summaryrefslogtreecommitdiffstats
path: root/memory/replace/logalloc/replay/Replay.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'memory/replace/logalloc/replay/Replay.cpp')
-rw-r--r--memory/replace/logalloc/replay/Replay.cpp739
1 files changed, 739 insertions, 0 deletions
diff --git a/memory/replace/logalloc/replay/Replay.cpp b/memory/replace/logalloc/replay/Replay.cpp
new file mode 100644
index 0000000000..daf0580389
--- /dev/null
+++ b/memory/replace/logalloc/replay/Replay.cpp
@@ -0,0 +1,739 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#define MOZ_MEMORY_IMPL
+#include "mozmemory_wrap.h"
+
+#ifdef _WIN32
+# include <windows.h>
+# include <io.h>
+typedef intptr_t ssize_t;
+#else
+# include <sys/mman.h>
+# include <unistd.h>
+#endif
+#include <algorithm>
+#include <cmath>
+#include <cstdio>
+#include <cstring>
+
+#include "mozilla/Assertions.h"
+#include "mozilla/MathAlgorithms.h"
+#include "FdPrintf.h"
+
+static void die(const char* message) {
+ /* Here, it doesn't matter that fprintf may allocate memory. */
+ fprintf(stderr, "%s\n", message);
+ exit(1);
+}
+
+/* We don't want to be using malloc() to allocate our internal tracking
+ * data, because that would change the parameters of what is being measured,
+ * so we want to use data types that directly use mmap/VirtualAlloc. */
+template <typename T, size_t Len>
+class MappedArray {
+ public:
+ MappedArray() : mPtr(nullptr) {}
+
+ ~MappedArray() {
+ if (mPtr) {
+#ifdef _WIN32
+ VirtualFree(mPtr, sizeof(T) * Len, MEM_RELEASE);
+#else
+ munmap(mPtr, sizeof(T) * Len);
+#endif
+ }
+ }
+
+ T& operator[](size_t aIndex) const {
+ if (mPtr) {
+ return mPtr[aIndex];
+ }
+
+#ifdef _WIN32
+ mPtr = reinterpret_cast<T*>(VirtualAlloc(
+ nullptr, sizeof(T) * Len, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE));
+ if (mPtr == nullptr) {
+ die("VirtualAlloc error");
+ }
+#else
+ mPtr = reinterpret_cast<T*>(mmap(nullptr, sizeof(T) * Len,
+ PROT_READ | PROT_WRITE,
+ MAP_ANON | MAP_PRIVATE, -1, 0));
+ if (mPtr == MAP_FAILED) {
+ die("Mmap error");
+ }
+#endif
+ return mPtr[aIndex];
+ }
+
+ private:
+ mutable T* mPtr;
+};
+
+/* Type for records of allocations. */
+struct MemSlot {
+ void* mPtr;
+
+ // mRequest is only valid if mPtr is non-null. It doesn't need to be cleared
+ // when memory is freed or realloc()ed.
+ size_t mRequest;
+};
+
+/* An almost infinite list of slots.
+ * In essence, this is a linked list of arrays of groups of slots.
+ * Each group is 1MB. On 64-bits, one group allows to store 64k allocations.
+ * Each MemSlotList instance can store 1023 such groups, which means more
+ * than 67M allocations. In case more would be needed, we chain to another
+ * MemSlotList, and so on.
+ * Using 1023 groups makes the MemSlotList itself page sized on 32-bits
+ * and 2 pages-sized on 64-bits.
+ */
+class MemSlotList {
+ static const size_t kGroups = 1024 - 1;
+ static const size_t kGroupSize = (1024 * 1024) / sizeof(MemSlot);
+
+ MappedArray<MemSlot, kGroupSize> mSlots[kGroups];
+ MappedArray<MemSlotList, 1> mNext;
+
+ public:
+ MemSlot& operator[](size_t aIndex) const {
+ if (aIndex < kGroupSize * kGroups) {
+ return mSlots[aIndex / kGroupSize][aIndex % kGroupSize];
+ }
+ aIndex -= kGroupSize * kGroups;
+ return mNext[0][aIndex];
+ }
+};
+
+/* Helper class for memory buffers */
+class Buffer {
+ public:
+ Buffer() : mBuf(nullptr), mLength(0) {}
+
+ Buffer(const void* aBuf, size_t aLength)
+ : mBuf(reinterpret_cast<const char*>(aBuf)), mLength(aLength) {}
+
+ /* Constructor for string literals. */
+ template <size_t Size>
+ explicit Buffer(const char (&aStr)[Size]) : mBuf(aStr), mLength(Size - 1) {}
+
+ /* Returns a sub-buffer up-to but not including the given aNeedle character.
+ * The "parent" buffer itself is altered to begin after the aNeedle
+ * character.
+ * If the aNeedle character is not found, return the entire buffer, and empty
+ * the "parent" buffer. */
+ Buffer SplitChar(char aNeedle) {
+ char* buf = const_cast<char*>(mBuf);
+ char* c = reinterpret_cast<char*>(memchr(buf, aNeedle, mLength));
+ if (!c) {
+ return Split(mLength);
+ }
+
+ Buffer result = Split(c - buf);
+ // Remove the aNeedle character itself.
+ Split(1);
+ return result;
+ }
+
+ /* Returns a sub-buffer of at most aLength characters. The "parent" buffer is
+ * amputated of those aLength characters. If the "parent" buffer is smaller
+ * than aLength, then its length is used instead. */
+ Buffer Split(size_t aLength) {
+ Buffer result(mBuf, std::min(aLength, mLength));
+ mLength -= result.mLength;
+ mBuf += result.mLength;
+ return result;
+ }
+
+ /* Move the buffer (including its content) to the memory address of the aOther
+ * buffer. */
+ void Slide(Buffer aOther) {
+ memmove(const_cast<char*>(aOther.mBuf), mBuf, mLength);
+ mBuf = aOther.mBuf;
+ }
+
+ /* Returns whether the two involved buffers have the same content. */
+ bool operator==(Buffer aOther) {
+ return mLength == aOther.mLength &&
+ (mBuf == aOther.mBuf || !strncmp(mBuf, aOther.mBuf, mLength));
+ }
+
+ /* Returns whether the buffer is empty. */
+ explicit operator bool() { return mLength; }
+
+ /* Returns the memory location of the buffer. */
+ const char* get() { return mBuf; }
+
+ /* Returns the memory location of the end of the buffer (technically, the
+ * first byte after the buffer). */
+ const char* GetEnd() { return mBuf + mLength; }
+
+ /* Extend the buffer over the content of the other buffer, assuming it is
+ * adjacent. */
+ void Extend(Buffer aOther) {
+ MOZ_ASSERT(aOther.mBuf == GetEnd());
+ mLength += aOther.mLength;
+ }
+
+ private:
+ const char* mBuf;
+ size_t mLength;
+};
+
+/* Helper class to read from a file descriptor line by line. */
+class FdReader {
+ public:
+ explicit FdReader(int aFd)
+ : mFd(aFd), mData(&mRawBuf, 0), mBuf(&mRawBuf, sizeof(mRawBuf)) {}
+
+ /* Read a line from the file descriptor and returns it as a Buffer instance */
+ Buffer ReadLine() {
+ while (true) {
+ Buffer result = mData.SplitChar('\n');
+
+ /* There are essentially three different cases here:
+ * - '\n' was found "early". In this case, the end of the result buffer
+ * is before the beginning of the mData buffer (since SplitChar
+ * amputated it).
+ * - '\n' was found as the last character of mData. In this case, mData
+ * is empty, but still points at the end of mBuf. result points to what
+ * used to be in mData, without the last character.
+ * - '\n' was not found. In this case too, mData is empty and points at
+ * the end of mBuf. But result points to the entire buffer that used to
+ * be pointed by mData.
+ * Only in the latter case do both result and mData's end match, and it's
+ * the only case where we need to refill the buffer.
+ */
+ if (result.GetEnd() != mData.GetEnd()) {
+ return result;
+ }
+
+ /* Since SplitChar emptied mData, make it point to what it had before. */
+ mData = result;
+
+ /* And move it to the beginning of the read buffer. */
+ mData.Slide(mBuf);
+
+ FillBuffer();
+
+ if (!mData) {
+ return Buffer();
+ }
+ }
+ }
+
+ private:
+ /* Fill the read buffer. */
+ void FillBuffer() {
+ size_t size = mBuf.GetEnd() - mData.GetEnd();
+ Buffer remainder(mData.GetEnd(), size);
+
+ ssize_t len = 1;
+ while (remainder && len > 0) {
+ len = ::read(mFd, const_cast<char*>(remainder.get()), size);
+ if (len < 0) {
+ die("Read error");
+ }
+ size -= len;
+ mData.Extend(remainder.Split(len));
+ }
+ }
+
+ /* File descriptor to read from. */
+ int mFd;
+ /* Part of data that was read from the file descriptor but not returned with
+ * ReadLine yet. */
+ Buffer mData;
+ /* Buffer representation of mRawBuf */
+ Buffer mBuf;
+ /* read() buffer */
+ char mRawBuf[4096];
+};
+
+MOZ_BEGIN_EXTERN_C
+
+/* Function declarations for all the replace_malloc _impl functions.
+ * See memory/build/replace_malloc.c */
+#define MALLOC_DECL(name, return_type, ...) \
+ return_type name##_impl(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_MALLOC
+#include "malloc_decls.h"
+
+#define MALLOC_DECL(name, return_type, ...) return_type name(__VA_ARGS__);
+#define MALLOC_FUNCS MALLOC_FUNCS_JEMALLOC
+#include "malloc_decls.h"
+
+#ifdef ANDROID
+
+/* mozjemalloc and jemalloc use pthread_atfork, which Android doesn't have.
+ * While gecko has one in libmozglue, the replay program can't use that.
+ * Since we're not going to fork anyways, make it a dummy function. */
+int pthread_atfork(void (*aPrepare)(void), void (*aParent)(void),
+ void (*aChild)(void)) {
+ return 0;
+}
+#endif
+
+MOZ_END_EXTERN_C
+
+size_t parseNumber(Buffer aBuf) {
+ if (!aBuf) {
+ die("Malformed input");
+ }
+
+ size_t result = 0;
+ for (const char *c = aBuf.get(), *end = aBuf.GetEnd(); c < end; c++) {
+ if (*c < '0' || *c > '9') {
+ die("Malformed input");
+ }
+ result *= 10;
+ result += *c - '0';
+ }
+ return result;
+}
+
+/* Class to handle dispatching the replay function calls to replace-malloc. */
+class Replay {
+ public:
+ Replay()
+ : mOps(0),
+ mNumUsedSlots(0),
+ mTotalRequestedSize(0),
+ mTotalAllocatedSize(0),
+ mCalculateSlop(false) {
+#ifdef _WIN32
+ // See comment in FdPrintf.h as to why native win32 handles are used.
+ mStdErr = reinterpret_cast<intptr_t>(GetStdHandle(STD_ERROR_HANDLE));
+#else
+ mStdErr = fileno(stderr);
+#endif
+ }
+
+ void enableSlopCalculation() { mCalculateSlop = true; }
+
+ MemSlot& operator[](size_t index) const { return mSlots[index]; }
+
+ void malloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::malloc_impl(size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void posix_memalign(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ void* ptr;
+ if (::posix_memalign_impl(&ptr, alignment, size) == 0) {
+ aSlot.mPtr = ptr;
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ } else {
+ aSlot.mPtr = nullptr;
+ }
+ }
+
+ void aligned_alloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::aligned_alloc_impl(alignment, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void calloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t num = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::calloc_impl(num, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = num * size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += num * size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void realloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ Buffer dummy = aArgs.SplitChar('#');
+ if (dummy) {
+ die("Malformed input");
+ }
+ size_t slot_id = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ MemSlot& old_slot = (*this)[slot_id];
+ void* old_ptr = old_slot.mPtr;
+ old_slot.mPtr = nullptr;
+ aSlot.mPtr = ::realloc_impl(old_ptr, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void free(Buffer& aArgs, Buffer& aResult) {
+ if (aResult) {
+ die("Malformed input");
+ }
+ mOps++;
+ Buffer dummy = aArgs.SplitChar('#');
+ if (dummy) {
+ die("Malformed input");
+ }
+ size_t slot_id = parseNumber(aArgs);
+ MemSlot& slot = (*this)[slot_id];
+ ::free_impl(slot.mPtr);
+ slot.mPtr = nullptr;
+ }
+
+ void memalign(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t alignment = parseNumber(aArgs.SplitChar(','));
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::memalign_impl(alignment, size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void valloc(Buffer& aArgs, Buffer& aResult) {
+ MemSlot& aSlot = SlotForResult(aResult);
+ mOps++;
+ size_t size = parseNumber(aArgs);
+ aSlot.mPtr = ::valloc_impl(size);
+ if (aSlot.mPtr) {
+ aSlot.mRequest = size;
+ if (mCalculateSlop) {
+ mTotalRequestedSize += size;
+ mTotalAllocatedSize += ::malloc_usable_size_impl(aSlot.mPtr);
+ }
+ }
+ }
+
+ void jemalloc_stats(Buffer& aArgs, Buffer& aResult) {
+ if (aArgs || aResult) {
+ die("Malformed input");
+ }
+ mOps++;
+ jemalloc_stats_t stats;
+ jemalloc_bin_stats_t bin_stats[JEMALLOC_MAX_STATS_BINS];
+ ::jemalloc_stats_internal(&stats, bin_stats);
+
+ size_t num_objects = 0;
+ size_t num_sloppy_objects = 0;
+ size_t total_allocated = 0;
+ size_t total_slop = 0;
+ size_t large_slop = 0;
+ size_t large_used = 0;
+ size_t huge_slop = 0;
+ size_t huge_used = 0;
+ size_t bin_slop[JEMALLOC_MAX_STATS_BINS] = {0};
+
+ for (size_t slot_id = 0; slot_id < mNumUsedSlots; slot_id++) {
+ MemSlot& slot = mSlots[slot_id];
+ if (slot.mPtr) {
+ size_t used = ::malloc_usable_size_impl(slot.mPtr);
+ size_t slop = used - slot.mRequest;
+ total_allocated += used;
+ total_slop += slop;
+ num_objects++;
+ if (slop) {
+ num_sloppy_objects++;
+ }
+
+ if (used <= stats.page_size / 2) {
+ // We know that this is an inefficient linear search, but there's a
+ // small number of bins and this is simple.
+ for (unsigned i = 0; i < JEMALLOC_MAX_STATS_BINS; i++) {
+ auto& bin = bin_stats[i];
+ if (used == bin.size) {
+ bin_slop[i] += slop;
+ break;
+ }
+ }
+ } else if (used <= stats.large_max) {
+ large_slop += slop;
+ large_used += used;
+ } else {
+ huge_slop += slop;
+ huge_used += used;
+ }
+ }
+ }
+
+ FdPrintf(mStdErr, "\n");
+ FdPrintf(mStdErr, "Objects: %9zu\n", num_objects);
+ FdPrintf(mStdErr, "Slots: %9zu\n", mNumUsedSlots);
+ FdPrintf(mStdErr, "Ops: %9zu\n", mOps);
+ FdPrintf(mStdErr, "mapped: %9zu\n", stats.mapped);
+ FdPrintf(mStdErr, "allocated: %9zu\n", stats.allocated);
+ FdPrintf(mStdErr, "waste: %9zu\n", stats.waste);
+ FdPrintf(mStdErr, "dirty: %9zu\n", stats.page_cache);
+ FdPrintf(mStdErr, "bookkeep: %9zu\n", stats.bookkeeping);
+ FdPrintf(mStdErr, "bin-unused: %9zu\n", stats.bin_unused);
+ FdPrintf(mStdErr, "quantum-max: %9zu\n", stats.quantum_max);
+ FdPrintf(mStdErr, "subpage-max: %9zu\n", stats.page_size / 2);
+ FdPrintf(mStdErr, "large-max: %9zu\n", stats.large_max);
+ if (mCalculateSlop) {
+ size_t slop = mTotalAllocatedSize - mTotalRequestedSize;
+ FdPrintf(mStdErr,
+ "Total slop for all allocations: %zuKiB/%zuKiB (%zu%%)\n",
+ slop / 1024, mTotalAllocatedSize / 1024,
+ percent(slop, mTotalAllocatedSize));
+ }
+ FdPrintf(mStdErr, "Live sloppy objects: %zu/%zu (%zu%%)\n",
+ num_sloppy_objects, num_objects,
+ percent(num_sloppy_objects, num_objects));
+ FdPrintf(mStdErr, "Live sloppy bytes: %zuKiB/%zuKiB (%zu%%)\n",
+ total_slop / 1024, total_allocated / 1024,
+ percent(total_slop, total_allocated));
+
+ FdPrintf(mStdErr, "\n%8s %11s %10s %8s %9s %9s %8s\n", "bin-size",
+ "unused (c)", "total (c)", "used (c)", "non-full (r)", "total (r)",
+ "used (r)");
+ for (auto& bin : bin_stats) {
+ if (bin.size) {
+ FdPrintf(mStdErr, "%8zu %8zuKiB %7zuKiB %7zu%% %12zu %9zu %7zu%%\n",
+ bin.size, bin.bytes_unused / 1024, bin.bytes_total / 1024,
+ percent(bin.bytes_total - bin.bytes_unused, bin.bytes_total),
+ bin.num_non_full_runs, bin.num_runs,
+ percent(bin.num_runs - bin.num_non_full_runs, bin.num_runs));
+ }
+ }
+
+ FdPrintf(mStdErr, "\n%5s %8s %9s %7s\n", "bin", "slop", "used", "percent");
+ for (unsigned i = 0; i < JEMALLOC_MAX_STATS_BINS; i++) {
+ auto& bin = bin_stats[i];
+ if (bin.size) {
+ size_t used = bin.bytes_total - bin.bytes_unused;
+ FdPrintf(mStdErr, "%5zu %8zu %9zu %6zu%%\n", bin.size, bin_slop[i],
+ used, percent(bin_slop[i], used));
+ }
+ }
+ FdPrintf(mStdErr, "%5s %8zu %9zu %6zu%%\n", "large", large_slop, large_used,
+ percent(large_slop, large_used));
+ FdPrintf(mStdErr, "%5s %8zu %9zu %6zu%%\n", "huge", huge_slop, huge_used,
+ percent(huge_slop, huge_used));
+
+ unsigned last_size = 0;
+ for (auto& bin : bin_stats) {
+ if (bin.size == 0) {
+ break;
+ }
+
+ if (bin.size <= 16) {
+ // 1 byte buckets.
+ print_distribution(bin.size, last_size, 1);
+ } else if (bin.size <= stats.quantum_max) {
+ // 4 buckets, (4 bytes per bucket with a 16 byte quantum).
+ print_distribution(bin.size, last_size, stats.quantum / 4);
+ } else {
+ // 16 buckets.
+ print_distribution(bin.size, last_size, (bin.size - last_size) / 16);
+ }
+
+ last_size = bin.size;
+ }
+
+ // 16 buckets.
+ print_distribution(stats.page_size, last_size,
+ (stats.page_size - last_size) / 16);
+
+ // Buckets are 1/4 of the page size (12 buckets).
+ print_distribution(stats.page_size * 4, stats.page_size,
+ stats.page_size / 4);
+
+ /* TODO: Add more data, like actual RSS as measured by OS, but compensated
+ * for the replay internal data. */
+ }
+
+ private:
+ const size_t MAX_NUM_BUCKETS = 16;
+
+ /*
+ * Create and print frequency distributions of memory requests.
+ */
+ void print_distribution(size_t size, size_t next_smallest,
+ size_t bucket_size) {
+ unsigned shift = mozilla::CeilingLog2(bucket_size);
+
+ // The number of slots.
+ const unsigned array_slots = (size - next_smallest) >> shift;
+
+ // The translation to turn a slot index into a memory request size.
+ const unsigned array_offset = 1 + next_smallest;
+ const size_t array_offset_add = (1 << shift) + next_smallest;
+
+ // Avoid a variable length array.
+ MOZ_RELEASE_ASSERT(array_slots <= MAX_NUM_BUCKETS);
+ size_t requests[MAX_NUM_BUCKETS];
+ memset(requests, 0, sizeof(size_t) * array_slots);
+ size_t total_requests = 0;
+
+ for (size_t slot_id = 0; slot_id < mNumUsedSlots; slot_id++) {
+ MemSlot& slot = mSlots[slot_id];
+ if (slot.mPtr && slot.mRequest > next_smallest && slot.mRequest <= size) {
+ requests[(slot.mRequest - array_offset) >> shift]++;
+ total_requests++;
+ }
+ }
+
+ FdPrintf(mStdErr, "\n%zu-bin Distribution:\n", size);
+ FdPrintf(mStdErr, " request : count percent\n");
+ size_t range_start = next_smallest + 1;
+ for (size_t j = 0; j < array_slots; j++) {
+ size_t range_end = (j << shift) + array_offset_add;
+ FdPrintf(mStdErr, "%5zu - %5zu: %6zu %6zu%%\n", range_start, range_end,
+ requests[j], percent(requests[j], total_requests));
+ range_start = range_end + 1;
+ }
+ }
+
+ static size_t percent(size_t a, size_t b) {
+ if (!b) {
+ return 0;
+ }
+ return size_t(round(double(a) / double(b) * 100.0));
+ }
+
+ MemSlot& SlotForResult(Buffer& aResult) {
+ /* Parse result value and get the corresponding slot. */
+ Buffer dummy = aResult.SplitChar('=');
+ Buffer dummy2 = aResult.SplitChar('#');
+ if (dummy || dummy2) {
+ die("Malformed input");
+ }
+
+ size_t slot_id = parseNumber(aResult);
+ mNumUsedSlots = std::max(mNumUsedSlots, slot_id + 1);
+
+ return mSlots[slot_id];
+ }
+
+ intptr_t mStdErr;
+ size_t mOps;
+
+ // The number of slots that have been used. It is used to iterate over slots
+ // without accessing those we haven't initialised.
+ size_t mNumUsedSlots;
+
+ MemSlotList mSlots;
+ size_t mTotalRequestedSize;
+ size_t mTotalAllocatedSize;
+ // Whether to calculate slop for all allocations over the runtime of a
+ // process.
+ bool mCalculateSlop;
+};
+
+int main(int argc, const char* argv[]) {
+ size_t first_pid = 0;
+ FdReader reader(0);
+ Replay replay;
+
+ for (int i = 1; i < argc; i++) {
+ const char* option = argv[i];
+ if (strcmp(option, "-s") == 0) {
+ replay.enableSlopCalculation();
+ } else {
+ fprintf(stderr, "Unknown command line option: %s\n", option);
+ return EXIT_FAILURE;
+ }
+ }
+
+ /* Read log from stdin and dispatch function calls to the Replay instance.
+ * The log format is essentially:
+ * <pid> <tid> <function>([<args>])[=<result>]
+ * <args> is a comma separated list of arguments.
+ *
+ * The logs are expected to be preprocessed so that allocations are
+ * attributed a tracking slot. The input is trusted not to have crazy
+ * values for these slot numbers.
+ *
+ * <result>, as well as some of the args to some of the function calls are
+ * such slot numbers.
+ */
+ while (true) {
+ Buffer line = reader.ReadLine();
+
+ if (!line) {
+ break;
+ }
+
+ size_t pid = parseNumber(line.SplitChar(' '));
+ if (!first_pid) {
+ first_pid = pid;
+ }
+
+ /* The log may contain data for several processes, only entries for the
+ * very first that appears are treated. */
+ if (first_pid != pid) {
+ continue;
+ }
+
+ /* The log contains thread ids for manual analysis, but we just ignore them
+ * for now. */
+ parseNumber(line.SplitChar(' '));
+
+ Buffer func = line.SplitChar('(');
+ Buffer args = line.SplitChar(')');
+
+ if (func == Buffer("jemalloc_stats")) {
+ replay.jemalloc_stats(args, line);
+ } else if (func == Buffer("free")) {
+ replay.free(args, line);
+ } else if (func == Buffer("malloc")) {
+ replay.malloc(args, line);
+ } else if (func == Buffer("posix_memalign")) {
+ replay.posix_memalign(args, line);
+ } else if (func == Buffer("aligned_alloc")) {
+ replay.aligned_alloc(args, line);
+ } else if (func == Buffer("calloc")) {
+ replay.calloc(args, line);
+ } else if (func == Buffer("realloc")) {
+ replay.realloc(args, line);
+ } else if (func == Buffer("memalign")) {
+ replay.memalign(args, line);
+ } else if (func == Buffer("valloc")) {
+ replay.valloc(args, line);
+ } else {
+ die("Malformed input");
+ }
+ }
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2025-01-06 02:25:27 +0000