[igt-dev] [PATCH i-g-t 0/3] lib/i915/perf: Speed up the build

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The perf xml stuff generates terrible C code that is giving
gcc a big headache and leading to disgustingly long build 
times. Try to generate a bit more sensible code to speed
up the build.

Total build time change for the series:
$ ninja -Cbuild  clean
$ time ninja -Cbuild 
 ADL (4+8 cores):
  - real        1m18,244s
  + real        0m36,695s
 VLV (2 cores):
  - real        17m29.100s
  + real        9m44.268s

For comparison this is what I get if I skip all the perf xml
files apart from hsw:
 ADL:
  real  0m20,080s
 VLV
  real  7m3.045s

Thinking of further ways to reduce this... There are about a
thousand "Ext" metric sets. Are those *actually* useful or
could we just skip them? That would give us a total build 
time of:
 ADL:
  real  0m24,593s
 VLV:
  real  8m15.977s

Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: Umesh Nerlige Ramappa <umesh.nerlige.ramappa at intel.com>

Ville Syrjälä (3):
  lib/i915/perf: Stop generating silly C code
  lib/i915/perf: Stop making copies of the registers
  lib/i915/perf: Convert the metric counters to an array as well

 .../perf-configs/perf-metricset-codegen.py    | 81 ++++++++++++++-----
 .../perf-configs/perf-registers-codegen.py    | 30 +++----
 lib/i915/perf.h                               |  8 +-
 3 files changed, 78 insertions(+), 41 deletions(-)

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2.39.2