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authorDavid Ahern <dsahern@gmail.com>2012-09-13 14:59:15 -0600
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-10-24 14:20:11 -0200
commit2305c82fb35dd2c8c9533303bb1693f1636c66e4 (patch)
tree5a85edf5c7b1df1d65cfef7302279002edcd77bc /tools/perf/builtin-record.c
parent03f2f93ae00762eb881424df1c688d034fd341ee (diff)
perf tools: Give user better message if precise is not supported
Platforms (e.g., VM's) without support for precise mode get a confusing error message. e.g., $ perf record -e cycles:p -a -- sleep 1 Error: sys_perf_event_open() syscall returned with 95 (Operation not supported). /bin/dmesg may provide additional information. No hardware sampling interrupt available. No APIC? If so then you can boot the kernel with the "lapic" boot parameter to force-enable it. sleep: Terminated which is not clear that precise mode might be the root problem. With this patch: $ perf record -e cycles:p -fo /tmp/perf.data -- sleep 1 Error: 'precise' request may not be supported. Try removing 'p' modifier sleep: Terminated v2: softened message to 'may not be' supported per Robert's suggestion Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <robert.richter@amd.com> Link: http://lkml.kernel.org/r/1347569955-54626-4-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 73b5d7f9119..53c9892e96d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -317,6 +317,11 @@ try_again:
perf_evsel__name(pos));
rc = -err;
goto out;
+ } else if ((err == EOPNOTSUPP) && (attr->precise_ip)) {
+ ui__error("\'precise\' request may not be supported. "
+ "Try removing 'p' modifier\n");
+ rc = -err;
+ goto out;
}
printf("\n");