EGL Multifile Blobcache: Make use of crc32_z algorithm instead of crc32c
To improve the performance in generating crc. Using crc32_z would reduce
the function duration by 98 ~ 99 % as follows.
Test: Genshin Impact Loading
Algorithm Num calls Total Duration (millisec)
crc32_z 3678 9909.88
crc32c 3596 1260876.81
Bug: b/373718861
Change-Id: I0b67265c4bcf199d4433b953a5a399629c9508f9
Signed-off-by: Jisun Lee <jisunnie.lee@samsung.com>
diff --git a/opengl/libs/EGL/FileBlobCache.cpp b/opengl/libs/EGL/FileBlobCache.cpp
index 4a0fac4..573ca54 100644
--- a/opengl/libs/EGL/FileBlobCache.cpp
+++ b/opengl/libs/EGL/FileBlobCache.cpp
@@ -27,6 +27,7 @@
#include <log/log.h>
#include <utils/Trace.h>
+#include <zlib.h>
// Cache file header
static const char* cacheFileMagic = "EGL$";
@@ -34,20 +35,10 @@
namespace android {
-uint32_t crc32c(const uint8_t* buf, size_t len) {
- const uint32_t polyBits = 0x82F63B78;
- uint32_t r = 0;
- for (size_t i = 0; i < len; i++) {
- r ^= buf[i];
- for (int j = 0; j < 8; j++) {
- if (r & 1) {
- r = (r >> 1) ^ polyBits;
- } else {
- r >>= 1;
- }
- }
- }
- return r;
+uint32_t GenerateCRC32(const uint8_t *data, size_t size)
+{
+ const unsigned long initialValue = crc32_z(0u, nullptr, 0u);
+ return static_cast<uint32_t>(crc32_z(initialValue, data, size));
}
FileBlobCache::FileBlobCache(size_t maxKeySize, size_t maxValueSize, size_t maxTotalSize,
@@ -101,7 +92,7 @@
return;
}
uint32_t* crc = reinterpret_cast<uint32_t*>(buf + 4);
- if (crc32c(buf + headerSize, cacheSize) != *crc) {
+ if (GenerateCRC32(buf + headerSize, cacheSize) != *crc) {
ALOGE("cache file failed CRC check");
close(fd);
return;
@@ -175,7 +166,7 @@
// Write the file magic and CRC
memcpy(buf, cacheFileMagic, 4);
uint32_t* crc = reinterpret_cast<uint32_t*>(buf + 4);
- *crc = crc32c(buf + headerSize, cacheSize);
+ *crc = GenerateCRC32(buf + headerSize, cacheSize);
if (write(fd, buf, fileSize) == -1) {
ALOGE("error writing cache file: %s (%d)", strerror(errno),
diff --git a/opengl/libs/EGL/FileBlobCache.h b/opengl/libs/EGL/FileBlobCache.h
index f083b0d..224444d 100644
--- a/opengl/libs/EGL/FileBlobCache.h
+++ b/opengl/libs/EGL/FileBlobCache.h
@@ -22,7 +22,7 @@
namespace android {
-uint32_t crc32c(const uint8_t* buf, size_t len);
+uint32_t GenerateCRC32(const uint8_t *data, size_t size);
class FileBlobCache : public BlobCache {
public:
diff --git a/opengl/libs/EGL/MultifileBlobCache.cpp b/opengl/libs/EGL/MultifileBlobCache.cpp
index 9905210..f7e33b3 100644
--- a/opengl/libs/EGL/MultifileBlobCache.cpp
+++ b/opengl/libs/EGL/MultifileBlobCache.cpp
@@ -214,9 +214,8 @@
}
// Ensure we have a good CRC
- if (header.crc !=
- crc32c(mappedEntry + sizeof(MultifileHeader),
- fileSize - sizeof(MultifileHeader))) {
+ if (header.crc != GenerateCRC32(mappedEntry + sizeof(MultifileHeader),
+ fileSize - sizeof(MultifileHeader))) {
ALOGV("INIT: Entry %u failed CRC check! Removing.", entryHash);
if (remove(fullPath.c_str()) != 0) {
ALOGE("Error removing %s: %s", fullPath.c_str(), std::strerror(errno));
@@ -532,9 +531,9 @@
mBuildId.length() > PROP_VALUE_MAX ? PROP_VALUE_MAX : mBuildId.length());
// Finally update the crc, using cacheVersion and everything the follows
- status.crc =
- crc32c(reinterpret_cast<uint8_t*>(&status) + offsetof(MultifileStatus, cacheVersion),
- sizeof(status) - offsetof(MultifileStatus, cacheVersion));
+ status.crc = GenerateCRC32(
+ reinterpret_cast<uint8_t *>(&status) + offsetof(MultifileStatus, cacheVersion),
+ sizeof(status) - offsetof(MultifileStatus, cacheVersion));
// Create the status file
std::string cacheStatus = baseDir + "/" + kMultifileBlobCacheStatusFile;
@@ -599,9 +598,9 @@
}
// Ensure we have a good CRC
- if (status.crc !=
- crc32c(reinterpret_cast<uint8_t*>(&status) + offsetof(MultifileStatus, cacheVersion),
- sizeof(status) - offsetof(MultifileStatus, cacheVersion))) {
+ if (status.crc != GenerateCRC32(reinterpret_cast<uint8_t *>(&status) +
+ offsetof(MultifileStatus, cacheVersion),
+ sizeof(status) - offsetof(MultifileStatus, cacheVersion))) {
ALOGE("STATUS(CHECK): Cache status failed CRC check!");
return false;
}
@@ -840,8 +839,8 @@
// Add CRC check to the header (always do this last!)
MultifileHeader* header = reinterpret_cast<MultifileHeader*>(buffer);
- header->crc =
- crc32c(buffer + sizeof(MultifileHeader), bufferSize - sizeof(MultifileHeader));
+ header->crc = GenerateCRC32(buffer + sizeof(MultifileHeader),
+ bufferSize - sizeof(MultifileHeader));
ssize_t result = write(fd, buffer, bufferSize);
if (result != bufferSize) {
diff --git a/opengl/libs/EGL/MultifileBlobCache.h b/opengl/libs/EGL/MultifileBlobCache.h
index 18566c2..65aa2db 100644
--- a/opengl/libs/EGL/MultifileBlobCache.h
+++ b/opengl/libs/EGL/MultifileBlobCache.h
@@ -34,7 +34,7 @@
namespace android {
-constexpr uint32_t kMultifileBlobCacheVersion = 1;
+constexpr uint32_t kMultifileBlobCacheVersion = 2;
constexpr char kMultifileBlobCacheStatusFile[] = "cache.status";
struct MultifileHeader {
diff --git a/opengl/libs/EGL/fuzzer/Android.bp b/opengl/libs/EGL/fuzzer/Android.bp
index 022a2a3..4947e5f 100644
--- a/opengl/libs/EGL/fuzzer/Android.bp
+++ b/opengl/libs/EGL/fuzzer/Android.bp
@@ -36,6 +36,10 @@
"libutils",
],
+ shared_libs: [
+ "libz",
+ ],
+
srcs: [
"MultifileBlobCache_fuzzer.cpp",
],