refactored sf result resetting to avoid realloc of memory

srsenb/hdr/stack/mac/sched.h

@@ -97,11 +97,11 @@ protected:
   std::vector<std::unique_ptr<carrier_sched> > carrier_schedulers;
 
   // Storage of past scheduling results
-  sched_result_list sched_results;
+  sched_result_ringbuffer sched_results;
 
   srslte::tti_point last_tti;
   std::mutex        sched_mutex;
-  std::atomic<bool> configured;
+  bool              configured;
 };
 
 } // namespace srsenb

srsenb/hdr/stack/mac/sched_carrier.h

@@ -28,7 +28,7 @@ public:
   explicit carrier_sched(rrc_interface_mac*                              rrc_,
                          std::map<uint16_t, std::unique_ptr<sched_ue> >* ue_db_,
                          uint32_t                                        enb_cc_idx_,
-                         sched_result_list*                              sched_results_);
+                         sched_result_ringbuffer*                        sched_results_);
   ~carrier_sched();
   void                   reset();
   void                   carrier_cfg(const sched_cell_params_t& sched_params_);
@@ -57,10 +57,10 @@ private:
   const uint32_t                                  enb_cc_idx;
 
   // Subframe scheduling logic
-  std::array<sf_sched, TTIMOD_SZ> sf_scheds;
+  srslte::circular_array<sf_sched, TTIMOD_SZ> sf_scheds;
 
   // scheduling results
-  sched_result_list* prev_sched_results;
+  sched_result_ringbuffer* prev_sched_results;
 
   std::vector<uint8_t> sf_dl_mask; ///< Some TTIs may be forbidden for DL sched due to MBMS
 

srsenb/hdr/stack/mac/sched_grid.h

@@ -17,6 +17,7 @@
 #include "sched_phy_ch/sf_cch_allocator.h"
 #include "sched_ue.h"
 #include "srslte/adt/bounded_bitset.h"
+#include "srslte/adt/circular_array.h"
 #include "srslte/srslog/srslog.h"
 #include <deque>
 #include <vector>
@@ -50,43 +51,61 @@ struct alloc_outcome_t {
 
 //! Result of a Subframe sched computation
 struct cc_sched_result {
-  tti_point                       tti_rx;
-  sched_interface::dl_sched_res_t dl_sched_result = {};
-  sched_interface::ul_sched_res_t ul_sched_result = {};
+  bool                            generated       = false;
   rbgmask_t                       dl_mask         = {}; ///< Accumulation of all DL RBG allocations
   prbmask_t                       ul_mask         = {}; ///< Accumulation of all UL PRB allocations
   pdcch_mask_t                    pdcch_mask      = {}; ///< Accumulation of all CCE allocations
-
-  bool is_generated(tti_point tti_rx_) const { return tti_rx == tti_rx_; }
+  sched_interface::dl_sched_res_t dl_sched_result = {};
+  sched_interface::ul_sched_res_t ul_sched_result = {};
 };
 
 struct sf_sched_result {
-  srslte::tti_point            tti_rx;
+  tti_point                    tti_rx;
   std::vector<cc_sched_result> enb_cc_list;
 
-  cc_sched_result*       new_cc(uint32_t enb_cc_idx);
+  void new_tti(tti_point tti_rx);
+  bool is_generated(uint32_t enb_cc_idx) const
+  {
+    return enb_cc_list.size() > enb_cc_idx and enb_cc_list[enb_cc_idx].generated;
+  }
   const cc_sched_result* get_cc(uint32_t enb_cc_idx) const
   {
-    return enb_cc_idx < enb_cc_list.size() ? &enb_cc_list[enb_cc_idx] : nullptr;
+    assert(enb_cc_idx < enb_cc_list.size());
+    return &enb_cc_list[enb_cc_idx];
   }
   cc_sched_result* get_cc(uint32_t enb_cc_idx)
   {
-    return enb_cc_idx < enb_cc_list.size() ? &enb_cc_list[enb_cc_idx] : nullptr;
+    assert(enb_cc_idx < enb_cc_list.size());
+    return &enb_cc_list[enb_cc_idx];
   }
   bool is_ul_alloc(uint16_t rnti) const;
   bool is_dl_alloc(uint16_t rnti) const;
 };
 
-struct sched_result_list {
+struct sched_result_ringbuffer {
 public:
-  sf_sched_result*       new_tti(srslte::tti_point tti_rx);
-  sf_sched_result*       get_sf(srslte::tti_point tti_rx);
-  const sf_sched_result* get_sf(srslte::tti_point tti_rx) const;
-  const cc_sched_result* get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx) const;
-  cc_sched_result*       get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx);
+  void             set_nof_carriers(uint32_t nof_carriers);
+  void             new_tti(srslte::tti_point tti_rx);
+  bool             has_sf(srslte::tti_point tti_rx) const { return results[tti_rx.to_uint()].tti_rx == tti_rx; }
+  sf_sched_result* get_sf(srslte::tti_point tti_rx)
+  {
+    assert(has_sf(tti_rx));
+    return &results[tti_rx.to_uint()];
+  }
+  const sf_sched_result* get_sf(srslte::tti_point tti_rx) const
+  {
+    assert(has_sf(tti_rx));
+    return &results[tti_rx.to_uint()];
+  }
+  const cc_sched_result* get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx) const
+  {
+    return get_sf(tti_rx)->get_cc(enb_cc_idx);
+  }
+  cc_sched_result* get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx) { return get_sf(tti_rx)->get_cc(enb_cc_idx); }
 
 private:
-  std::array<sf_sched_result, TTIMOD_SZ> results;
+  uint32_t                                           nof_carriers = 1;
+  srslte::circular_array<sf_sched_result, TTIMOD_SZ> results;
 };
 
 /// manages a subframe grid resources, namely CCE and DL/UL RB allocations
@@ -205,7 +224,7 @@ public:
   alloc_outcome_t
        alloc_ul(sched_ue* user, prb_interval alloc, ul_alloc_t::type_t alloc_type, bool is_msg3 = false, int msg3_mcs = -1);
   bool reserve_ul_prbs(const prbmask_t& ulmask, bool strict) { return tti_alloc.reserve_ul_prbs(ulmask, strict); }
-  bool alloc_phich(sched_ue* user, sched_interface::ul_sched_res_t* ul_sf_result);
+  bool alloc_phich(sched_ue* user);
 
   // compute DCIs and generate dl_sched_result/ul_sched_result for a given TTI
   void generate_sched_results(sched_ue_list& ue_db);

srsenb/src/stack/mac/sched.cc

@@ -68,6 +68,8 @@ int sched::cell_cfg(const std::vector<sched_interface::cell_cfg_t>& cell_cfg)
     }
   }
 
+  sched_results.set_nof_carriers(cell_cfg.size());
+
   // Create remaining cells, if not created yet
   uint32_t prev_size = carrier_schedulers.size();
   carrier_schedulers.resize(sched_cell_params.size());
@@ -80,7 +82,7 @@ int sched::cell_cfg(const std::vector<sched_interface::cell_cfg_t>& cell_cfg)
     carrier_schedulers[i]->carrier_cfg(sched_cell_params[i]);
   }
 
-  configured.store(true, std::memory_order_release);
+  configured = true;
   return 0;
 }
 
@@ -287,11 +289,10 @@ std::array<bool, SRSLTE_MAX_CARRIERS> sched::get_scell_activation_mask(uint16_t
 // Downlink Scheduler API
 int sched::dl_sched(uint32_t tti_tx_dl, uint32_t enb_cc_idx, sched_interface::dl_sched_res_t& sched_result)
 {
-  if (not configured.load(std::memory_order_acquire)) {
+  std::lock_guard<std::mutex> lock(sched_mutex);
+  if (not configured) {
     return 0;
   }
-
-  std::lock_guard<std::mutex> lock(sched_mutex);
   if (enb_cc_idx >= carrier_schedulers.size()) {
     return 0;
   }
@@ -308,11 +309,10 @@ int sched::dl_sched(uint32_t tti_tx_dl, uint32_t enb_cc_idx, sched_interface::dl
 // Uplink Scheduler API
 int sched::ul_sched(uint32_t tti, uint32_t enb_cc_idx, srsenb::sched_interface::ul_sched_res_t& sched_result)
 {
-  if (not configured.load(std::memory_order_acquire)) {
+  std::lock_guard<std::mutex> lock(sched_mutex);
+  if (not configured) {
     return 0;
   }
-
-  std::lock_guard<std::mutex> lock(sched_mutex);
   if (enb_cc_idx >= carrier_schedulers.size()) {
     return 0;
   }
@@ -346,9 +346,7 @@ void sched::new_tti(tti_point tti_rx)
 /// Check if TTI result is generated
 bool sched::is_generated(srslte::tti_point tti_rx, uint32_t enb_cc_idx) const
 {
-  const sf_sched_result* sf_result = sched_results.get_sf(tti_rx);
-  return sf_result != nullptr and sf_result->get_cc(enb_cc_idx) != nullptr and
-         sf_result->get_cc(enb_cc_idx)->is_generated(tti_rx);
+  return sched_results.has_sf(tti_rx) and sched_results.get_sf(tti_rx)->is_generated(enb_cc_idx);
 }
 
 // Common way to access ue_db elements in a read locking way

srsenb/src/stack/mac/sched_carrier.cc

@@ -325,7 +325,7 @@ void ra_sched::reset()
 sched::carrier_sched::carrier_sched(rrc_interface_mac*       rrc_,
                                     sched_ue_list*           ue_db_,
                                     uint32_t                 enb_cc_idx_,
-                                    sched_result_list* sched_results_) :
+                                    sched_result_ringbuffer* sched_results_) :
   rrc(rrc_),
   ue_db(ue_db_),
   logger(srslog::fetch_basic_logger("MAC")),
@@ -376,7 +376,7 @@ const cc_sched_result& sched::carrier_sched::generate_tti_result(tti_point tti_r
 {
   sf_sched*        tti_sched = get_sf_sched(tti_rx);
   sf_sched_result* sf_result = prev_sched_results->get_sf(tti_rx);
-  cc_sched_result* cc_result = sf_result->new_cc(enb_cc_idx);
+  cc_sched_result* cc_result = sf_result->get_cc(enb_cc_idx);
 
   bool dl_active = sf_dl_mask[tti_sched->get_tti_tx_dl().to_uint() % sf_dl_mask.size()] == 0;
 
@@ -390,7 +390,7 @@ const cc_sched_result& sched::carrier_sched::generate_tti_result(tti_point tti_r
     if (cc_result->ul_sched_result.nof_phich_elems >= MAX_PHICH_LIST) {
       break;
     }
-    tti_sched->alloc_phich(ue_pair.second.get(), &cc_result->ul_sched_result);
+    tti_sched->alloc_phich(ue_pair.second.get());
   }
 
   /* Schedule DL control data */
@@ -460,13 +460,13 @@ int sched::carrier_sched::alloc_ul_users(sf_sched* tti_sched)
 
 sf_sched* sched::carrier_sched::get_sf_sched(tti_point tti_rx)
 {
-  sf_sched* ret = &sf_scheds[tti_rx.to_uint() % sf_scheds.size()];
+  sf_sched* ret = &sf_scheds[tti_rx.to_uint()];
   if (ret->get_tti_rx() != tti_rx) {
-    sf_sched_result* sf_res = prev_sched_results->get_sf(tti_rx);
-    if (sf_res == nullptr) {
+    if (not prev_sched_results->has_sf(tti_rx)) {
       // Reset if tti_rx has not been yet set in the sched results
-      sf_res = prev_sched_results->new_tti(tti_rx);
+      prev_sched_results->new_tti(tti_rx);
     }
+    sf_sched_result* sf_res = prev_sched_results->get_sf(tti_rx);
     // start new TTI for the given CC.
     ret->new_tti(tti_rx, sf_res);
   }

srsenb/src/stack/mac/sched_grid.cc

@@ -51,12 +51,13 @@ const char* alloc_outcome_t::to_string() const
   return "unknown error";
 }
 
-cc_sched_result* sf_sched_result::new_cc(uint32_t enb_cc_idx)
+void sf_sched_result::new_tti(tti_point tti_rx_)
 {
-  if (enb_cc_idx >= enb_cc_list.size()) {
-    enb_cc_list.resize(enb_cc_idx + 1);
+  assert(tti_rx != tti_rx_);
+  tti_rx = tti_rx_;
+  for (auto& cc : enb_cc_list) {
+    cc = {};
   }
-  return &enb_cc_list[enb_cc_idx];
 }
 
 bool sf_sched_result::is_ul_alloc(uint16_t rnti) const
@@ -82,36 +83,18 @@ bool sf_sched_result::is_dl_alloc(uint16_t rnti) const
   return false;
 }
 
-sf_sched_result* sched_result_list::new_tti(srslte::tti_point tti_rx)
-{
-  sf_sched_result* res = &results[tti_rx.to_uint() % results.size()];
-  res->tti_rx          = tti_rx;
-  res->enb_cc_list.clear();
-  return res;
-}
-
-sf_sched_result* sched_result_list::get_sf(srslte::tti_point tti_rx)
-{
-  sf_sched_result* res = &results[tti_rx.to_uint() % results.size()];
-  return (res->tti_rx != tti_rx) ? nullptr : res;
-}
-
-const sf_sched_result* sched_result_list::get_sf(srslte::tti_point tti_rx) const
+void sched_result_ringbuffer::set_nof_carriers(uint32_t nof_carriers_)
 {
-  const sf_sched_result* res = &results[tti_rx.to_uint() % results.size()];
-  return (res->tti_rx != tti_rx) ? nullptr : res;
+  nof_carriers = nof_carriers_;
+  for (auto& sf_res : results) {
+    sf_res.enb_cc_list.resize(nof_carriers_);
   }
-
-const cc_sched_result* sched_result_list::get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx) const
-{
-  const sf_sched_result* res = get_sf(tti_rx);
-  return res != nullptr ? res->get_cc(enb_cc_idx) : nullptr;
 }
 
-cc_sched_result* sched_result_list::get_cc(srslte::tti_point tti_rx, uint32_t enb_cc_idx)
+void sched_result_ringbuffer::new_tti(srslte::tti_point tti_rx)
 {
-  sf_sched_result* res = get_sf(tti_rx);
-  return res != nullptr ? res->get_cc(enb_cc_idx) : nullptr;
+  sf_sched_result* res = &results[tti_rx.to_uint()];
+  res->new_tti(tti_rx);
 }
 
 /*******************************************************
@@ -634,14 +617,16 @@ alloc_outcome_t sf_sched::alloc_ul_user(sched_ue* user, prb_interval alloc)
   return alloc_ul(user, alloc, alloc_type, h->is_msg3());
 }
 
-bool sf_sched::alloc_phich(sched_ue* user, sched_interface::ul_sched_res_t* ul_sf_result)
+bool sf_sched::alloc_phich(sched_ue* user)
 {
+  using phich_t = sched_interface::ul_sched_phich_t;
+
+  auto* ul_sf_result = &cc_results->get_cc(cc_cfg->enb_cc_idx)->ul_sched_result;
   if (ul_sf_result->nof_phich_elems >= sched_interface::MAX_PHICH_LIST) {
     logger.warning("SCHED: Maximum number of PHICH allocations has been reached");
     return false;
   }
-  using phich_t    = sched_interface::ul_sched_phich_t;
-  auto& phich_list = ul_sf_result->phich[ul_sf_result->nof_phich_elems];
+  phich_t& phich_item = ul_sf_result->phich[ul_sf_result->nof_phich_elems];
 
   auto p = user->get_active_cell_index(cc_cfg->enb_cc_idx);
   if (not p.first) {
@@ -653,8 +638,8 @@ bool sf_sched::alloc_phich(sched_ue* user, sched_interface::ul_sched_res_t* ul_s
 
   /* Indicate PHICH acknowledgment if needed */
   if (h->has_pending_phich()) {
-    phich_list.phich = h->pop_pending_phich() ? phich_t::ACK : phich_t::NACK;
-    phich_list.rnti  = user->get_rnti();
+    phich_item.phich = h->pop_pending_phich() ? phich_t::ACK : phich_t::NACK;
+    phich_item.rnti  = user->get_rnti();
     ul_sf_result->nof_phich_elems++;
     return true;
   }
@@ -970,7 +955,7 @@ void sf_sched::generate_sched_results(sched_ue_list& ue_db)
   /* Store remaining sf_sched results for this TTI */
   cc_result->dl_mask   = tti_alloc.get_dl_mask();
   cc_result->ul_mask   = tti_alloc.get_ul_mask();
-  cc_result->tti_rx  = get_tti_rx();
+  cc_result->generated = true;
 }
 
 uint32_t sf_sched::get_nof_ctrl_symbols() const

srsenb/test/mac/sched_test_rand.cc

@@ -139,7 +139,6 @@ int sched_tester::process_results()
 {
   const srsenb::cc_sched_result* cc_result = sched_results.get_cc(tti_rx, CARRIER_IDX);
   srsenb::sf_output_res_t        sf_out{sched_cell_params, tti_rx, tti_info.ul_sched_result, tti_info.dl_sched_result};
-  TESTASSERT(tti_rx == cc_result->tti_rx);
 
   // Common tests
   TESTASSERT(test_pdcch_collisions(sf_out, CARRIER_IDX, &cc_result->pdcch_mask) == SRSLTE_SUCCESS);