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authorAlexei Starovoitov <ast@plumgrid.com>2015-10-20 20:02:34 -0700
committerDavid S. Miller <davem@davemloft.net>2015-10-22 06:42:15 -0700
commita43eec304259a6c637f4014a6d4767159b6a3aa3 (patch)
treeaecaeb92ff5263f446b002793d89a2a211dc246b /samples
parentfa128e6a148a0a58355bd6814c6283515bbd028a (diff)
downloadlinux-a43eec304259a6c637f4014a6d4767159b6a3aa3.tar.bz2
bpf: introduce bpf_perf_event_output() helper
This helper is used to send raw data from eBPF program into special PERF_TYPE_SOFTWARE/PERF_COUNT_SW_BPF_OUTPUT perf_event. User space needs to perf_event_open() it (either for one or all cpus) and store FD into perf_event_array (similar to bpf_perf_event_read() helper) before eBPF program can send data into it. Today the programs triggered by kprobe collect the data and either store it into the maps or print it via bpf_trace_printk() where latter is the debug facility and not suitable to stream the data. This new helper replaces such bpf_trace_printk() usage and allows programs to have dedicated channel into user space for post-processing of the raw data collected. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'samples')
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