1 files changed, 0 insertions, 280 deletions
diff --git a/lib/esan/working_set.cpp b/lib/esan/working_set.cpp
deleted file mode 100644
index e56902c8f..000000000
--- a/lib/esan/working_set.cpp
+++ /dev/null
@@ -1,280 +0,0 @@
-//===-- working_set.cpp ---------------------------------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file is a part of EfficiencySanitizer, a family of performance tuners.
-//
-// This file contains working-set-specific code.
-//===----------------------------------------------------------------------===//
-
-#include "working_set.h"
-#include "esan.h"
-#include "esan_circular_buffer.h"
-#include "esan_flags.h"
-#include "esan_shadow.h"
-#include "esan_sideline.h"
-#include "sanitizer_common/sanitizer_procmaps.h"
-
-// We shadow every cache line of app memory with one shadow byte.
-// - The highest bit of each shadow byte indicates whether the corresponding
-//   cache line has ever been accessed.
-// - The lowest bit of each shadow byte indicates whether the corresponding
-//   cache line was accessed since the last sample.
-// - The other bits are used for working set snapshots at successively
-//   lower frequencies, each bit to the left from the lowest bit stepping
-//   down the frequency by 2 to the power of getFlags()->snapshot_step.
-// Thus we have something like this:
-//   Bit 0: Since last sample
-//   Bit 1: Since last 2^2 samples
-//   Bit 2: Since last 2^4 samples
-//   Bit 3: ...
-//   Bit 7: Ever accessed.
-// We live with races in accessing each shadow byte.
-typedef unsigned char byte;
-
-namespace __esan {
-
-// Our shadow memory assumes that the line size is 64.
-static const u32 CacheLineSize = 64;
-
-// See the shadow byte layout description above.
-static const u32 TotalWorkingSetBitIdx = 7;
-// We accumulate to the left until we hit this bit.
-// We don't need to accumulate to the final bit as it's set on each ref
-// by the compiler instrumentation.
-static const u32 MaxAccumBitIdx = 6;
-static const u32 CurWorkingSetBitIdx = 0;
-static const byte ShadowAccessedVal =
-  (1 << TotalWorkingSetBitIdx) | (1 << CurWorkingSetBitIdx);
-
-static SidelineThread Thread;
-// If we use real-time-based timer samples this won't overflow in any realistic
-// scenario, but if we switch to some other unit (such as memory accesses) we
-// may want to consider a 64-bit int.
-static u32 SnapshotNum;
-
-// We store the wset size for each of 8 different sampling frequencies.
-static const u32 NumFreq = 8; // One for each bit of our shadow bytes.
-// We cannot use static objects as the global destructor is called
-// prior to our finalize routine.
-// These are each circular buffers, sized up front.
-CircularBuffer<u32> SizePerFreq[NumFreq];
-// We cannot rely on static initializers (they may run too late) but
-// we record the size here for clarity:
-u32 CircularBufferSizes[NumFreq] = {
-  // These are each mmap-ed so our minimum is one page.
-  32*1024,
-  16*1024,
-  8*1024,
-  4*1024,
-  4*1024,
-  4*1024,
-  4*1024,
-  4*1024,
-};
-
-void processRangeAccessWorkingSet(uptr PC, uptr Addr, SIZE_T Size,
-                                  bool IsWrite) {
-  if (Size == 0)
-    return;
-  SIZE_T I = 0;
-  uptr LineSize = getFlags()->cache_line_size;
-  // As Addr+Size could overflow at the top of a 32-bit address space,
-  // we avoid the simpler formula that rounds the start and end.
-  SIZE_T NumLines = Size / LineSize +
-    // Add any extra at the start or end adding on an extra line:
-    (LineSize - 1 + Addr % LineSize + Size % LineSize) / LineSize;
-  byte *Shadow = (byte *)appToShadow(Addr);
-  // Write shadow bytes until we're word-aligned.
-  while (I < NumLines && (uptr)Shadow % 4 != 0) {
-    if ((*Shadow & ShadowAccessedVal) != ShadowAccessedVal)
-      *Shadow |= ShadowAccessedVal;
-    ++Shadow;
-    ++I;
-  }
-  // Write whole shadow words at a time.
-  // Using a word-stride loop improves the runtime of a microbenchmark of
-  // memset calls by 10%.
-  u32 WordValue = ShadowAccessedVal | ShadowAccessedVal << 8 |
-    ShadowAccessedVal << 16 | ShadowAccessedVal << 24;
-  while (I + 4 <= NumLines) {
-    if ((*(u32*)Shadow & WordValue) != WordValue)
-      *(u32*)Shadow |= WordValue;
-    Shadow += 4;
-    I += 4;
-  }
-  // Write any trailing shadow bytes.
-  while (I < NumLines) {
-    if ((*Shadow & ShadowAccessedVal) != ShadowAccessedVal)
-      *Shadow |= ShadowAccessedVal;
-    ++Shadow;
-    ++I;
-  }
-}
-
-// This routine will word-align ShadowStart and ShadowEnd prior to scanning.
-// It does *not* clear for BitIdx==TotalWorkingSetBitIdx, as that top bit
-// measures the access during the entire execution and should never be cleared.
-static u32 countAndClearShadowValues(u32 BitIdx, uptr ShadowStart,
-                                     uptr ShadowEnd) {
-  u32 WorkingSetSize = 0;
-  u32 ByteValue = 0x1 << BitIdx;
-  u32 WordValue = ByteValue | ByteValue << 8 | ByteValue << 16 |
-    ByteValue << 24;
-  // Get word aligned start.
-  ShadowStart = RoundDownTo(ShadowStart, sizeof(u32));
-  bool Accum = getFlags()->record_snapshots && BitIdx < MaxAccumBitIdx;
-  // Do not clear the bit that measures access during the entire execution.
-  bool Clear = BitIdx < TotalWorkingSetBitIdx;
-  for (u32 *Ptr = (u32 *)ShadowStart; Ptr < (u32 *)ShadowEnd; ++Ptr) {
-    if ((*Ptr & WordValue) != 0) {
-      byte *BytePtr = (byte *)Ptr;
-      for (u32 j = 0; j < sizeof(u32); ++j) {
-        if (BytePtr[j] & ByteValue) {
-          ++WorkingSetSize;
-          if (Accum) {
-            // Accumulate to the lower-frequency bit to the left.
-            BytePtr[j] |= (ByteValue << 1);
-          }
-        }
-      }
-      if (Clear) {
-        // Clear this bit from every shadow byte.
-        *Ptr &= ~WordValue;
-      }
-    }
-  }
-  return WorkingSetSize;
-}
-
-// Scan shadow memory to calculate the number of cache lines being accessed,
-// i.e., the number of non-zero bits indexed by BitIdx in each shadow byte.
-// We also clear the lowest bits (most recent working set snapshot).
-// We do *not* clear for BitIdx==TotalWorkingSetBitIdx, as that top bit
-// measures the access during the entire execution and should never be cleared.
-static u32 computeWorkingSizeAndReset(u32 BitIdx) {
-  u32 WorkingSetSize = 0;
-  MemoryMappingLayout MemIter(true/*cache*/);
-  MemoryMappedSegment Segment;
-  while (MemIter.Next(&Segment)) {
-    VPrintf(4, "%s: considering %p-%p app=%d shadow=%d prot=%u\n", __FUNCTION__,
-            Segment.start, Segment.end, Segment.protection,
-            isAppMem(Segment.start), isShadowMem(Segment.start));
-    if (isShadowMem(Segment.start) && Segment.IsWritable()) {
-      VPrintf(3, "%s: walking %p-%p\n", __FUNCTION__, Segment.start,
-              Segment.end);
-      WorkingSetSize +=
-          countAndClearShadowValues(BitIdx, Segment.start, Segment.end);
-    }
-  }
-  return WorkingSetSize;
-}
-
-// This is invoked from a signal handler but in a sideline thread doing nothing
-// else so it is a little less fragile than a typical signal handler.
-static void takeSample(void *Arg) {
-  u32 BitIdx = CurWorkingSetBitIdx;
-  u32 Freq = 1;
-  ++SnapshotNum; // Simpler to skip 0 whose mod matches everything.
-  while (BitIdx <= MaxAccumBitIdx && (SnapshotNum % Freq) == 0) {
-    u32 NumLines = computeWorkingSizeAndReset(BitIdx);
-    VReport(1, "%s: snapshot #%5d bit %d freq %4d: %8u\n", SanitizerToolName,
-            SnapshotNum, BitIdx, Freq, NumLines);
-    SizePerFreq[BitIdx].push_back(NumLines);
-    Freq = Freq << getFlags()->snapshot_step;
-    BitIdx++;
-  }
-}
-
-unsigned int getSampleCountWorkingSet()
-{
-  return SnapshotNum;
-}
-
-// Initialization that must be done before any instrumented code is executed.
-void initializeShadowWorkingSet() {
-  CHECK(getFlags()->cache_line_size == CacheLineSize);
-  registerMemoryFaultHandler();
-}
-
-void initializeWorkingSet() {
-  if (getFlags()->record_snapshots) {
-    for (u32 i = 0; i < NumFreq; ++i)
-      SizePerFreq[i].initialize(CircularBufferSizes[i]);
-    Thread.launchThread(takeSample, nullptr, getFlags()->sample_freq);
-  }
-}
-
-static u32 getPeriodForPrinting(u32 MilliSec, const char *&Unit) {
-  if (MilliSec > 600000) {
-    Unit = "min";
-    return MilliSec / 60000;
-  } else if (MilliSec > 10000) {
-    Unit = "sec";
-    return MilliSec / 1000;
-  } else {
-    Unit = "ms";
-    return MilliSec;
-  }
-}
-
-static u32 getSizeForPrinting(u32 NumOfCachelines, const char *&Unit) {
-  // We need a constant to avoid software divide support:
-  static const u32 KilobyteCachelines = (0x1 << 10) / CacheLineSize;
-  static const u32 MegabyteCachelines = KilobyteCachelines << 10;
-
-  if (NumOfCachelines > 10 * MegabyteCachelines) {
-    Unit = "MB";
-    return NumOfCachelines / MegabyteCachelines;
-  } else if (NumOfCachelines > 10 * KilobyteCachelines) {
-    Unit = "KB";
-    return NumOfCachelines / KilobyteCachelines;
-  } else {
-    Unit = "Bytes";
-    return NumOfCachelines * CacheLineSize;
-  }
-}
-
-void reportWorkingSet() {
-  const char *Unit;
-  if (getFlags()->record_snapshots) {
-    u32 Freq = 1;
-    Report(" Total number of samples: %u\n", SnapshotNum);
-    for (u32 i = 0; i < NumFreq; ++i) {
-      u32 Time = getPeriodForPrinting(getFlags()->sample_freq*Freq, Unit);
-      Report(" Samples array #%d at period %u %s\n", i, Time, Unit);
-      // FIXME: report whether we wrapped around and thus whether we
-      // have data on the whole run or just the last N samples.
-      for (u32 j = 0; j < SizePerFreq[i].size(); ++j) {
-        u32 Size = getSizeForPrinting(SizePerFreq[i][j], Unit);
-        Report("#%4d: %8u %s (%9u cache lines)\n", j, Size, Unit,
-               SizePerFreq[i][j]);
-      }
-      Freq = Freq << getFlags()->snapshot_step;
-    }
-  }
-
-  // Get the working set size for the entire execution.
-  u32 NumOfCachelines = computeWorkingSizeAndReset(TotalWorkingSetBitIdx);
-  u32 Size = getSizeForPrinting(NumOfCachelines, Unit);
-  Report(" %s: the total working set size: %u %s (%u cache lines)\n",
-         SanitizerToolName, Size, Unit, NumOfCachelines);
-}
-
-int finalizeWorkingSet() {
-  if (getFlags()->record_snapshots)
-    Thread.joinThread();
-  reportWorkingSet();
-  if (getFlags()->record_snapshots) {
-    for (u32 i = 0; i < NumFreq; ++i)
-      SizePerFreq[i].free();
-  }
-  return 0;
-}
-
-} // namespace __esan