Update gc tracking instructions and gdb commands.

crypto-aes
Scott Shawcroft 3 years ago
parent 8364c60eb2
commit a4d197a6ef
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GPG Key ID: 9349BC7E64B1921E
  1. 2
      tools/gc_activity.md
  2. 141
      tools/gc_activity_between_collects.py
  3. 15
      tools/output_gc_until_repl.txt

@ -13,7 +13,7 @@ correct port. GDB is usually :3333 and JLink is :2331.
Now, run gdb from your port directory:
```
arm-none-eabi-gdb -x ../tools/output_gc_until_repl.txt build-metro_m0_express/firmware.elf
arm-none-eabi-gdb -x ../../tools/output_gc_until_repl.txt build-metro_m0_express/firmware.elf
```
This will take a little time while it breaks, backtraces and continues for every

@ -0,0 +1,141 @@
import sys
import json
# Map start block to current allocation info.
current_heap = {}
allocation_history = []
root = {}
def change_root(trace, size):
level = root
for frame in reversed(trace):
file_location = frame[1]
if file_location not in level:
level[file_location] = {"blocks": 0,
"file": file_location,
"function": frame[2],
"subcalls": {}}
level[file_location]["blocks"] += size
level = level[file_location]["subcalls"]
total_actions = 0
non_single_block_streak = 0
max_nsbs = 0
last_action = None
last_total_actions = 0
count = 0
actions = {}
last_ticks_ms = 0
ticks_ms = 0
block_sizes = {}
allocation_sources = {}
with open(sys.argv[1], "r") as f:
for line in f:
if not line.strip():
break
for line in f:
action = None
if line.startswith("Breakpoint 2"):
break
next(f) # throw away breakpoint code line
# print(next(f)) # first frame
block = 0
size = 0
trace = []
for line in f:
# print(line.strip())
if line[0] == "#":
frame = line.strip().split()
if frame[1].startswith("0x"):
trace.append((frame[1], frame[-1], frame[3]))
else:
trace.append(("0x0", frame[-1], frame[1]))
elif line[0] == "$":
#print(line.strip().split()[-1])
block = int(line.strip().split()[-1][2:], 16)
next_line = next(f)
size = int(next_line.strip().split()[-1][2:], 16)
# next_line = next(f)
# ticks_ms = int(next_line.strip().split()[-1][2:], 16)
if not line.strip():
break
action = "unknown"
if block not in current_heap:
current_heap[block] = {"start_block": block, "size": size, "start_trace": trace, "start_time": total_actions}
action = "alloc"
if size == 1:
max_nsbs = max(max_nsbs, non_single_block_streak)
non_single_block_streak = 0
else:
non_single_block_streak += 1
#change_root(trace, size)
if size not in block_sizes:
block_sizes[size] = 0
source = trace[-1][-1]
if source not in allocation_sources:
print(trace)
allocation_sources[source] = 0
allocation_sources[source] += 1
block_sizes[size] += 1
else:
alloc = current_heap[block]
alloc["end_trace"] = trace
alloc["end_time"] = total_actions
change_root(alloc["start_trace"], -1 * alloc["size"])
if size > 0:
action = "realloc"
current_heap[block] = {"start_block": block, "size": size, "start_trace": trace, "start_time": total_actions}
#change_root(trace, size)
else:
action = "free"
if trace[0][2] == "gc_sweep":
action = "sweep"
non_single_block_streak = 0
if (trace[3][2] == "py_gc_collect" or (trace[3][2] == "gc_deinit" and count > 1)) and last_action != "sweep":
print(ticks_ms - last_ticks_ms, total_actions - last_total_actions, "gc.collect", max_nsbs)
print(actions)
print(block_sizes)
print(allocation_sources)
actions = {}
block_sizes = {}
allocation_sources = {}
if count % 2 == 0:
print()
count += 1
last_total_actions = total_actions
last_ticks_ms = ticks_ms
max_nsbs = 0
del current_heap[block]
alloc["end_cause"] = action
allocation_history.append(alloc)
if action not in actions:
actions[action] = 0
actions[action] += 1
last_action = action
#print(total_actions, non_single_block_streak, action, block, size)
total_actions += 1
print(actions)
print(max_nsbs)
print()
for alloc in current_heap.values():
alloc["end_trace"] = ""
alloc["end_time"] = total_actions
allocation_history.append(alloc)
def print_frame(frame, indent=0):
for key in sorted(frame):
if not frame[key]["blocks"] or key.startswith("../py/malloc.c") or key.startswith("../py/gc.c"):
continue
print(" " * (indent - 1), key, frame[key]["function"], frame[key]["blocks"], "blocks")
print_frame(frame[key]["subcalls"], indent + 2)
# print_frame(root)
# total_blocks = 0
# for key in sorted(root):
# total_blocks += root[key]["blocks"]
# print(total_blocks, "total blocks")
# with open("allocation_history.json", "w") as f:
# json.dump(allocation_history, f)

@ -10,16 +10,23 @@ set logging on
set remote hardware-breakpoint-limit 4
# gc log
break gc.c:103
break gc.c:106
commands
backtrace
p/x start_block
p/x length
append binary memory ram.bin &_srelocate &_estack
p/x ticks_ms
# backtrace output redirect is currently broken in gdb so we use up instead.
# https://sourceware.org/bugzilla/show_bug.cgi?id=23439
# backtrace
up
up
up
up
# append binary memory ram.bin &_srelocate &_estack
continue
end
break main.c:179
break main.c:251
continue

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