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app/trace: check num_entries before referring

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For trace file which is generated by spdk trace_record,
if one lcore recorded no entries, there is no space for
it to have idle entries to referring.

Change-Id: I1cd89ec934407fc805bda66c8c87f76cb181679e
Signed-off-by: Xiaodong Liu <xiaodong.liu@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/449840
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Xiaodong Liu 2019-04-02 00:55:58 +08:00 committed by Changpeng Liu
parent 0c41a7ce95
commit 1468f8dd3b
1 changed files with 2 additions and 2 deletions
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4
app/trace/trace.cpp
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@ -411,7 +411,7 @@ int main(int argc, char **argv)
if (lcore == SPDK_TRACE_MAX_LCORE) {
for (i = 0; i < SPDK_TRACE_MAX_LCORE; i++) {
history = spdk_get_per_lcore_history(g_histories, i);
if (history->entries[0].tsc == 0) {
if (history->num_entries == 0 || history->entries[0].tsc == 0) {
continue;
}
@ -423,7 +423,7 @@ int main(int argc, char **argv)
}
} else {
history = spdk_get_per_lcore_history(g_histories, lcore);
if (history->entries[0].tsc != 0) {
if (history->num_entries > 0 && history->entries[0].tsc != 0) {
if (g_verbose && history->num_entries) {
printf("Trace Size of lcore (%d): %ju\n", lcore, history->num_entries);
}