scripts: Speedup MAX_SMP check
The current MAX_SMP check launches QEMU for every value of the SMP
parameter to check if the SMP parameter based on the native is higher
than the QEMU maximum supported configuration.
On something like a TX2, which has 224 threads, this takes a very long
time where the test script just sits there with no output.
Reduce the wait time by taking a right shift, reducing the maximum
number of iterations to log2 MAX_SMP.
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/scripts/runtime.bash b/scripts/runtime.bash
index 3f5f3e2..b7ab021 100644
--- a/scripts/runtime.bash
+++ b/scripts/runtime.bash
@@ -141,5 +141,5 @@
# just remove it...
while $RUNTIME_arch_run _NO_FILE_4Uhere_ -smp $MAX_SMP \
|& grep -qi 'exceeds max CPUs'; do
- ((--MAX_SMP))
+ MAX_SMP=$((MAX_SMP >> 1))
done
