readfile moved into run dir to allow multiple parallel runs

Set with --gem5-readefile helper

README.adoc

@@ -7088,10 +7088,13 @@ time \
 gem5 full system:
 
 ....
-printf 'm5 exit' > data/readfile
-./run --arch arm --gem5 --eval-busybox '/gem5.sh'
-printf 'dhrystone 100000' > data/readfile
-time ./run --arch arm --gem5-restore 1 --gem5
+time \
+  ./run \
+  --arch arm \
+  --eval-busybox '/gem5.sh' \
+  --gem5
+  --gem5-readfile 'dhrystone 100000' \
+;
 ....
 
 QEMU user mode:
@@ -7645,25 +7648,21 @@ restore='-l 1 -- --cpu-type=HPI --restore-with-cpu=HPI --caches --l2cache --l1d_
 
 # Generate a checkpoint after Linux boots, using the faster and less detailed CPU.
 # The boot takes a while, be patient young Padawan.
-printf '' > data/readfile
 eval "$cmd"
 
 # Restore the most recent checkpoint taken with the more detailed and slower HPI CPU,
 # and run the benchmark with parameter 1.000. We skip the boot completely, saving time!
-printf 'dhrystone 1000' > data/readfile
-eval "${cmd} ${restore}"
+eval "${cmd} --gem5-readfile 'dhrystone 1000' ${restore}"
 ./gem5-stat -a "$arch"
 
 # Now run again with another parameter 10.000.
 # This one should take more cycles!
-printf 'dhrystone 10000' > data/readfile
-eval "${cmd} ${restore}"
+eval "${cmd} --gem5-readfile 'dhrystone 10000' ${restore}"
 ./gem5-stat -a "$arch"
 
 # Get an interactive shell at the end of the restore
 # if you need to debug something more interactively.
-printf 'sh' > data/readfile
-eval "${cmd} ${restore}"
+eval "${cmd} --gem5-readfile 'sh' ${restore}"
 ....
 
 The `gem5-stats` commands output the approximate number of CPU cycles it took Dhrystone to run.

common.py

@@ -20,7 +20,6 @@ root_dir = os.path.dirname(os.path.abspath(__file__))
 data_dir = os.path.join(root_dir, 'data')
 p9_dir = os.path.join(data_dir, '9p')
 gem5_non_default_src_root_dir = os.path.join(data_dir, 'gem5')
-gem5_readfile_file = os.path.join(data_dir, 'readfile')
 out_dir = os.path.join(root_dir, 'out')
 bench_boot = os.path.join(out_dir, 'bench-boot.txt')
 common_dir = os.path.join(out_dir, 'common')
@@ -346,6 +345,7 @@ def setup(parser, **extra_args):
     this.m5out_dir = os.path.join(this.gem5_run_dir, 'm5out')
     this.stats_file = os.path.join(this.m5out_dir, 'stats.txt')
     this.trace_txt_file = os.path.join(this.m5out_dir, 'trace.txt')
+    this.gem5_readfile = os.path.join(this.gem5_run_dir, 'readfile')
     this.gem5_termout_file = os.path.join(this.gem5_run_dir, 'termout.txt')
     this.qemu_run_dir = os.path.join(this.out_arch_dir, 'qemu', str(args.run_id))
     this.qemu_trace_basename = 'trace.bin'
@@ -370,7 +370,7 @@ def setup(parser, **extra_args):
         this.executable = this.qemu_executable
         this.run_dir = this.qemu_run_dir
         this.termout_file = this.qemu_termout_file
-    this.gem5_config_dir = os.path.join(this.gem5_src_dir, 'config')
+    this.gem5_config_dir = os.path.join(this.gem5_src_dir, 'configs')
     this.gem5_se_file = os.path.join(this.gem5_config_dir, 'example', 'se.py')
     this.gem5_fs_file = os.path.join(this.gem5_config_dir, 'example', 'fs.py')
     this.run_cmd_file = os.path.join(this.run_dir, 'run.sh')

run

@@ -16,6 +16,7 @@ defaults = {
     'extra_emulator_args': [],
     'gem5_biglittle': False,
     'gem5_exe_args': '',
+    'gem5_readfile': '',
     'gem5_restore': None,
     'graphic': False,
     'initramfs': False,
@@ -94,6 +95,8 @@ def main(args, extra_args=None):
         trace_type = args.trace
 
     if args.gem5:
+        with open(common.gem5_readfile, 'w') as readfile:
+            readfile.write(args.gem5_readfile)
         memory = '{}B'.format(args.memory)
         gem5_exe_args = shlex.split(args.gem5_exe_args)
         if do_trace:
@@ -135,7 +138,7 @@ def main(args, extra_args=None):
                 '--kernel', common.vmlinux,
                 '--mem-size', memory,
                 '--num-cpus', str(args.cpus),
-                '--script', common.gem5_readfile_file,
+                '--script', common.gem5_readfile,
             ]
             if args.arch == 'x86_64':
                 if args.kvm:
@@ -350,6 +353,10 @@ gem.op5 --debug-flags=Exec fs.py --cpu-type=HPI --caches
         '--gem5-biglittle', default=defaults['gem5_biglittle'], action='store_true',
         help='Use fs_bigLITTLE.py instead of fs.py'
     )
+    parser.add_argument(
+        '--gem5-readfile', default=defaults['gem5_readfile'],
+        help='Set the contents of m5 readfile to this string.'
+    )
     init_group.add_argument(
         '-I', '--initramfs', default=defaults['initramfs'], action='store_true',
         help='Use initramfs instead of a root filesystem'