[tools] Compute percentiles for GC NVP

tools/eval_gc_time.sh

 #!/bin/bash
 #
 # Copyright 2015 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Convenience Script used to rank GC NVP output.
 
 print_usage_and_die() {
   echo "Usage: $0 [OPTIONS]"
   echo ""
   echo "OPTIONS"
   echo  "  -r|--rank new-gen-rank|old-gen-rank    GC mode to profile"
   echo  "                                         (default: old-gen-rank)"
   echo  "  -s|--sort avg|max                      sorting mode (default: max)"
   echo  "  -t|--top-level                         include top-level categories"
   echo  "  -c|--csv                               provide csv output"
   echo  "  -f|--file FILE                         profile input in a file"
   echo  "                                         (default: stdin)"
+  echo  "  -p|--percentiles                       comma separated percentiles"
   exit 1
 }
 
 OP=old-gen-rank
 RANK_MODE=max
 TOP_LEVEL=no
 CSV=""
 LOGFILE=/dev/stdin
+PERCENTILES=""
 
 while [[ $# -ge 1 ]]
 do
   key="$1"
   case $key in
     -r|--rank)
       case $2 in
         new-gen-rank|old-gen-rank)
           OP="$2"
           ;;
@@ skipping 15 matching lines @@
     -t|--top-level)
       TOP_LEVEL=yes
       ;;
     -c|--csv)
       CSV=" --csv "
       ;;
     -f|--file)
       LOGFILE=$2
       shift
       ;;
+    -f|--percentiles)
+      PERCENTILES="--percentiles=$2"
+      shift
+      ;;
     *)
       break
       ;;
   esac
   shift
 done
 
 if [[ $# -ne 0 ]]; then
   echo "Unknown option(s): $@"
   echo ""
@@ skipping 65 matching lines @@
 
 BASE_DIR=$(dirname $0)
 
 case $OP in
   new-gen-rank)
     cat $LOGFILE | grep "gc=s" \
       | $BASE_DIR/eval_gc_nvp.py \
       --no-histogram \
       --rank $RANK_MODE \
       $CSV \
+      $PERCENTILES \
       ${INTERESTING_NEW_GEN_KEYS}
     ;;
   old-gen-rank)
     cat $LOGFILE | grep "gc=ms" \
       | $BASE_DIR/eval_gc_nvp.py \
       --no-histogram \
       --rank $RANK_MODE \
       $CSV \
+      $PERCENTILES \
       ${INTERESTING_OLD_GEN_KEYS}
     ;;
   *)
     ;;
 esac