Commit 07480cbc authored Jun 14, 2018 by Jakub Kicinski Committed by Daniel Borkmann Jun 15, 2018

tools: bpftool: improve accuracy of load time



BPF program load time is reported from the kernel relative to boot time.
If conversion to wall clock does not take nanosecond parts into account,
the load time reported by bpftool may differ by one second from run to
run.  This means JSON object reported by bpftool for a program will
randomly change.

Fixes: 71bb428f ("tools: bpf: add bpftool")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent 3bce593a

tools/bpf/bpftool/prog.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -90,7 +90,9 @@ static void print_boot_time(__u64 nsecs, char *buf, unsigned int size)
		}

		wallclock_secs = (real_time_ts.tv_sec - boot_time_ts.tv_sec) +
		nsecs / 1000000000;
		(real_time_ts.tv_nsec - boot_time_ts.tv_nsec + nsecs) /
		1000000000;


		if (!localtime_r(&wallclock_secs, &load_tm)) {
		snprintf(buf, size, "%llu", nsecs / 1000000000);

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