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perf: Fix an error about perf cores usage

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There is an error when collecting the cpu usage data in perf.c.

The cpu busy data exceeds 100% when running perf tool with mutli-cores.

Signed-off-by: Jaylyn Ren <jaylyn.ren@arm.com>
Change-Id: I9a00f86a51fb52e115c37199aee6f849b235d868
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7431
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Jaylyn Ren 2021-04-16 14:15:17 +08:00 committed by Tomasz Zawadzki
parent 8651ef29ab
commit 5f179d8bd1
1 changed files with 1 additions and 1 deletions
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2
examples/nvme/perf/perf.c
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@ -1527,13 +1527,13 @@ print_periodic_performance(bool warmup)
if (g_monitor_perf_cores) {
core_busy_tsc += busy_tsc;
core_idle_tsc += idle_tsc;
core_busy_perc += (double)core_busy_tsc / (core_idle_tsc + core_busy_tsc) * 100;
}
}
mb_this_second = (double)io_this_second * g_io_size_bytes / (1024 * 1024);
printf("%s%9ju IOPS, %8.2f MiB/s", warmup ? "[warmup] " : "", io_this_second, mb_this_second);
if (g_monitor_perf_cores) {
core_busy_perc = (double)core_busy_tsc / (core_idle_tsc + core_busy_tsc) * 100;
printf("%3d Core(s): %6.2f%% Busy", g_num_workers, core_busy_perc);
}
printf("\r");