perf test: Do not compare overheads in the zstd comp test

The overhead can vary on each run so it'd make the test failed
sometimes. Also order of hist entry can change.

Use perf report -F option to omit the overhead field and sort the
result alphabetically.

Signed-off-by: Namhyung Kim <[e-mail]>
Acked-by: Ian Rogers <[e-mail]>
Cc: Alexei Budankov <[e-mail]>
Cc: Andi Kleen <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Thomas Richter <[e-mail]>
Link: http://lore.kernel.org/lkml/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/tests/shell/record+zstd_comp_decomp.sh

···
 
 check_compressed_output() {
 	$perf_tool inject -i $trace_file -o $trace_file.decomp &&
-	$perf_tool report -i $trace_file --stdio | head -n -3 > $trace_file.comp.output &&
-	$perf_tool report -i $trace_file.decomp --stdio | head -n -3 > $trace_file.decomp.output &&
+	$perf_tool report -i $trace_file --stdio -F comm,dso,sym | head -n -3 > $trace_file.comp.output &&
+	$perf_tool report -i $trace_file.decomp --stdio -F comm,dso,sym | head -n -3 > $trace_file.decomp.output &&
 	diff $trace_file.comp.output $trace_file.decomp.output
 }