mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-21 03:53:04 +02:00
551d8a88ab
Incremental LTO will usea cache to store object files. This patch handles the pruning part of the cache, exposing a few knobs: - Pruning interval: the implementation keeps a "timestamp" file in the directory and will scan it only after a given interval since the last modification of the timestamp file. This is for performance purpose, we don't want to scan continuously the folder. - Entry expiration: this is the time after which a file that hasn't been used is remove from the cache. - Maximum size: expressed in percentage of the available disk space, it helps to avoid that we blow up the disk space. http://reviews.llvm.org/D18422 From: Mehdi Amini <mehdi.amini@apple.com> llvm-svn: 265209
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
//=- CachePruning.h - Helper to manage the pruning of a cache dir -*- C++ -*-=//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements pruning of a directory intended for cache storage, using
|
|
// various policies.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_SUPPORT_CACHE_PRUNING_H
|
|
#define LLVM_SUPPORT_CACHE_PRUNING_H
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
|
|
namespace llvm {
|
|
|
|
/// Handle pruning a directory provided a path and some options to control what
|
|
/// to prune.
|
|
class CachePruning {
|
|
public:
|
|
/// Prepare to prune \p Path.
|
|
CachePruning(StringRef Path) : Path(Path) {}
|
|
|
|
/// Define the pruning interval. This is intended to be used to avoid scanning
|
|
/// the directory too often. It does not impact the decision of which file to
|
|
/// prune. A value of 0 forces the scan to occurs.
|
|
CachePruning &setPruningInterval(int PruningInterval) {
|
|
Interval = PruningInterval;
|
|
return *this;
|
|
}
|
|
|
|
/// Define the expiration for a file. When a file hasn't been accessed for
|
|
/// \p ExpireAfter seconds, it is removed from the cache. A value of 0 disable
|
|
/// the expiration-based pruning.
|
|
CachePruning &setEntryExpiration(unsigned ExpireAfter) {
|
|
Expiration = ExpireAfter;
|
|
return *this;
|
|
}
|
|
|
|
/// Define the maximum size for the cache directory, in terms of percentage of
|
|
/// the available space on the the disk. Set to 100 to indicate no limit, 50
|
|
/// to indicate that the cache size will not be left over half the
|
|
/// available disk space. A value over 100 will be reduced to 100. A value of
|
|
/// 0 disable the size-based pruning.
|
|
CachePruning &setMaxSize(unsigned Percentage) {
|
|
PercentageOfAvailableSpace = std::min(100u, Percentage);
|
|
return *this;
|
|
}
|
|
|
|
/// Peform pruning using the supplied options, returns true if pruning
|
|
/// occured, i.e. if PruningInterval was expired.
|
|
bool prune();
|
|
|
|
private:
|
|
// Options that matches the setters above.
|
|
std::string Path;
|
|
unsigned Expiration = 0;
|
|
unsigned Interval = 0;
|
|
unsigned PercentageOfAvailableSpace = 0;
|
|
};
|
|
|
|
} // namespace llvm
|
|
|
|
#endif |