Messages in this thread Patch in this message | | | From | Paul Menzel <> | Subject | [PATCH 2/2] torture: Make thread detection more robust by using lspcu | Date | Tue, 22 Feb 2022 13:07:17 +0100 |
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For consecutive numbers *lscpu* collapses the output and just shows the range with start and end. The processors are numbered that way on POWER8.
$ sudo ppc64_cpu --smt=8 $ lscpu | grep '^NUMA node' NUMA node(s): 2 NUMA node0 CPU(s): 0-79 NUMA node8 CPU(s): 80-159
This causes the heuristic to detect the number threads per core, looking for the number after the first comma, to fail, and QEMU aborts because of invalid arguments.
$ lscpu | sed -n -e '/^NUMA node0/s/^[^,]*,\([0-9]*\),.*$/\1/p' $
(Before the last patch, the whole line was returned.)
$ lscpu | grep '^NUMA node0' | sed -e 's/^[^,-]*(,|\-)\([0-9]*\),.*$/\1/' NUMA node0 CPU(s): 0-79
*lscpu* shows the number of threads per core, so use that value directly.
$ sudo ppc64_cpu --smt=8 $ lscpu | grep 'Thread(s) per core' Thread(s) per core: 8 $ sudo ppc64_cpu --smt=off $ lscpu | grep 'Thread(s) per core' Thread(s) per core: 1
Note, the replaced heuristic is also incorrect for that case, where the threads per core are disabled.
$ lscpu | sed -n -e '/^NUMA node0/s/^[^,]*,\([0-9]*\),.*$/\1/p' 8
Signed-off-by: Paul Menzel <pmenzel@molgen.mpg.de> --- tools/testing/selftests/rcutorture/bin/functions.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/rcutorture/bin/functions.sh b/tools/testing/selftests/rcutorture/bin/functions.sh index 5cff520955e6..66d0414d8e4b 100644 --- a/tools/testing/selftests/rcutorture/bin/functions.sh +++ b/tools/testing/selftests/rcutorture/bin/functions.sh @@ -301,7 +301,7 @@ specify_qemu_cpus () { echo $2 -smp $3 ;; qemu-system-ppc64) - nt="`lscpu | sed -n -e '/^NUMA node0/s/^[^,]*,\([0-9]*\),.*$/\1/p'`" + nt="`lscpu | sed -n 's/^Thread(s) per core:\s*//p'`" echo $2 -smp cores=`expr \( $3 + $nt - 1 \) / $nt`,threads=$nt ;; esac -- 2.35.1
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