[PATCH v1] perf test: stat metrics cgroup strip possible slash from cgroup name

[Ian Rogers <irogers@google.com>]

The grep to match cgroup name in metric output assumes no leading / on
the cgroup name, however, cgroups in /proc/self/cgroup may have a
leading /. Strip the / if it exists to avoid failures to match the
cgroup name in the perf stat output.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/tests/shell/stat_metrics_cgrp.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/perf/tests/shell/stat_metrics_cgrp.sh b/tools/perf/tests/shell/stat_metrics_cgrp.sh
index d4226ee0ae98..0728f48f21fa 100755
--- a/tools/perf/tests/shell/stat_metrics_cgrp.sh
+++ b/tools/perf/tests/shell/stat_metrics_cgrp.sh
@@ -86,6 +86,13 @@ check_metric_reported()
 
 	for cgrp in "${cgrps[@]}"; do
 		# Find metric lines for this cgroup
+		case "$cgrp" in
+			/)  # The root cgroup, leave unchanged.
+			  ;;
+			/*) # Strip any starting slashes.
+			  cgrp="${cgrp#/}"
+			  ;;
+		esac
 		# We use exact cgroup match with surrounding commas
 		local cgrp_lines
 		cgrp_lines=$(echo "${output}" | grep -F ",${cgrp}," | grep "insn_per_cycle" || true)
-- 
2.55.0.1082.g2b9226bbc0-goog