it to make suboptimal decisions in some cases leading to
>> higher memory bandwidth usage than necessary.
>>
>> Improves Unigine Heaven performance by ~4% on BDW, reversing an
>> unintended FPS regression from my previous commit
>> 147e71242ce539ff28e282f009c332818c35f5ac with n=12 and statistical
>> significance 5%.  In addition SynMark2 OglCSDof performance is
>> improved by an additional ~5% on SKL, and a Kerbal Space Program
>> apitrace around the Moho planet I can provide on request improves by
>> ~20%.
>>
>> Cc: <mesa-stable at lists.freedesktop.org>
>> ---
>>  src/intel/compiler/brw_fs_reg_allocate.cpp | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/src/intel/compiler/brw_fs_reg_allocate.cpp
>> b/src/intel/compiler/brw_fs_reg_allocate.cpp
>> index 2d4d46e..ec8e116 100644
>> --- a/src/intel/compiler/brw_fs_reg_allocate.cpp
>> +++ b/src/intel/compiler/brw_fs_reg_allocate.cpp
>> @@ -822,7 +822,7 @@ fs_visitor::choose_spill_reg(struct ra_graph *g)
>>     foreach_block_and_inst(block, fs_inst, inst, cfg) {
>>        for (unsigned int i = 0; i < inst->sources; i++) {
>>          if (inst->src[i].file == VGRF)
>> -            spill_costs[inst->src[i].nr] += block_scale;
>> +            spill_costs[inst->src[i].nr] += regs_read(inst, i) *
>> block_scale;
>>        }
>>
>>        if (inst->dst.file == VGRF)
>> --
>> 2.10.2
>>
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>>
>
>
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