perf tools: Improve ambiguous option help message
Currently if an option name is ambiguous it only prints first two matched option names but no help. It'd be better it could show all possible names and help messages too. Before: $ perf report --show Error: Ambiguous option: show (could be --show-total-period or --show-ref-call-graph) Usage: perf report [<options>] After: $ perf report --show Error: Ambiguous option: show (could be --show-total-period or --show-ref-call-graph) Usage: perf report [<options>] -n, --show-nr-samples Show a column with the number of samples --showcpuutilization Show sample percentage for different cpu modes -I, --show-info Display extended information about perf.data file --show-total-period Show a column with the sum of periods --show-ref-call-graph Show callgraph from reference event Signed-off-by: NNamhyung Kim <namhyung@kernel.org> Acked-by: NIngo Molnar <mingo@kernel.org> Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1445701767-12731-1-git-send-email-namhyung@kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
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