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Merge "releasetools: Reduce memory footprint for BBOTA generation."

This commit is contained in:
Tao Bao 2017-03-08 17:43:33 +00:00 committed by Gerrit Code Review
parent 3838ae7e9b 183e56e83d
commit 3b1f260205
2 changed files with 158 additions and 112 deletions
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255
tools/releasetools/blockimgdiff.py
View File

@ -24,8 +24,8 @@ import os
import os.path
import re
import subprocess
import sys
import threading
import tempfile
from collections import deque, OrderedDict
from hashlib import sha1
@ -35,69 +35,67 @@ from rangelib import RangeSet
__all__ = ["EmptyImage", "DataImage", "BlockImageDiff"]
def compute_patch(src, tgt, imgdiff=False):
srcfd, srcfile = tempfile.mkstemp(prefix="src-")
tgtfd, tgtfile = tempfile.mkstemp(prefix="tgt-")
patchfd, patchfile = tempfile.mkstemp(prefix="patch-")
os.close(patchfd)
def compute_patch(srcfile, tgtfile, imgdiff=False):
patchfile = common.MakeTempFile(prefix="patch-")
try:
with os.fdopen(srcfd, "wb") as f_src:
for p in src:
f_src.write(p)
if imgdiff:
p = subprocess.call(
["imgdiff", "-z", srcfile, tgtfile, patchfile],
stdout=open(os.devnull, 'w'),
stderr=subprocess.STDOUT)
else:
p = subprocess.call(
["bsdiff", srcfile, tgtfile, patchfile],
stdout=open(os.devnull, 'w'),
stderr=subprocess.STDOUT)
with os.fdopen(tgtfd, "wb") as f_tgt:
for p in tgt:
f_tgt.write(p)
try:
os.unlink(patchfile)
except OSError:
pass
if imgdiff:
p = subprocess.call(["imgdiff", "-z", srcfile, tgtfile, patchfile],
stdout=open("/dev/null", "a"),
stderr=subprocess.STDOUT)
else:
p = subprocess.call(["bsdiff", srcfile, tgtfile, patchfile])
if p:
raise ValueError("diff failed: " + str(p))
if p:
raise ValueError("diff failed: " + str(p))
with open(patchfile, "rb") as f:
return f.read()
finally:
try:
os.unlink(srcfile)
os.unlink(tgtfile)
os.unlink(patchfile)
except OSError:
pass
with open(patchfile, "rb") as f:
return f.read()
class Image(object):
def RangeSha1(self, ranges):
raise NotImplementedError
def ReadRangeSet(self, ranges):
raise NotImplementedError
def TotalSha1(self, include_clobbered_blocks=False):
raise NotImplementedError
def WriteRangeDataToFd(self, ranges, fd):
raise NotImplementedError
class EmptyImage(Image):
"""A zero-length image."""
blocksize = 4096
care_map = RangeSet()
clobbered_blocks = RangeSet()
extended = RangeSet()
total_blocks = 0
file_map = {}
def __init__(self):
self.blocksize = 4096
self.care_map = RangeSet()
self.clobbered_blocks = RangeSet()
self.extended = RangeSet()
self.total_blocks = 0
self.file_map = {}
def RangeSha1(self, ranges):
return sha1().hexdigest()
def ReadRangeSet(self, ranges):
return ()
def TotalSha1(self, include_clobbered_blocks=False):
# EmptyImage always carries empty clobbered_blocks, so
# include_clobbered_blocks can be ignored.
assert self.clobbered_blocks.size() == 0
return sha1().hexdigest()
def WriteRangeDataToFd(self, ranges, fd):
raise ValueError("Can't write data from EmptyImage to file")
class DataImage(Image):
"""An image wrapped around a single string of data."""
@ -160,23 +158,39 @@ class DataImage(Image):
if clobbered_blocks:
self.file_map["__COPY"] = RangeSet(data=clobbered_blocks)
def _GetRangeData(self, ranges):
for s, e in ranges:
yield self.data[s*self.blocksize:e*self.blocksize]
def RangeSha1(self, ranges):
h = sha1()
for data in self._GetRangeData(ranges):
h.update(data)
return h.hexdigest()
def ReadRangeSet(self, ranges):
return [self.data[s*self.blocksize:e*self.blocksize] for (s, e) in ranges]
return [self._GetRangeData(ranges)]
def TotalSha1(self, include_clobbered_blocks=False):
if not include_clobbered_blocks:
ranges = self.care_map.subtract(self.clobbered_blocks)
return sha1(self.ReadRangeSet(ranges)).hexdigest()
return self.RangeSha1(self.care_map.subtract(self.clobbered_blocks))
else:
return sha1(self.data).hexdigest()
def WriteRangeDataToFd(self, ranges, fd):
for data in self._GetRangeData(ranges):
fd.write(data)
class Transfer(object):
def __init__(self, tgt_name, src_name, tgt_ranges, src_ranges, style, by_id):
def __init__(self, tgt_name, src_name, tgt_ranges, src_ranges, tgt_sha1,
src_sha1, style, by_id):
self.tgt_name = tgt_name
self.src_name = src_name
self.tgt_ranges = tgt_ranges
self.src_ranges = src_ranges
self.tgt_sha1 = tgt_sha1
self.src_sha1 = src_sha1
self.style = style
self.intact = (getattr(tgt_ranges, "monotonic", False) and
getattr(src_ranges, "monotonic", False))
@ -251,6 +265,9 @@ class HeapItem(object):
# Implementations are free to break up the data into list/tuple
# elements in any way that is convenient.
#
# RangeSha1(): a function that returns (as a hex string) the SHA-1
# hash of all the data in the specified range.
#
# TotalSha1(): a function that returns (as a hex string) the SHA-1
# hash of all the data in the image (ie, all the blocks in the
# care_map minus clobbered_blocks, or including the clobbered
@ -332,15 +349,6 @@ class BlockImageDiff(object):
self.ComputePatches(prefix)
self.WriteTransfers(prefix)
def HashBlocks(self, source, ranges): # pylint: disable=no-self-use
data = source.ReadRangeSet(ranges)
ctx = sha1()
for p in data:
ctx.update(p)
return ctx.hexdigest()
def WriteTransfers(self, prefix):
def WriteSplitTransfers(out, style, target_blocks):
"""Limit the size of operand in command 'new' and 'zero' to 1024 blocks.
@ -397,7 +405,7 @@ class BlockImageDiff(object):
stashed_blocks += sr.size()
out.append("stash %d %s\n" % (sid, sr.to_string_raw()))
else:
sh = self.HashBlocks(self.src, sr)
sh = self.src.RangeSha1(sr)
if sh in stashes:
stashes[sh] += 1
else:
@ -429,7 +437,7 @@ class BlockImageDiff(object):
mapped_stashes = []
for stash_raw_id, sr in xf.use_stash:
unstashed_src_ranges = unstashed_src_ranges.subtract(sr)
sh = self.HashBlocks(self.src, sr)
sh = self.src.RangeSha1(sr)
sr = xf.src_ranges.map_within(sr)
mapped_stashes.append(sr)
if self.version == 2:
@ -515,7 +523,7 @@ class BlockImageDiff(object):
out.append("%s %s %s %s\n" % (
xf.style,
self.HashBlocks(self.tgt, xf.tgt_ranges),
xf.tgt_sha1,
xf.tgt_ranges.to_string_raw(), src_str))
total += tgt_size
elif xf.style in ("bsdiff", "imgdiff"):
@ -542,8 +550,8 @@ class BlockImageDiff(object):
out.append("%s %d %d %s %s %s %s\n" % (
xf.style,
xf.patch_start, xf.patch_len,
self.HashBlocks(self.src, xf.src_ranges),
self.HashBlocks(self.tgt, xf.tgt_ranges),
xf.src_sha1,
xf.tgt_sha1,
xf.tgt_ranges.to_string_raw(), src_str))
total += tgt_size
elif xf.style == "zero":
@ -574,8 +582,7 @@ class BlockImageDiff(object):
stash_threshold)
if self.version >= 3:
self.touched_src_sha1 = self.HashBlocks(
self.src, self.touched_src_ranges)
self.touched_src_sha1 = self.src.RangeSha1(self.touched_src_ranges)
# Zero out extended blocks as a workaround for bug 20881595.
if self.tgt.extended:
@ -674,7 +681,7 @@ class BlockImageDiff(object):
if self.version == 2:
stashed_blocks_after += sr.size()
else:
sh = self.HashBlocks(self.src, sr)
sh = self.src.RangeSha1(sr)
if sh not in stashes:
stashed_blocks_after += sr.size()
@ -731,7 +738,7 @@ class BlockImageDiff(object):
stashed_blocks -= sr.size()
heapq.heappush(free_stash_ids, sid)
else:
sh = self.HashBlocks(self.src, sr)
sh = self.src.RangeSha1(sr)
assert sh in stashes
stashes[sh] -= 1
if stashes[sh] == 0:
@ -745,10 +752,10 @@ class BlockImageDiff(object):
def ComputePatches(self, prefix):
print("Reticulating splines...")
diff_q = []
diff_queue = []
patch_num = 0
with open(prefix + ".new.dat", "wb") as new_f:
for xf in self.transfers:
for index, xf in enumerate(self.transfers):
if xf.style == "zero":
tgt_size = xf.tgt_ranges.size() * self.tgt.blocksize
print("%10d %10d (%6.2f%%) %7s %s %s" % (
@ -756,17 +763,13 @@ class BlockImageDiff(object):
str(xf.tgt_ranges)))
elif xf.style == "new":
for piece in self.tgt.ReadRangeSet(xf.tgt_ranges):
new_f.write(piece)
self.tgt.WriteRangeDataToFd(xf.tgt_ranges, new_f)
tgt_size = xf.tgt_ranges.size() * self.tgt.blocksize
print("%10d %10d (%6.2f%%) %7s %s %s" % (
tgt_size, tgt_size, 100.0, xf.style,
xf.tgt_name, str(xf.tgt_ranges)))
elif xf.style == "diff":
src = self.src.ReadRangeSet(xf.src_ranges)
tgt = self.tgt.ReadRangeSet(xf.tgt_ranges)
# We can't compare src and tgt directly because they may have
# the same content but be broken up into blocks differently, eg:
#
@ -775,20 +778,11 @@ class BlockImageDiff(object):
# We want those to compare equal, ideally without having to
# actually concatenate the strings (these may be tens of
# megabytes).
src_sha1 = sha1()
for p in src:
src_sha1.update(p)
tgt_sha1 = sha1()
tgt_size = 0
for p in tgt:
tgt_sha1.update(p)
tgt_size += len(p)
if src_sha1.digest() == tgt_sha1.digest():
if xf.src_sha1 == xf.tgt_sha1:
# These are identical; we don't need to generate a patch,
# just issue copy commands on the device.
xf.style = "move"
tgt_size = xf.tgt_ranges.size() * self.tgt.blocksize
if xf.src_ranges != xf.tgt_ranges:
print("%10d %10d (%6.2f%%) %7s %s %s (from %s)" % (
tgt_size, tgt_size, 100.0, xf.style,
@ -815,38 +809,64 @@ class BlockImageDiff(object):
xf.tgt_name.split(".")[-1].lower()
in ("apk", "jar", "zip"))
xf.style = "imgdiff" if imgdiff else "bsdiff"
diff_q.append((tgt_size, src, tgt, xf, patch_num))
diff_queue.append((index, imgdiff, patch_num))
patch_num += 1
else:
assert False, "unknown style " + xf.style
if diff_q:
if diff_queue:
if self.threads > 1:
print("Computing patches (using %d threads)..." % (self.threads,))
else:
print("Computing patches...")
diff_q.sort()
patches = [None] * patch_num
diff_total = len(diff_queue)
patches = [None] * diff_total
# TODO: Rewrite with multiprocessing.ThreadPool?
# Using multiprocessing doesn't give additional benefits, due to the
# pattern of the code. The diffing work is done by subprocess.call, which
# already runs in a separate process (not affected much by the GIL -
# Global Interpreter Lock). Using multiprocess also requires either a)
# writing the diff input files in the main process before forking, or b)
# reopening the image file (SparseImage) in the worker processes. Doing
# neither of them further improves the performance.
lock = threading.Lock()
def diff_worker():
while True:
with lock:
if not diff_q:
if not diff_queue:
return
tgt_size, src, tgt, xf, patchnum = diff_q.pop()
patch = compute_patch(src, tgt, imgdiff=(xf.style == "imgdiff"))
size = len(patch)
xf_index, imgdiff, patch_index = diff_queue.pop()
xf = self.transfers[xf_index]
src_ranges = xf.src_ranges
tgt_ranges = xf.tgt_ranges
# Needs lock since WriteRangeDataToFd() is stateful (calling seek).
with lock:
patches[patchnum] = (patch, xf)
print("%10d %10d (%6.2f%%) %7s %s %s %s" % (
size, tgt_size, size * 100.0 / tgt_size, xf.style,
xf.tgt_name if xf.tgt_name == xf.src_name else (
xf.tgt_name + " (from " + xf.src_name + ")"),
str(xf.tgt_ranges), str(xf.src_ranges)))
src_file = common.MakeTempFile(prefix="src-")
with open(src_file, "wb") as fd:
self.src.WriteRangeDataToFd(src_ranges, fd)
tgt_file = common.MakeTempFile(prefix="tgt-")
with open(tgt_file, "wb") as fd:
self.tgt.WriteRangeDataToFd(tgt_ranges, fd)
try:
patch = compute_patch(src_file, tgt_file, imgdiff)
except ValueError as e:
raise ValueError(
"Failed to generate diff for %s: src=%s, tgt=%s: %s" % (
xf.tgt_name, xf.src_ranges, xf.tgt_ranges, e.message))
with lock:
patches[patch_index] = (xf_index, patch)
if sys.stdout.isatty():
progress = len(patches) * 100 / diff_total
# '\033[K' is to clear to EOL.
print(' [%d%%] %s\033[K' % (progress, xf.tgt_name), end='\r')
sys.stdout.flush()
threads = [threading.Thread(target=diff_worker)
for _ in range(self.threads)]
@ -854,16 +874,29 @@ class BlockImageDiff(object):
th.start()
while threads:
threads.pop().join()
if sys.stdout.isatty():
print('\n')
else:
patches = []
p = 0
with open(prefix + ".patch.dat", "wb") as patch_f:
for patch, xf in patches:
xf.patch_start = p
offset = 0
with open(prefix + ".patch.dat", "wb") as patch_fd:
for index, patch in patches:
xf = self.transfers[index]
xf.patch_len = len(patch)
patch_f.write(patch)
p += len(patch)
xf.patch_start = offset
offset += xf.patch_len
patch_fd.write(patch)
if common.OPTIONS.verbose:
tgt_size = xf.tgt_ranges.size() * self.tgt.blocksize
print("%10d %10d (%6.2f%%) %7s %s %s %s" % (
xf.patch_len, tgt_size, xf.patch_len * 100.0 / tgt_size,
xf.style,
xf.tgt_name if xf.tgt_name == xf.src_name else (
xf.tgt_name + " (from " + xf.src_name + ")"),
xf.tgt_ranges, xf.src_ranges))
def AssertSequenceGood(self):
# Simulate the sequences of transfers we will output, and check that:
@ -1211,7 +1244,9 @@ class BlockImageDiff(object):
# Change nothing for small files.
if (tgt_ranges.size() <= max_blocks_per_transfer and
src_ranges.size() <= max_blocks_per_transfer):
Transfer(tgt_name, src_name, tgt_ranges, src_ranges, style, by_id)
Transfer(tgt_name, src_name, tgt_ranges, src_ranges,
self.tgt.RangeSha1(tgt_ranges), self.src.RangeSha1(src_ranges),
style, by_id)
return
while (tgt_ranges.size() > max_blocks_per_transfer and
@ -1221,8 +1256,9 @@ class BlockImageDiff(object):
tgt_first = tgt_ranges.first(max_blocks_per_transfer)
src_first = src_ranges.first(max_blocks_per_transfer)
Transfer(tgt_split_name, src_split_name, tgt_first, src_first, style,
by_id)
Transfer(tgt_split_name, src_split_name, tgt_first, src_first,
self.tgt.RangeSha1(tgt_first), self.src.RangeSha1(src_first),
style, by_id)
tgt_ranges = tgt_ranges.subtract(tgt_first)
src_ranges = src_ranges.subtract(src_first)
@ -1234,8 +1270,9 @@ class BlockImageDiff(object):
assert tgt_ranges.size() and src_ranges.size()
tgt_split_name = "%s-%d" % (tgt_name, pieces)
src_split_name = "%s-%d" % (src_name, pieces)
Transfer(tgt_split_name, src_split_name, tgt_ranges, src_ranges, style,
by_id)
Transfer(tgt_split_name, src_split_name, tgt_ranges, src_ranges,
self.tgt.RangeSha1(tgt_ranges), self.src.RangeSha1(src_ranges),
style, by_id)
def AddTransfer(tgt_name, src_name, tgt_ranges, src_ranges, style, by_id,
split=False):
@ -1244,7 +1281,9 @@ class BlockImageDiff(object):
# We specialize diff transfers only (which covers bsdiff/imgdiff/move);
# otherwise add the Transfer() as is.
if style != "diff" or not split:
Transfer(tgt_name, src_name, tgt_ranges, src_ranges, style, by_id)
Transfer(tgt_name, src_name, tgt_ranges, src_ranges,
self.tgt.RangeSha1(tgt_ranges), self.src.RangeSha1(src_ranges),
style, by_id)
return
# Handle .odex files specially to analyze the block-wise difference. If

15
tools/releasetools/sparse_img.py
View File

@ -144,6 +144,12 @@ class SparseImage(object):
f.seek(16, os.SEEK_SET)
f.write(struct.pack("<2I", self.total_blocks, self.total_chunks))
def RangeSha1(self, ranges):
h = sha1()
for data in self._GetRangeData(ranges):
h.update(data)
return h.hexdigest()
def ReadRangeSet(self, ranges):
return [d for d in self._GetRangeData(ranges)]
@ -155,10 +161,11 @@ class SparseImage(object):
ranges = self.care_map
if not include_clobbered_blocks:
ranges = ranges.subtract(self.clobbered_blocks)
h = sha1()
for d in self._GetRangeData(ranges):
h.update(d)
return h.hexdigest()
return self.RangeSha1(ranges)
def WriteRangeDataToFd(self, ranges, fd):
for data in self._GetRangeData(ranges):
fd.write(data)
def _GetRangeData(self, ranges):
"""Generator that produces all the image data in 'ranges'. The