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49385c8a07
Summary: C++17 Reviewed By: fanzeyi Differential Revision: D28966939 fbshipit-source-id: c8c9d49bc02557263a6acf9357c90b50e04fbdb9
77 lines
1.8 KiB
C++
77 lines
1.8 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This software may be used and distributed according to the terms of the
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* GNU General Public License version 2.
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*/
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#pragma once
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#include <atomic>
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#include <optional>
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#include "eden/fs/store/ObjectFetchContext.h"
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namespace facebook::eden {
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struct FetchStatistics {
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struct Access {
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/**
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* Total number of object accesses, including cache hits.
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*/
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uint64_t accessCount = 0;
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/**
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* Number of object fetches from the backing store.
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*/
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uint64_t fetchCount = 0;
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/**
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* In range [0, 100]. unsigned char is big enough, but prints as a
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* character.
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*/
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unsigned short cacheHitRate = 0;
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};
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Access tree;
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Access blob;
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Access metadata;
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};
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class StatsFetchContext : public ObjectFetchContext {
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public:
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StatsFetchContext() = default;
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StatsFetchContext(
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std::optional<pid_t> pid,
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Cause cause,
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folly::StringPiece causeDetail);
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StatsFetchContext(const StatsFetchContext& other);
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void didFetch(ObjectType type, const Hash& id, Origin origin) override;
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std::optional<pid_t> getClientPid() const override;
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Cause getCause() const override;
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std::optional<folly::StringPiece> getCauseDetail() const override;
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uint64_t countFetchesOfType(ObjectType type) const;
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uint64_t countFetchesOfTypeAndOrigin(ObjectType type, Origin origin) const;
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FetchStatistics computeStatistics() const;
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/**
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* Sums the counts from another fetch context into this one.
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*/
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void merge(const StatsFetchContext& other);
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private:
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std::atomic<uint64_t> counts_[ObjectFetchContext::kObjectTypeEnumMax]
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[ObjectFetchContext::kOriginEnumMax] = {};
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std::optional<pid_t> clientPid_ = std::nullopt;
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Cause cause_ = Cause::Unknown;
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folly::StringPiece causeDetail_;
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};
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} // namespace facebook::eden
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