================
@@ -1125,6 +1125,54 @@ class YAMLVFSWriter {
void write(llvm::raw_ostream &OS);
};
+/// File system that tracks the number of calls to the underlying file system.
+/// This is particularly useful when wrapped around \c RealFileSystem to add
+/// lightweight tracking of expensive syscalls.
+class TracingFileSystem
+ : public llvm::RTTIExtends<TracingFileSystem, ProxyFileSystem> {
+public:
+ static const char ID;
+
+ std::size_t NumStatusCalls = 0;
----------------
jansvoboda11 wrote:
I'm contemplating whether to make these atomic. The root `FileSystem` class
inherits from `ThreadSafeRefCountedBase`, suggesting that VFSs may be
thread-safe.
For example in `clang-scan-deps`, all workers _could_ use single
`RealFileSystem`. If we wrapped that in a single thread-safe
`TracingFileSystem`, we'd very easily get the complete VFS stats. The current
non-thread-safe approach would require having N of these VFS stacks and then
manually aggregating the individual VFS stats.
Thoughts?
https://github.com/llvm/llvm-project/pull/88326
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