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Do not enable stack tracer for ZFS performance test
Linux ZFS test suite runs with /proc/sys/kernel/stack_tracer_enabled=1, via zfs.sh script, which has negative performance impact, up to 40%. Since large stack is a rare issue now, preferred behavior would be: - making stack tracer an opt-in feature for zfs.sh - zfs-test.sh enables stack tracer only when requested Signed-off-by: Tony Nguyen <firstname.lastname@example.org>
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