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Add debugging to the cache pruning 

From: Mehdi Amini <mehdi.amini@apple.com>
llvm-svn: 266686
This commit is contained in:
Mehdi Amini 2016-04-18 21:54:00 +00:00
parent e9a04ae141
commit 045d4754f5
1 changed files with 23 additions and 4 deletions
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27
llvm/lib/Support/CachePruning.cpp
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@ -13,10 +13,13 @@
#include "llvm/Support/CachePruning.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "cache-pruning"
#include <set>
using namespace llvm;
@ -33,9 +36,11 @@ bool CachePruning::prune() {
SmallString<128> TimestampFile(Path);
sys::path::append(TimestampFile, "llvmcache.timestamp");
if (Expiration == 0 && PercentageOfAvailableSpace == 0)
if (Expiration == 0 && PercentageOfAvailableSpace == 0) {
DEBUG(dbgs() << "No pruning settings set, exit early\n");
// Nothing will be pruned, early exit
return false;
}
// Try to stat() the timestamp file.
sys::fs::file_status FileStatus;
@ -54,8 +59,12 @@ bool CachePruning::prune() {
// If not, do nothing.
sys::TimeValue TimeStampModTime = FileStatus.getLastModificationTime();
auto TimeInterval = sys::TimeValue(sys::TimeValue::SecondsType(Interval));
if (CurrentTime - TimeStampModTime <= TimeInterval)
auto TimeStampAge = CurrentTime - TimeStampModTime;
if (TimeStampAge <= TimeInterval) {
DEBUG(dbgs() << "Timestamp file too recent (" << TimeStampAge.seconds()
<< "s old), do not prune.\n");
return false;
}
}
// Write a new timestamp file so that nobody else attempts to prune.
// There is a benign race condition here, if two processes happen to
@ -93,12 +102,17 @@ bool CachePruning::prune() {
// Look at this file. If we can't stat it, there's nothing interesting
// there.
if (sys::fs::status(File->path(), FileStatus))
if (sys::fs::status(File->path(), FileStatus)) {
DEBUG(dbgs() << "Ignore " << File->path() << " (can't stat)\n");
continue;
}
// If the file hasn't been used recently enough, delete it
sys::TimeValue FileAccessTime = FileStatus.getLastAccessedTime();
if (CurrentTime - FileAccessTime > TimeExpiration) {
auto FileAge = CurrentTime - FileAccessTime;
if (FileAge > TimeExpiration) {
DEBUG(dbgs() << "Remove " << File->path() << " (" << FileAge.seconds()
<< "s old)\n");
sys::fs::remove(File->path());
continue;
}
@ -116,6 +130,8 @@ bool CachePruning::prune() {
sys::fs::space_info SpaceInfo = ErrOrSpaceInfo.get();
auto AvailableSpace = TotalSize + SpaceInfo.free;
auto FileAndSize = FileSizes.rbegin();
DEBUG(dbgs() << "Occupancy: " << ((100 * TotalSize) / AvailableSpace)
<< "% target is: " << PercentageOfAvailableSpace << "\n");
// Remove the oldest accessed files first, till we get below the threshold
while (((100 * TotalSize) / AvailableSpace) > PercentageOfAvailableSpace &&
FileAndSize != FileSizes.rend()) {
@ -123,6 +139,9 @@ bool CachePruning::prune() {
sys::fs::remove(FileAndSize->second);
// Update size
TotalSize -= FileAndSize->first;
DEBUG(dbgs() << " - Remove " << FileAndSize->second << " (size "
<< FileAndSize->first << "), new occupancy is " << TotalSize
<< "%\n");
++FileAndSize;
}
}