rocm-systems/include/rdc_lib/impl/RdcWatchTableImpl.h

/*
Copyright (c) 2020 - present Advanced Micro Devices, Inc. All rights reserved.

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*/
#ifndef INCLUDE_RDC_LIB_IMPL_RDCWATCHTABLEIMPL_H_
#define INCLUDE_RDC_LIB_IMPL_RDCWATCHTABLEIMPL_H_

#include <string>
#include <map>
#include <vector>
#include <utility>
#include <memory>
#include <mutex>  // NOLINT
#include <atomic>
#include <map>
#include "rdc_lib/RdcWatchTable.h"
#include "rdc_lib/RdcGroupSettings.h"
#include "rdc_lib/RdcCacheManager.h"
#include "rdc_lib/RdcMetricFetcher.h"
#include "rocm_smi/rocm_smi.h"

namespace amd {
namespace rdc {

//!< The settings for a field or a group of field in the watch table.
struct FieldSettings {
    uint64_t  update_freq;
    uint32_t  max_keep_samples;
    double  max_keep_age;
    bool is_watching;
    uint64_t last_update_time;
};

struct JobWatchTableEntry {
    uint32_t group_id;
    std::vector<RdcFieldKey> fields;  //< store fields for faster query
};


class RdcWatchTableImpl : public RdcWatchTable {
 public:
    rdc_status_t rdc_job_start_stats(rdc_gpu_group_t group_id,
                    const char job_id[64], uint64_t update_freq,
                    const rdc_gpu_gauges_t& gpu_gauge) override;
    rdc_status_t rdc_job_stop_stats(const char job_id[64],
                    const rdc_gpu_gauges_t& gpu_gauge) override;
    rdc_status_t rdc_job_remove(const char job_id[64]) override;
    rdc_status_t rdc_job_remove_all() override;

    rdc_status_t rdc_field_watch(rdc_gpu_group_t group_id,
        rdc_field_grp_t field_group_id, uint64_t update_freq,
        double  max_keep_age, uint32_t max_keep_samples) override;

    //!< rdc_field_unwatch() will not remove the entry from watch_table.
    //!< The unwatched entry is still kept until the max_keep_age of the entry
    //!< is reached, which will be handled in the clean_up() function.
    rdc_status_t rdc_field_unwatch(rdc_gpu_group_t group_id,
                rdc_field_grp_t field_group_id) override;

    //!< When the RDC is running as RDC_OPERATION_MODE_MANUAL, the user will
    //!< call this function periodically. Instead of providing other APIs to
    //!< cleanup the cache, this function will update and cleanup the cache.
    //!<
    //!< This function may be called very frequently, and the cache cleanup
    //!< is expensive. Internally, this function will throttle the cleanup to
    //!< once per second.
    rdc_status_t rdc_field_update_all() override;

    RdcWatchTableImpl(const RdcGroupSettingsPtr& group_settings,
        const RdcCacheManagerPtr& cache_mgr,
        const RdcMetricFetcherPtr& metric_fetcher);

 private:
    //!< Helper function to Update the fields_in_table when unwatch tables
    rdc_status_t update_field_in_table_when_unwatch(
                                               const RdcFieldGroupKey& entry);

    //!< Helper function to clean up the watch table and cache
    void clean_up();

    //!< Helper function for debug information in watch table and cache
    void debug_status();

    //!< Helper function to get the fields using the group and the field group.
    rdc_status_t get_fields_from_group(rdc_gpu_group_t group_id,
         rdc_field_grp_t field_group_id,
         std::vector<RdcFieldKey> & fields); // NOLINT

    bool is_job_watch_field(uint32_t gpu_index, rdc_field_t field_id,
                                        std::string& job_id) const;  // NOLINT

    rdc_status_t initialize_rsmi_handles(RdcFieldKey fk);

    RdcGroupSettingsPtr group_settings_;
    RdcCacheManagerPtr cache_mgr_;
    RdcMetricFetcherPtr metric_fetcher_;

    //!< The watch table to store the watch settings.
    std::map<RdcFieldGroupKey, FieldSettings> watch_table_;

    //!< <job_id, gpu_group_id> pairs
    std::map<std::string, JobWatchTableEntry> job_watch_table_;


    //!< The settings for each field can be deduced from watch_table. But every
    //!< rdc_field_update_all() call needs to deduce them. To improve the
    //!< performance, the fields_to_watch_ is used to track the field settings.
    //!< Those settings will only be updated when watching or unwatching.
    std::map<RdcFieldKey, FieldSettings> fields_to_watch_;

    //!< The last clean up time
    std::atomic<uint64_t> last_cleanup_time_;
    std::mutex watch_mutex_;
};

}  // namespace rdc
}  // namespace amd


#endif  // INCLUDE_RDC_LIB_IMPL_RDCWATCHTABLEIMPL_H_