Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> writes: > On Wed, Jun 26, 2019 at 4:55 AM Toke Høiland-Jørgensen <toke@xxxxxxxxxx> wrote: >> >> Andrii Nakryiko <andriin@xxxxxx> writes: >> >> > This patchset adds a high-level API for setting up and polling perf buffers >> > associated with BPF_MAP_TYPE_PERF_EVENT_ARRAY map. Details of APIs are >> > described in corresponding commit. >> > >> > Patch #1 adds a set of APIs to set up and work with perf buffer. >> > Patch #2 enhances libbpf to supprot auto-setting PERF_EVENT_ARRAY map size. >> > Patch #3 adds test. >> >> Having this in libbpf is great! Do you have a usage example of how a >> program is supposed to read events from the buffer? This is something we >> would probably want to add to the XDP tutorial > > Did you check patch #3 with selftest? It's essentially an end-to-end > example of how to set everything up and process data (in my case it's > just simple int being sent as a sample, but it's exactly the same with > more complicated structs). I didn't bother to handle lost samples > notification, but it's just another optional callback with a single > counter denoting how many samples were dropped. > > Let me know if it's still unclear. I did read the example, but I obviously did not grok how it was supposed to work; re-reading it now it's quite clear, thanks! :) -Toke
