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author | Jesper Dangaard Brouer <brouer@redhat.com> | 2017-10-16 12:19:44 +0200 |
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committer | David S. Miller <davem@davemloft.net> | 2017-10-18 12:12:18 +0100 |
commit | f9419f7bd7a5318b636a941a0214c5cdfa6f6530 (patch) | |
tree | 20eed724e856cfae290ed8b3730c6b2a9af819ea /include/trace/events/xdp.h | |
parent | 1c601d829ab0d7ac3ac44853f83db2206afe67fc (diff) | |
download | linux-f9419f7bd7a5318b636a941a0214c5cdfa6f6530.tar.gz linux-f9419f7bd7a5318b636a941a0214c5cdfa6f6530.tar.bz2 linux-f9419f7bd7a5318b636a941a0214c5cdfa6f6530.zip |
bpf: cpumap add tracepoints
This adds two tracepoint to the cpumap. One for the enqueue side
trace_xdp_cpumap_enqueue() and one for the kthread dequeue side
trace_xdp_cpumap_kthread().
To mitigate the tracepoint overhead, these are invoked during the
enqueue/dequeue bulking phases, thus amortizing the cost.
The obvious use-cases are for debugging and monitoring. The
non-intuitive use-case is using these as a feedback loop to know the
system load. One can imagine auto-scaling by reducing, adding or
activating more worker CPUs on demand.
V4: tracepoint remove time_limit info, instead add sched info
V8: intro struct bpf_cpu_map_entry members cpu+map_id in this patch
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/trace/events/xdp.h')
-rw-r--r-- | include/trace/events/xdp.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h index eb2ece96c1a2..0c8dec61987e 100644 --- a/include/trace/events/xdp.h +++ b/include/trace/events/xdp.h @@ -150,6 +150,76 @@ DEFINE_EVENT_PRINT(xdp_redirect_template, xdp_redirect_map_err, trace_xdp_redirect_map_err(dev, xdp, devmap_ifindex(fwd, map), \ err, map, idx) +TRACE_EVENT(xdp_cpumap_kthread, + + TP_PROTO(int map_id, unsigned int processed, unsigned int drops, + int sched), + + TP_ARGS(map_id, processed, drops, sched), + + TP_STRUCT__entry( + __field(int, map_id) + __field(u32, act) + __field(int, cpu) + __field(unsigned int, drops) + __field(unsigned int, processed) + __field(int, sched) + ), + + TP_fast_assign( + __entry->map_id = map_id; + __entry->act = XDP_REDIRECT; + __entry->cpu = smp_processor_id(); + __entry->drops = drops; + __entry->processed = processed; + __entry->sched = sched; + ), + + TP_printk("kthread" + " cpu=%d map_id=%d action=%s" + " processed=%u drops=%u" + " sched=%d", + __entry->cpu, __entry->map_id, + __print_symbolic(__entry->act, __XDP_ACT_SYM_TAB), + __entry->processed, __entry->drops, + __entry->sched) +); + +TRACE_EVENT(xdp_cpumap_enqueue, + + TP_PROTO(int map_id, unsigned int processed, unsigned int drops, + int to_cpu), + + TP_ARGS(map_id, processed, drops, to_cpu), + + TP_STRUCT__entry( + __field(int, map_id) + __field(u32, act) + __field(int, cpu) + __field(unsigned int, drops) + __field(unsigned int, processed) + __field(int, to_cpu) + ), + + TP_fast_assign( + __entry->map_id = map_id; + __entry->act = XDP_REDIRECT; + __entry->cpu = smp_processor_id(); + __entry->drops = drops; + __entry->processed = processed; + __entry->to_cpu = to_cpu; + ), + + TP_printk("enqueue" + " cpu=%d map_id=%d action=%s" + " processed=%u drops=%u" + " to_cpu=%d", + __entry->cpu, __entry->map_id, + __print_symbolic(__entry->act, __XDP_ACT_SYM_TAB), + __entry->processed, __entry->drops, + __entry->to_cpu) +); + #endif /* _TRACE_XDP_H */ #include <trace/define_trace.h> |