std::optional Senpai::getLimitMaxBytes()

in src/oomd/plugins/Senpai.cpp [417:447]

• 26 lines of code
• 6 McCabe index (conditional complexity)

std::optional<int64_t> Senpai::getLimitMaxBytes(
    const CgroupContext& cgroup_ctx) {
  auto memcurr_opt = cgroup_ctx.current_usage();
  if (!memcurr_opt) {
    return std::nullopt;
  }
  auto limit_max_bytes =
      std::min(host_mem_total_, limit_max_bytes_ + *memcurr_opt);

  // Don't let memory.high.tmp go above memory.high as kernel ignores the
  // latter when the former is set.
  auto has_memory_high_tmp_opt = hasMemoryHighTmp(cgroup_ctx);
  if (!has_memory_high_tmp_opt) {
    return std::nullopt;
  }
  if (*has_memory_high_tmp_opt) {
    auto memhigh_opt = cgroup_ctx.memory_high();
    if (!memhigh_opt) {
      return std::nullopt;
    }
    limit_max_bytes = std::min(limit_max_bytes, *memhigh_opt);
  }

  auto memmax_opt = cgroup_ctx.memory_max();
  if (!memmax_opt) {
    return std::nullopt;
  }
  limit_max_bytes = std::min(limit_max_bytes, *memmax_opt);

  return limit_max_bytes;
}