Revert: remove the probe-driver-swap fast-feedback job

Added in a3f1573 for fast iteration on install_gpu_driver.sh; no
longer needed now that the script has stabilized.

Author: leofang

.github/workflows/ci.yml

@@ -413,76 +413,6 @@ jobs:
     with:
       is-release: ${{ github.ref_type == 'tag' }}
 
-  # Fast-feedback probe for changes to ci/tools/install_gpu_driver.sh.
-  # Allocates one L4 GPU + container, runs the driver swap to a
-  # hard-coded version, then drives nvmlDeviceSetPersistenceMode via
-  # raw ctypes -- the *exact* NVML call that cuda.core's
-  # test_persistence_mode_enabled exercises. Total runtime is ~5 min
-  # vs. ~30 min for a full test matrix; runs on every PR push so we
-  # can iterate on `ci/tools/install_gpu_driver.sh` quickly.
-  probe-driver-swap:
-    name: Probe custom-DRIVER install
-    if: ${{ github.repository_owner == 'nvidia' && !cancelled() }}
-    runs-on: "linux-amd64-gpu-l4-latest-1"
-    timeout-minutes: 15
-    defaults:
-      run:
-        shell: bash --noprofile --norc -xeuo pipefail {0}
-    container:
-      options: -u root --security-opt seccomp=unconfined --shm-size 16g --privileged --pid=host
-      image: ubuntu:22.04
-      env:
-        NVIDIA_VISIBLE_DEVICES: ${{ env.NVIDIA_VISIBLE_DEVICES }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
-
-      - name: Install host deps
-        run: |
-          apt-get update -qq
-          apt-get -y install --no-install-recommends util-linux python3
-
-      - name: Install GPU driver
-        env:
-          DRIVER: '610.43.02'
-          GPU_TYPE: 'l4'
-        run: ./ci/tools/install_gpu_driver.sh
-
-      - name: Show post-install host + container state
-        run: |
-          nvidia-smi --query-gpu=name,driver_version,persistence_mode --format=csv
-          echo
-          echo "=== /run/nvidia-persistenced ==="
-          ls -la /run/nvidia-persistenced/ 2>&1 || echo "MISSING"
-          echo
-          echo "=== nvidia-persistenced process ==="
-          pgrep -laf nvidia-persistenced || echo "(none)"
-
-      - name: Drive nvmlDeviceSetPersistenceMode via ctypes
-        run: |
-          python3 <<'PYEOF'
-          import ctypes, sys
-          NVML_SUCCESS, NVML_ERROR_NO_PERMISSION, NVML_ERROR_UNKNOWN = 0, 4, 999
-          nvml = ctypes.CDLL("libnvidia-ml.so.1")
-          assert nvml.nvmlInit_v2() == 0, "nvmlInit_v2 failed"
-          h = ctypes.c_void_p()
-          assert nvml.nvmlDeviceGetHandleByIndex_v2(0, ctypes.byref(h)) == 0
-          m = ctypes.c_uint(99)
-          nvml.nvmlDeviceGetPersistenceMode(h, ctypes.byref(m))
-          print(f"current persistence_mode = {m.value} (1=ENABLED, 0=DISABLED)")
-          ret = nvml.nvmlDeviceSetPersistenceMode(h, 0)
-          print(f"SET DISABLED -> {ret}  # 0=SUCCESS, 4=NO_PERMISSION, 999=UNKNOWN")
-          if ret == NVML_ERROR_UNKNOWN:
-              print("FAIL: NVML_ERROR_UNKNOWN -- daemon-down failure mode reproduced", file=sys.stderr)
-              sys.exit(1)
-          if ret != NVML_SUCCESS:
-              print(f"FAIL: unexpected return code {ret}", file=sys.stderr)
-              sys.exit(1)
-          # restore
-          nvml.nvmlDeviceSetPersistenceMode(h, m.value)
-          print("OK")
-          PYEOF
-
   checks:
     name: Check job status
     if: always()