dirty counter added. NO increamenting yet

2 files changed, 19 insertions, 11 deletions

diff --git a/src/gpgpu-sim/gpu-cache.cc b/src/gpgpu-sim/gpu-cache.cc
index 1c36d22..763705f 100644
--- a/src/gpgpu-sim/gpu-cache.cc
+++ b/src/gpgpu-sim/gpu-cache.cc
@@ -284,15 +284,20 @@ enum cache_request_status tag_array::probe(new_addr_type addr, unsigned &idx,
         invalid_line = index;
       } else {
         // valid line : keep track of most appropriate replacement candidate
-        if (m_config.m_replacement_policy == LRU) {
-          if (line->get_last_access_time() < valid_timestamp) {
-            valid_timestamp = line->get_last_access_time();
-            valid_line = index;
-          }
-        } else if (m_config.m_replacement_policy == FIFO) {
-          if (line->get_alloc_time() < valid_timestamp) {
-            valid_timestamp = line->get_alloc_time();
-            valid_line = index;
+        if (!line->get_status(mask) == MODIFIED || 
+            100 * m_dirty/(m_config.m_nset * m_config.m_assoc) >= m_config.m_wr_percent) {
+              // don't evict write until dirty lines reach threshold
+              // make sure at least 1 candidate is assigned
+          if (m_config.m_replacement_policy == LRU) {
+            if (line->get_last_access_time() < valid_timestamp) {
+              valid_timestamp = line->get_last_access_time();
+              valid_line = index;
+            }
+          } else if (m_config.m_replacement_policy == FIFO) {
+            if (line->get_alloc_time() < valid_timestamp) {
+              valid_timestamp = line->get_alloc_time();
+              valid_line = index;
+            }
           }
         }
       }
@@ -418,6 +423,7 @@ void tag_array::flush() {
     if (m_lines[i]->is_modified_line()) {
       for (unsigned j = 0; j < SECTOR_CHUNCK_SIZE; j++)
         m_lines[i]->set_status(INVALID, mem_access_sector_mask_t().set(j));
+        m_dirty--;
     }
 
   is_used = false;
diff --git a/src/gpgpu-sim/gpu-cache.h b/src/gpgpu-sim/gpu-cache.h
index 00c09ae..9dbfe82 100644
--- a/src/gpgpu-sim/gpu-cache.h
+++ b/src/gpgpu-sim/gpu-cache.h
@@ -498,10 +498,10 @@ class cache_config {
     char ct, rp, wp, ap, mshr_type, wap, sif;
 
     int ntok =
-        sscanf(config, "%c:%u:%u:%u,%c:%c:%c:%c:%c,%c:%u:%u,%u:%u,%u", &ct,
+        sscanf(config, "%c:%u:%u:%u,%c:%c:%c:%c:%c,%c:%u:%u,%u:%u,%u,%u", &ct,
                &m_nset, &m_line_sz, &m_assoc, &rp, &wp, &ap, &wap, &sif,
                &mshr_type, &m_mshr_entries, &m_mshr_max_merge,
-               &m_miss_queue_size, &m_result_fifo_entries, &m_data_port_width);
+               &m_miss_queue_size, &m_result_fifo_entries, &m_data_port_width, &m_wr_percent);
 
     if (ntok < 12) {
       if (!strcmp(config, "none")) {
@@ -801,6 +801,7 @@ class cache_config {
   unsigned m_data_port_width;  //< number of byte the cache can access per cycle
   enum set_index_function
       m_set_index_function;  // Hash, linear, or custom set index function
+  unsigned m_wr_percent;
 
   friend class tag_array;
   friend class baseline_cache;
@@ -897,6 +898,7 @@ class tag_array {
                            // allocated but not filled
   unsigned m_res_fail;
   unsigned m_sector_miss;
+  unsigned m_dirty;
 
   // performance counters for calculating the amount of misses within a time
   // window