[PATCH 1/2] perf kvm: Fix subcommand matching error
From: Yang Jihong
Date: Mon Aug 08 2022 - 05:27:14 EST
Currently, diff, top, buildid-list and stat use strncmp to match subcommands.
As a result, matching does not meet expectation.
For example:
# perf kvm diff1234
# Event 'cycles'
#
# Baseline Delta Abs Shared Object Symbol
# ........ ......... ............. ......
#
# Event 'dummy:HG'
#
# Baseline Delta Abs Shared Object Symbol
# ........ ......... ............. ......
#
# echo $?
0
#
Invalid information should be returned, but success is actually returned.
Solution: Use strstarts to match subcommands.
After:
# perf kvm diff1234
Usage: perf kvm [<options>] {top|record|report|diff|buildid-list|stat}
-i, --input <file> Input file name
-o, --output <file> Output file name
-v, --verbose be more verbose (show counter open errors, etc)
--guest Collect guest os data
--guest-code Guest code can be found in hypervisor process
--guestkallsyms <file>
file saving guest os /proc/kallsyms
--guestmodules <file>
file saving guest os /proc/modules
--guestmount <directory>
guest mount directory under which every guest os instance has a subdir
--guestvmlinux <file>
file saving guest os vmlinux
--host Collect host os data
# echo $?
129
#
Signed-off-by: Yang Jihong <yangjihong1@xxxxxxxxxx>
---
tools/perf/builtin-kvm.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 3696ae97f149..7d9ec1bac1a2 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1638,14 +1638,14 @@ int cmd_kvm(int argc, const char **argv)
return __cmd_record(file_name, argc, argv);
else if (strlen(argv[0]) > 2 && strstarts("report", argv[0]))
return __cmd_report(file_name, argc, argv);
- else if (!strncmp(argv[0], "diff", 4))
+ else if (strlen(argv[0]) > 2 && strstarts("diff", argv[0]))
return cmd_diff(argc, argv);
- else if (!strncmp(argv[0], "top", 3))
+ else if (!strcmp(argv[0], "top"))
return cmd_top(argc, argv);
- else if (!strncmp(argv[0], "buildid-list", 12))
+ else if (strlen(argv[0]) > 2 && strstarts("buildid-list", argv[0]))
return __cmd_buildid_list(file_name, argc, argv);
#ifdef HAVE_KVM_STAT_SUPPORT
- else if (!strncmp(argv[0], "stat", 4))
+ else if (strlen(argv[0]) > 2 && strstarts("stat", argv[0]))
return kvm_cmd_stat(file_name, argc, argv);
#endif
else
--
2.30.GIT