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authorJakub Kicinski <jakub.kicinski@netronome.com>2018-06-14 11:06:55 -0700
committerDaniel Borkmann <daniel@iogearbox.net>2018-06-15 03:13:17 +0200
commit07480cbc05ef1ff7301cb11afb7d894ad3d0916a (patch)
tree53f9b6e995b1f7d2f2348288bb047638a491f7fb /tools/bpf
parent3bce593ac06b4f18710274cfb084369b3d7909eb (diff)
downloadlinux-07480cbc05ef1ff7301cb11afb7d894ad3d0916a.tar.bz2
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: 71bb428fe2c1 ("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>
Diffstat (limited to 'tools/bpf')
-rw-r--r--tools/bpf/bpftool/prog.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index a4f435203fef..05f42a46d6ed 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -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);