Helper function bpf_ktime_get_ns
Definition
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
Return the time elapsed since system boot, in nanoseconds. Does not include time the system was suspended. See: clock_gettime(CLOCK_MONOTONIC)
Returns
Current ktime.
static __u64 (* const bpf_ktime_get_ns)(void) = (void *) 5;
Usage
Returns a 64-bit value representing the current kernel time in nanoseconds since the system boot, excluding any time the system was suspended. This can be useful for measuring time intervals or generating timestamps in eBPF programs.
Program types
This helper call can be used in the following program types:
BPF_PROG_TYPE_CGROUP_DEVICEBPF_PROG_TYPE_CGROUP_SKBBPF_PROG_TYPE_CGROUP_SOCKBPF_PROG_TYPE_CGROUP_SOCKOPTBPF_PROG_TYPE_CGROUP_SOCK_ADDRBPF_PROG_TYPE_CGROUP_SYSCTLBPF_PROG_TYPE_FLOW_DISSECTORBPF_PROG_TYPE_KPROBEBPF_PROG_TYPE_LIRC_MODE2BPF_PROG_TYPE_LSMBPF_PROG_TYPE_LWT_INBPF_PROG_TYPE_LWT_OUTBPF_PROG_TYPE_LWT_SEG6LOCALBPF_PROG_TYPE_LWT_XMITBPF_PROG_TYPE_NETFILTERBPF_PROG_TYPE_PERF_EVENTBPF_PROG_TYPE_RAW_TRACEPOINTBPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLEBPF_PROG_TYPE_SCHED_ACTBPF_PROG_TYPE_SCHED_CLSBPF_PROG_TYPE_SK_LOOKUPBPF_PROG_TYPE_SK_MSGBPF_PROG_TYPE_SK_REUSEPORTBPF_PROG_TYPE_SK_SKBBPF_PROG_TYPE_SOCKET_FILTERBPF_PROG_TYPE_SOCK_OPSBPF_PROG_TYPE_STRUCT_OPSBPF_PROG_TYPE_SYSCALLBPF_PROG_TYPE_TRACEPOINTBPF_PROG_TYPE_TRACINGBPF_PROG_TYPE_XDP
Example
__u64 start_time = bpf_ktime_get_ns();
/* some tasks */
__u64 end_time = bpf_ktime_get_ns();
__u64 duration = end_time - start_time;