perf_event.hpp

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// to you under the Apache License, Version 2.0 (the
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//
//     http://www.apache.org/licenses/LICENSE-2.0
//
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// See the License for the specific language governing permissions and
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#ifndef __CGROUPS_ISOLATOR_SUBSYSTEMS_PERF_EVENT_HPP__
#define __CGROUPS_ISOLATOR_SUBSYSTEMS_PERF_EVENT_HPP__

#include <set>
#include <string>

#include <mesos/resources.hpp>

#include <process/clock.hpp>
#include <process/future.hpp>
#include <process/owned.hpp>
#include <process/time.hpp>

#include <stout/hashmap.hpp>

#include "slave/flags.hpp"

#include "slave/containerizer/mesos/isolators/cgroups/constants.hpp"
#include "slave/containerizer/mesos/isolators/cgroups/subsystem.hpp"

namespace mesos {
namespace internal {
namespace slave {

class PerfEventSubsystem: public Subsystem
{
public:
  static Try<process::Owned<Subsystem>> create(
      const Flags& flags,
      const std::string& hierarchy);

  virtual ~PerfEventSubsystem() {}

  virtual std::string name() const
  {
    return CGROUP_SUBSYSTEM_PERF_EVENT_NAME;
  }

  virtual process::Future<Nothing> prepare(
      const ContainerID& containerId,
      const std::string& cgroup);

  virtual process::Future<Nothing> recover(
      const ContainerID& containerId,
      const std::string& cgroup);

  virtual process::Future<ResourceStatistics> usage(
      const ContainerID& containerId,
      const std::string& cgroup);

  virtual process::Future<Nothing> cleanup(
      const ContainerID& containerId,
      const std::string& cgroup);

protected:
  virtual void initialize();

private:
  PerfEventSubsystem(
      const Flags& flags,
      const std::string& hierarchy,
      const std::set<std::string>& events);

  struct Info
  {
    Info(const std::string& _cgroup)
      : cgroup(_cgroup)
    {
      // Ensure the initial statistics include the required fields.
      // Note the duration is set to zero to indicate no sampling has
      // taken place. This empty sample will be returned from usage()
      // until the first true sample is obtained.
      statistics.set_timestamp(process::Clock::now().secs());
      statistics.set_duration(Seconds(0).secs());
    }

    const std::string cgroup;
    PerfStatistics statistics;
  };

  void sample();

  void _sample(
      const process::Time& next,
      const process::Future<hashmap<std::string, PerfStatistics>>& statistics);

  // Set of events to sample.
  std::set<std::string> events;

  // Stores cgroups associated information for container.
  hashmap<ContainerID, process::Owned<Info>> infos;
};

} // namespace slave {
} // namespace internal {
} // namespace mesos {

#endif // __CGROUPS_ISOLATOR_SUBSYSTEMS_PERF_EVENT_HPP__