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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 /samples/bpf | |
parent | 1c601d829ab0d7ac3ac44853f83db2206afe67fc (diff) |
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 'samples/bpf')
0 files changed, 0 insertions, 0 deletions