perf tests: Speed up metrics checking shell tests

Optimize the execution of the metric validation and metric listing shell
test suites:

1. `stat_metrics_values.sh`:
   The Python metric validator runs the `perf bench futex hash` workload
   for each validated metric relationship. Reduce the benchmark runtime
   limit from `-r 2` (2 seconds) to `-r 1` (1 second). This cuts the
   workload duration in half while still generating sufficient PMU events
   to satisfy non-zero threshold metric validations.

2. `stat_all_metrics.sh`:
   The metric checking test runs `perf stat` sequentially across all
   433+ listed metrics. Change the default workload for system-wide runs
   from `sleep 0.01` to `true`. This avoids the 10ms sleep delay on each
   sequential metric invocation, saving over 4 seconds of total wall
   time during full test suite runs.

Assisted-by: Antigravity:gemini-3.1-pro
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

0 files changed, 0 insertions, 0 deletions