o3: fix tick used for renaming and issue with range selection

Fixes the tick used from rename:
- previously this gathered the tick on leaving rename which was always 1 less
  than the dispatch. This conflated the decode ticks when back pressure built
  in the pipeline.
- now picks up tick on entry.

Added --store_completions flag:
- will additionally display the store completion tail in the viewer.
- this highlights periods when large numbers of stores are outstanding (>16 LSQ
  blocking)

Allows selection by tick range (previously this caused an infinite loop)

src/cpu/o3/commit_impl.hh

@@ -60,6 +60,7 @@
 #include "debug/CommitRate.hh"
 #include "debug/Drain.hh"
 #include "debug/ExecFaulting.hh"
+#include "debug/O3PipeView.hh"
 #include "params/DerivO3CPU.hh"
 #include "sim/faults.hh"
 #include "sim/full_system.hh"
@@ -1267,7 +1268,9 @@ DefaultCommit<Impl>::commitHead(DynInstPtr &head_inst, unsigned inst_num)
     rob->retireHead(tid);
 
 #if TRACING_ON
+    if (DTRACE(O3PipeView)) {
         head_inst->commitTick = curTick() - head_inst->fetchTick;
+    }
 #endif
 
     // If this was a store, record it for this cycle.

src/cpu/o3/decode_impl.hh

@@ -47,6 +47,7 @@
 #include "cpu/inst_seq.hh"
 #include "debug/Activity.hh"
 #include "debug/Decode.hh"
+#include "debug/O3PipeView.hh"
 #include "params/DerivO3CPU.hh"
 #include "sim/full_system.hh"
 
@@ -714,7 +715,9 @@ DefaultDecode<Impl>::decodeInsts(ThreadID tid)
         --insts_available;
 
 #if TRACING_ON
+        if (DTRACE(O3PipeView)) {
             inst->decodeTick = curTick() - inst->fetchTick;
+        }
 #endif
 
         // Ensure that if it was predicted as a branch, it really is a

src/cpu/o3/dyn_inst.hh

@@ -132,6 +132,7 @@ class BaseO3DynInst : public BaseDynInst<Impl>
     int32_t issueTick;
     int32_t completeTick;
     int32_t commitTick;
+    int32_t storeTick;
 #endif
 
     /** Reads a misc. register, including any side-effects the read

src/cpu/o3/dyn_inst_impl.hh

@@ -66,7 +66,11 @@ BaseO3DynInst<Impl>::BaseO3DynInst(StaticInstPtr _staticInst,
 template <class Impl>BaseO3DynInst<Impl>::~BaseO3DynInst()
 {
 #if TRACING_ON
-    Tick val, fetch = this->fetchTick;
+    if (DTRACE(O3PipeView)) {
+        Tick fetch = this->fetchTick;
+        // fetchTick can be -1 if the instruction fetched outside the trace window.
+        if (fetch != -1) {
+            Tick val;
             // Print info needed by the pipeline activity viewer.
             DPRINTFR(O3PipeView, "O3PipeView:fetch:%llu:0x%08llx:%d:%llu:%s\n",
                      fetch,
@@ -74,6 +78,7 @@ template <class Impl>BaseO3DynInst<Impl>::~BaseO3DynInst()
                      this->microPC(),
                      this->seqNum,
                      this->staticInst->disassemble(this->instAddr()));
+
             val = (this->decodeTick == -1) ? 0 : fetch + this->decodeTick;
             DPRINTFR(O3PipeView, "O3PipeView:decode:%llu\n", val);
             val = (this->renameTick == -1) ? 0 : fetch + this->renameTick;
@@ -85,7 +90,11 @@ template <class Impl>BaseO3DynInst<Impl>::~BaseO3DynInst()
             val = (this->completeTick == -1) ? 0 : fetch + this->completeTick;
             DPRINTFR(O3PipeView, "O3PipeView:complete:%llu\n", val);
             val = (this->commitTick == -1) ? 0 : fetch + this->commitTick;
-    DPRINTFR(O3PipeView, "O3PipeView:retire:%llu\n", val);
+
+            Tick valS = (this->storeTick == -1) ? 0 : fetch + this->storeTick;
+            DPRINTFR(O3PipeView, "O3PipeView:retire:%llu:store:%llu\n", val, valS);
+        }
+    }
 #endif
 };
 
@@ -119,6 +128,7 @@ BaseO3DynInst<Impl>::initVars()
     issueTick = -1;
     completeTick = -1;
     commitTick = -1;
+    storeTick = -1;
 #endif
 }
 

src/cpu/o3/fetch_impl.hh

@@ -60,6 +60,7 @@
 #include "debug/Activity.hh"
 #include "debug/Drain.hh"
 #include "debug/Fetch.hh"
+#include "debug/O3PipeView.hh"
 #include "mem/packet.hh"
 #include "params/DerivO3CPU.hh"
 #include "sim/byteswap.hh"
@@ -1313,7 +1314,9 @@ DefaultFetch<Impl>::fetch(bool &status_change)
             numInst++;
 
 #if TRACING_ON
+            if (DTRACE(O3PipeView)) {
                 instruction->fetchTick = curTick();
+            }
 #endif
 
             nextPC = thisPC;

src/cpu/o3/iew_impl.hh

@@ -56,6 +56,7 @@
 #include "debug/Decode.hh"
 #include "debug/Drain.hh"
 #include "debug/IEW.hh"
+#include "debug/O3PipeView.hh"
 #include "params/DerivO3CPU.hh"
 
 using namespace std;
@@ -1611,7 +1612,9 @@ DefaultIEW<Impl>::updateExeInstStats(DynInstPtr &inst)
     iewExecutedInsts++;
 
 #if TRACING_ON
+    if (DTRACE(O3PipeView)) {
         inst->completeTick = curTick() - inst->fetchTick;
+    }
 #endif
 
     //

src/cpu/o3/lsq_unit_impl.hh

@@ -51,6 +51,7 @@
 #include "debug/Activity.hh"
 #include "debug/IEW.hh"
 #include "debug/LSQUnit.hh"
+#include "debug/O3PipeView.hh"
 #include "mem/packet.hh"
 #include "mem/request.hh"
 
@@ -1137,6 +1138,13 @@ LSQUnit<Impl>::completeStore(int store_idx)
             "idx:%i\n",
             storeQueue[store_idx].inst->seqNum, store_idx, storeHead);
 
+#if TRACING_ON
+    if (DTRACE(O3PipeView)) {
+        storeQueue[store_idx].inst->storeTick =
+            curTick() - storeQueue[store_idx].inst->fetchTick;
+    }
+#endif
+
     if (isStalled() &&
         storeQueue[store_idx].inst->seqNum == stallingStoreIsn) {
         DPRINTF(LSQUnit, "Unstalling, stalling store [sn:%lli] "

src/cpu/o3/rename_impl.hh

@@ -49,6 +49,7 @@
 #include "cpu/o3/rename.hh"
 #include "debug/Activity.hh"
 #include "debug/Rename.hh"
+#include "debug/O3PipeView.hh"
 #include "params/DerivO3CPU.hh"
 
 using namespace std;
@@ -658,9 +659,6 @@ DefaultRename<Impl>::renameInsts(ThreadID tid)
 
         ++renamed_insts;
 
-#if TRACING_ON
-        inst->renameTick = curTick() - inst->fetchTick;
-#endif
 
         // Put instruction in rename queue.
         toIEW->insts[toIEWIndex] = inst;
@@ -736,6 +734,11 @@ DefaultRename<Impl>::sortInsts()
     for (int i = 0; i < insts_from_decode; ++i) {
         DynInstPtr inst = fromDecode->insts[i];
         insts[inst->threadNumber].push_back(inst);
+#if TRACING_ON
+        if (DTRACE(O3PipeView)) {
+            inst->renameTick = curTick() - inst->fetchTick;
+        }
+#endif
     }
 }
 

util/o3-pipeview.py

@@ -64,11 +64,11 @@ insts = {
                           # out of order for more then 2000 CPU ticks,
                           # otherwise the print may not start/stop
                           # at the time specified by tick_start/stop.
-    'only_committed':0    # Set if only committed instructions are printed.
+    'only_committed':0,   # Set if only committed instructions are printed.
 }
 
 def process_trace(trace, outfile, cycle_time, width, color, timestamps,
-                  committed_only, start_tick, stop_tick, start_sn, stop_sn):
+                  committed_only, store_completions, start_tick, stop_tick, start_sn, stop_sn):
     global insts
 
     insts['sn_start'] = start_sn
@@ -80,28 +80,22 @@ def process_trace(trace, outfile, cycle_time, width, color, timestamps,
     line = None
     fields = None
 
-    # Read the first line
-    line = trace.readline()
-    if not line: return
-    fields = line.split(':')
-
     # Skip lines up to the starting tick
     if start_tick != 0:
         while True:
-            if fields[0] != 'O3PipeView': continue
-            if (int(fields[2]) > 0 and
-                int(fields[2]) >= start_tick-insts['tick_drift']): break
             line = trace.readline()
             if not line: return
             fields = line.split(':')
-
-    # Skip lines up to the starting sequence number
-    if start_sn != 0:
-        while True:
             if fields[0] != 'O3PipeView': continue
-            if (fields[1] == 'fetch' and
+            if int(fields[2]) >= start_tick: break
-                int(fields[5]) >= (start_sn-insts['max_threshold'])):
+    elif start_sn != 0:
-                break
+        while True:
+            line = trace.readline()
+            if not line: return
+            fields = line.split(':')
+            if fields[0] != 'O3PipeView': continue
+            if fields[1] == 'fetch' and int(fields[5]) >= start_sn: break
+    else:
         line = trace.readline()
         if not line: return
         fields = line.split(':')
@@ -114,12 +108,17 @@ def process_trace(trace, outfile, cycle_time, width, color, timestamps,
 
     # Print header
     outfile.write('// f = fetch, d = decode, n = rename, p = dispatch, '
-                  'i = issue, c = complete, r = retire\n\n')
+                  'i = issue, c = complete, r = retire')
+
+    if store_completions:
+        outfile.write(', s = store-complete')
+    outfile.write('\n\n')
+
     outfile.write(' ' + 'timeline'.center(width) +
                   '   ' + 'tick'.center(15) +
                   '  ' + 'pc.upc'.center(12) +
                   '  ' + 'disasm'.ljust(25) +
-                  '  ' + 'seq_num'.center(15))
+                  '  ' + 'seq_num'.center(10))
     if timestamps:
         outfile.write('timestamps'.center(25))
     outfile.write('\n')
@@ -138,9 +137,16 @@ def process_trace(trace, outfile, cycle_time, width, color, timestamps,
                 curr_inst['sn'] = int(fields[5])
                 curr_inst['disasm'] = ' '.join(fields[6][:-1].split())
             elif fields[1] == 'retire':
-                queue_inst(outfile, curr_inst, cycle_time, width, color, timestamps)
+                if curr_inst['retire'] == 0:
+                    curr_inst['disasm'] = '-----' + curr_inst['disasm']
+                if store_completions:
+                    curr_inst[fields[3]] = int(fields[4])
+                queue_inst(outfile, curr_inst, cycle_time, width, color, timestamps, store_completions)
+
         line = trace.readline()
-        if not line: return
+        if not line:
+            print_insts(outfile, cycle_time, width, color, timestamps, store_completions, 0)
+            return
         fields = line.split(':')
 
 
@@ -150,15 +156,15 @@ def compare_by_sn(a, b):
 
 # Puts new instruction into the print queue.
 # Sorts out and prints instructions when their number reaches threshold value
-def queue_inst(outfile, inst, cycle_time, width, color, timestamps):
+def queue_inst(outfile, inst, cycle_time, width, color, timestamps, store_completions):
     global insts
     l_copy = copy.deepcopy(inst)
     insts['queue'].append(l_copy)
     if len(insts['queue']) > insts['max_threshold']:
-        print_insts(outfile, cycle_time, width, color, timestamps, insts['min_threshold'])
+        print_insts(outfile, cycle_time, width, color, timestamps, store_completions, insts['min_threshold'])
 
 # Sorts out and prints instructions in print queue
-def print_insts(outfile, cycle_time, width, color, timestamps, lower_threshold):
+def print_insts(outfile, cycle_time, width, color, timestamps, store_completions, lower_threshold):
     global insts
     insts['queue'].sort(compare_by_sn)
     while len(insts['queue']) > lower_threshold:
@@ -179,10 +185,10 @@ def print_insts(outfile, cycle_time, width, color, timestamps, lower_threshold):
 
         if (insts['only_committed'] != 0 and print_item['retire'] == 0):
             continue; # retire is set to zero if it hasn't been completed
-        print_inst(outfile,  print_item, cycle_time, width, color, timestamps)
+        print_inst(outfile,  print_item, cycle_time, width, color, timestamps, store_completions)
 
 # Prints a single instruction
-def print_inst(outfile, inst, cycle_time, width, color, timestamps):
+def print_inst(outfile, inst, cycle_time, width, color, timestamps, store_completions):
     if color:
         from m5.util.terminal import termcap
     else:
@@ -208,7 +214,13 @@ def print_inst(outfile, inst, cycle_time, width, color, timestamps):
                'shorthand': 'c'},
               {'name': 'retire',
                'color': termcap.Blue + termcap.Reverse,
-               'shorthand': 'r'}]
+               'shorthand': 'r'}
+              ]
+    if store_completions:
+        stages.append(
+            {'name': 'store',
+             'color': termcap.Yellow + termcap.Reverse,
+             'shorthand': 's'})
 
     # Print
 
@@ -219,6 +231,8 @@ def print_inst(outfile, inst, cycle_time, width, color, timestamps):
     # be 'retire' if the instruction is not comlpeted.
     last_event_time = max(inst['fetch'], inst['decode'],inst['rename'],
                       inst['dispatch'],inst['issue'], inst['complete'], inst['retire'])
+    if store_completions:
+        last_event_time = max(last_event_time, inst['store'])
 
     # Timeline shorter then time_width is printed in compact form where
     # the print continues at the start of the same line.
@@ -272,7 +286,7 @@ def print_inst(outfile, inst, cycle_time, width, color, timestamps):
                     inst['pc'].rjust(10),
                     inst['upc'],
                     inst['disasm'].ljust(25),
-                    str(inst['sn']).rjust(15)))
+                    str(inst['sn']).rjust(10)))
             if timestamps:
                 outfile.write('  f=%s, r=%s' % (inst['fetch'], inst['retire']))
             outfile.write('\n')
@@ -329,6 +343,10 @@ def main():
         '--only_committed',
         action='store_true', default=False,
         help="display only committed (completed) instructions (default: '%default')")
+    parser.add_option(
+        '--store_completions',
+        action='store_true', default=False,
+        help="additionally display store completion ticks (default: '%default')")
     (options, args) = parser.parse_args()
     if len(args) != 1:
         parser.error('incorrect number of arguments')
@@ -347,7 +365,8 @@ def main():
         with open(options.outfile, 'w') as out:
             process_trace(trace, out, options.cycle_time, options.width,
                           options.color, options.timestamps,
-                          options.only_committed, *(tick_range + inst_range))
+                          options.only_committed, options.store_completions,
+                          *(tick_range + inst_range))
     print 'done!'