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#
# Author:: Davide Cavalca <dcavalca@fb.com>
# Copyright:: Copyright (c) 2020 Facebook
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
Ohai.plugin(:Interrupts) do
depends "cpu"
provides "interrupts", "interrupts/irq", "interrupts/smp_affinity_by_cpu"
optional true
# Documentation: https://www.kernel.org/doc/Documentation/IRQ-affinity.txt
# format: comma-separate list of 32bit bitmask in hex
# each bit is a CPU, right to left ordering (i.e. CPU0 is rightmost)
def parse_smp_affinity(path, cpus)
masks = File.read(path).strip
bit_masks = []
masks.split(",").each do |mask|
bit_masks << mask.rjust(8, "0").to_i(16).to_s(2)
end
affinity_mask = bit_masks.join
affinity_by_cpu = affinity_mask.split("").reverse
smp_affinity_by_cpu = Mash.new
(0..cpus - 1).each do |cpu|
smp_affinity_by_cpu[cpu] = affinity_by_cpu[cpu].to_i == 1
end
smp_affinity_by_cpu
end
collect_data(:linux) do
interrupts Mash.new
cpus = cpu["total"]
interrupts[:smp_affinity_by_cpu] =
parse_smp_affinity("/proc/irq/default_smp_affinity", cpus)
interrupts[:irq] = Mash.new
File.open("/proc/interrupts").each do |line|
# Documentation: https://www.kernel.org/doc/Documentation/filesystems/proc.txt
# format is "{irqn}: {CPUn...} [type] [vector] [device]"
irqn, fields = line.split(":", 2)
# skip the header
next if fields.nil?
irqn.strip!
Ohai::Log.debug("irq: processing #{irqn}")
interrupts[:irq][irqn] = Mash.new
interrupts[:irq][irqn][:events_by_cpu] = Mash.new
fields = fields.split(nil, cpus + 1)
(0..cpus - 1).each do |cpu|
interrupts[:irq][irqn][:events_by_cpu][cpu] = fields[cpu].to_i
end
# Only regular IRQs have extra fields and affinity settings
if /^\d+$/.match(irqn)
interrupts[:irq][irqn][:type],
interrupts[:irq][irqn][:vector],
interrupts[:irq][irqn][:device] =
fields[cpus].split
if File.exist?("/proc/irq/#{irqn}/smp_affinity")
interrupts[:irq][irqn][:smp_affinity_by_cpu] =
parse_smp_affinity("/proc/irq/#{irqn}/smp_affinity", cpus)
end
# ERR and MIS do not have any extra fields
elsif fields[cpus]
interrupts[:irq][irqn][:type] = fields[cpus].strip
end
end
end
end
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