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Implement apis in the Environment to clear out pages in the OS cache.

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Summary:
Added a new api to the Environment that allows clearing out not-needed
pages from the OS cache. This will be helpful when the compressed
block cache replaces the OS cache.

Test Plan: EnvPosixTest.InvalidateCache

Reviewers: haobo

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D13041
This commit is contained in:
Dhruba Borthakur
2013-09-20 23:00:13 -07:00
parent 9262061b0d
commit 87d6eb2f6b
3 changed files with 111 additions and 4 deletions
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23
include/rocksdb/env.h
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@@ -41,7 +41,7 @@ struct EnvOptions {
EnvOptions();
// construct from Options
EnvOptions(const Options& options);
explicit EnvOptions(const Options& options);
// If true, then allow caching of data in environment buffers
bool use_os_buffer;
@@ -253,6 +253,13 @@ class SequentialFile {
//
// REQUIRES: External synchronization
virtual Status Skip(uint64_t n) = 0;
// Remove any kind of caching of data from the offset to offset+length
// of this file. If the length is 0, then it refers to the end of file.
// If the system is not caching the file contents, then this is a noop.
virtual Status InvalidateCache(size_t offset, size_t length) {
return Status::NotSupported("InvalidateCache not supported.");
}
};
// A file abstraction for randomly reading the contents of a file.
@@ -298,6 +305,12 @@ class RandomAccessFile {
virtual void Hint(AccessPattern pattern) {}
// Remove any kind of caching of data from the offset to offset+length
// of this file. If the length is 0, then it refers to the end of file.
// If the system is not caching the file contents, then this is a noop.
virtual Status InvalidateCache(size_t offset, size_t length) {
return Status::NotSupported("InvalidateCache not supported.");
}
};
// A file abstraction for sequential writing. The implementation
@@ -347,6 +360,14 @@ class WritableFile {
*block_size = preallocation_block_size_;
}
// Remove any kind of caching of data from the offset to offset+length
// of this file. If the length is 0, then it refers to the end of file.
// If the system is not caching the file contents, then this is a noop.
// This call has no effect on dirty pages in the cache.
virtual Status InvalidateCache(size_t offset, size_t length) {
return Status::NotSupported("InvalidateCache not supported.");
}
protected:
// PrepareWrite performs any necessary preparation for a write
// before the write actually occurs. This allows for pre-allocation