Class: RbBCC::PerfEventArray

Inherits:
TableBase show all
Defined in:
lib/rbbcc/table.rb

Instance Attribute Summary

Attributes inherited from TableBase

#bpf, #flags, #keysize, #keytype, #leafsize, #leaftype, #map_fd, #map_id, #name, #ttype

Instance Method Summary collapse

Methods inherited from TableBase

#[], #[]=, #clear, #delete, #each_key, #each_pair, #each_value, #fetch, #items, #next, #print_linear_hist, #print_log2_hist, #structured_key?, #values

Methods included from CPUHelper

_read_cpu_range, get_online_cpus, get_possible_cpus

Constructor Details

#initialize(bpf, map_id, map_fd, keytype, leaftype, name: nil) ⇒ PerfEventArray

Returns a new instance of PerfEventArray.



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# File 'lib/rbbcc/table.rb', line 263

def initialize(bpf, map_id, map_fd, keytype, leaftype, name: nil)
  super
  @open_key_fds = {}
  @event_class = nil
  @_cbs = {}
  @_open_key_fds = {}
end

Instance Method Details

#event(data) ⇒ Object 



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# File 'lib/rbbcc/table.rb', line 271

def event(data)
  @event_class ||= get_event_class
  ev = @event_class.malloc
  Fiddle::Pointer.new(ev.to_ptr)[0, @event_class.size] = data[0, @event_class.size]
  return ev
end

#open_perf_buffer(page_cnt: 8, lost_cb: nil, &callback) ⇒ Object 



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# File 'lib/rbbcc/table.rb', line 278

def open_perf_buffer(page_cnt: 8, lost_cb: nil, &callback)
  if page_cnt & (page_cnt - 1) != 0
    raise "Perf buffer page_cnt must be a power of two"
  end

  get_online_cpus.each do |i|
    _open_perf_buffer(i, callback, page_cnt, lost_cb)
  end
end